Mittel28 / 100Konfidenz: Mittel

CVSS10.0EPSS0.5 %Über Netz erreichbarOhne AnmeldungOhne Zutun des Nutzers

Es wird dringend empfohlen, alle Linux-Systeme umgehend mit den neuesten Kernel-Patches zu aktualisieren.

▸Herleitung der Bewertung(2)

Wie der Wert zustande kommt

Hoechster CVSS-Basiswert 10.0+18
Ohne Anmeldung ueber das Netz ausnutzbar (CVE-2026-74581, CVSS-Vektor AV:N/PR:N)+10

Woraus sich die Konfidenz ergibt

Nur ein Herausgeber — keine Gegenlesung
Darunter eine behoerdliche Primaerquelle
Strukturierte CVE-Daten aus der NVD vorhanden

Die Konfidenz misst die Belegqualität, nicht die Schwere.

Einschränkungen

Schmale Datenlage: der Wert beruht auf wenigen Einzelsignalen.
Fuer 51 erkannte CVE(s) liegt noch kein CVSS-Basiswert vor (NVD-Rueckstau).

Bewertung v1.2, deterministisch berechnet. Bedrohungswert und Konfidenz sind getrennte Größen.· 2026-08-24 11:21 UTCMethodik

[NEU] [mittel] Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

CERT-Bund·24. August 2026, 11:21

Originalartikel lesen bei CERT-Bund

Mehrere Schwachstellen im Linux Kernel ermöglichen Angreifern, nicht spezifizierte Angriffe durchzuführen. Betroffen sind alle Nutzer von Linux-Systemen, die diese Schwachstellen aufweisen. Es wird dringend empfohlen, die Systeme umgehend zu patchen, um Sicherheitsrisiken zu minimieren.

SecBoard-Einordnung

Diese Schwachstellen könnten es Angreifern ermöglichen, Sicherheitsmaßnahmen zu umgehen, Denial-of-Service-Angriffe durchzuführen oder sensible Informationen preiszugeben. Dies stellt ein erhebliches Risiko für die Integrität und Vertraulichkeit von Linux-basierten Systemen dar.

Realistisch schlimmster Fall: Ein Angreifer könnte die Kontrolle über ein betroffenes System erlangen, sensible Daten exfiltrieren oder das System unbrauchbar machen, was zu Betriebsunterbrechungen und Datenverlust führen kann.

Key Facts· 12 / 154

Nach Dringlichkeit sortiert: KEV-Eintrag, dann CVSS, dann EPSS. Vollstaendige Liste im Meldungstext.

CVE-2026-74705

CVSS: 10.0 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74612

CVSS: 10.0 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74597

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74662

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74669

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74616

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74730

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74586

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74587

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74588

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74628

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

CVE-2026-74688

CVSS: 9.8 · CRITICAL
EPSS: 0.5%
Über das Netz: ja
Anmeldung nötig: nein
Nutzerinteraktion nötig: nein
Angriffskomplexität: niedrig
Beeinträchtigt: Vertraulichkeit, Integrität, Verfügbarkeit
Patch: unbekannt

Betroffen

Alle Nutzer von Linux-Systemen, die die betroffenen Kernel-Schwachstellen aufweisen.

Prüfen

▸Überprüfen Sie die installierte Linux-Kernel-Version auf allen Systemen und vergleichen Sie diese mit den Herstellerangaben zu bekannten Schwachstellen.
▸Stellen Sie sicher, dass ein Patch-Management-Prozess für Linux-Systeme etabliert ist und regelmäßig ausgeführt wird.

▸ 1 weitere

▸Überwachen Sie Systemprotokolle auf ungewöhnliche Aktivitäten oder Abstürze, die auf eine Ausnutzung der Schwachstellen hindeuten könnten.

Offene Punkte

▸ anzeigen

▸Spezifische CVE-IDs der Schwachstellen sind nicht im Artikel genannt.
▸Die genauen Angriffsmethoden und die erforderlichen Berechtigungen für die Ausnutzung sind nicht spezifiziert.
▸Die genauen betroffenen Linux-Kernel-Versionen oder Distributionen sind nicht aufgeführt.

Red-Team-Relevanz

Was heißt das für dein nächstes Assessment?

▸ Einordnung anzeigen

Initial Access möglich?Unklar
Privilege Escalation relevant?Unklar
Exploit öffentlich verfügbar?Möglich
Detection / Logging prüfbar?Möglich
Für Purple-Team-Szenario geeignet?Unklar

Kundenfragen

Haben wir Oracle extern erreichbar?

MITRE ATT&CK(3)

Techniken aus allen Quellen zusammengeführt — nach Stärke des Belegs sortiert.

T1499Denial of Servicezugeordnet

„causing denial-of-service“

T1530Data from Local Systemzugeordnet

„disclosing sensitive information“

T1562Impair Defenseszugeordnet

„potentially bypassing security measures“

Mehrere Herkünfte bei derselben Technik heißt: mehrere unabhängige Wege führen dorthin.

Quellen & Belege· 1 Quelle

CERT-BundPrimärbelegPUBLICZuverlässigkeit Adiese Meldung

Behoerdliche Veroeffentlichung mit Amtspflicht zur Richtigkeit, frei zugaenglich.

Nur eine Quelle — der Sachverhalt ist an keiner zweiten Stelle gegengelesen.

Verknüpfte Intelligence

Dieselben Entitäten an anderer Stelle auf SecBoard.

Themen

mittel

Vollständigen Artikel lesen bei CERT-Bund

Erwähnte CVEs (12)

CVE-2026-74705CRITICAL(10.0)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-after-free in tunnel segmentation __skb_udp_tunnel_segment() gets the UDP header before ensuring the tunnel header is in the skb head. If the pull reallocates skb->head, the saved UDP header pointer is no longer valid. Get the UDP header after the pull to avoid a potential use-after-free.

Details NVD

CVE-2026-74612CRITICAL(10.0)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: veth: fix skb length accounting after XDP frag adjustment veth exposes non-linear skb fragments through an xdp_buff. If an XDP program adjusts the fragment area, veth_xdp_rcv_skb() copies xdp_frags_size back to skb->data_len but leaves skb->len containing the old fragment contribution. After a fragment shrink, this makes skb_headlen() larger than the actual linear area. In the reproduced UDP receive path, __skb_datagram_iter() copied 1024 bytes past the actual linear tail to userspace, starting at struct skb_shared_info. The copied bytes included the affected skb's nr_frags, xdp_frags_size, and a kernel pointer from skb_shinfo(skb)->frags[0]. Real packet data was displaced by the same amount and truncated at the end. Subtract the old data_len before replacing it and add the new data_len afterwards, keeping skb->len and skb->data_len synchronized. Additionally, bpf_xdp_pull_data() can advance data_end while leaving frags present. The skb is then still non-linear, so the old __skb_put(skb, off) triggers SKB_LINEAR_ASSERT(). Use skb_set_tail_pointer() and update skb->len explicitly instead, following bpf_prog_run_generic_xdp(). Unlike __skb_put(), skb_set_tail_pointer() does not require a linear skb. A 60000-byte UDP datagram on a veth pair with MTU 64000 was shortened by 1024 bytes from its fragment area. Before the fix, all 10 runs produced corrupted payloads. After the fix, all 10 runs matched the expected payload exactly. A forced-tailroom reproducer also exercises bpf_xdp_pull_data() with frags still present; the old code triggers SKB_LINEAR_ASSERT(), while this fix passes 10/10 runs.

Details NVD

CVE-2026-74597CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: ip6_tunnel: clear skb2->cb[] in ip6ip6_err() ip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the quoted inner IPv6 packet, and then passes the clone to icmpv6_send(). The clone still carries the outer packet's inet6_skb_parm in skb->cb. If the outer packet had a Home Address Option, IP6CB(skb2)->dsthao remains non-zero after skb_pull(). icmpv6_send() later calls mip6_addr_swap(), which uses that stale dsthao offset against the quoted inner packet. A malformed inner destination-options header can then make the HAO lookup and address swap run past the end of the quoted packet and corrupt skb_shared_info. Clear skb2->cb[] before pulling the quoted inner IPv6 packet so the reply path does not reuse metadata left by the outer IPv6 stack.

Details NVD

CVE-2026-74662CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: inet: frags: publish queues before arming timer inet_frag_create() arms the fragment queue timer before inserting the queue into the fqdir rhashtable. If the namespace fragment timeout is zero or negative, the timer can run before the queue is published. The timer callback then marks the queue complete, tries to remove a node that is not in the hash table yet, and drops the anticipated hash reference. Creation can subsequently publish the completed queue without restoring that reference, leaving a stale hash node after the caller drops the remaining reference. Publish the queue first and arm the timer while holding the queue lock. This makes timer expiry wait until the queue is visible in the hash table, so inet_frag_kill() can remove the node and balance the hash reference.

Details NVD

CVE-2026-74669CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options after rebasing tunnel ICMP errors ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the quoted original request before passing it to icmp_send(). However, IPCB(skb)->opt still describes the outer IPv4 header. A timestamp option in the outer header can therefore leave an offset that points into the quoted transport header after the rebase. __ip_options_echo() treats a byte at that stale location as the option length and copies it into the fixed-size option storage on the __icmp_send() stack, causing a stack out-of-bounds write. Clear the stale option metadata after resetting the network header. Keep the remaining control block fields, including the ingress interface used by the ICMP response path.

Details NVD

CVE-2026-74616CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: xdp: reject clones that overrun skb_shared_info tailroom xdpf_clone() clones broadcast copies into a single page and sets frame_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that page like a normal XDP frame and expects the usual skb_shared_info tailroom at the end of the buffer. The current check only rejects frames whose linear xdp_frame header, headroom, and packet data exceed PAGE_SIZE. A source frame backed by a larger allocation can still satisfy that check while extending into the clone's required shared-info area. When such a clone is converted back into an skb, build_skb_around() places skb_shared_info over live packet bytes and later writes can corrupt XDP return metadata. Reject clones unless their linear area fits inside SKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already enforced by the XDP-to-skb conversion path.

Details NVD

CVE-2026-74730CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: NFS: Pin the 'struct nfs_server' during a FREE_STATEID call Dan Aloni reports that he was able to hit a use-after-free bug if a FREE_STATEID operation gets delayed for whatever reason. Fix this by bumping the refcount of the 'struct nfs_server' object for the duration of the FREE_STATEID so it doesn't get cleaned up from underneath us while operations are still in flight.

Details NVD

CVE-2026-74586CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: sctp: clear new_transport when removing a peer sctp_process_asconf_param() stores a newly added peer transport in asoc->new_transport. After all parameters in the ASCONF chunk have been processed, sctp_sf_do_asconf() uses this pointer to send a HEARTBEAT to the new transport. An authenticated ASCONF from a remote SCTP peer can add a transport and remove it again with a wildcard DEL-IP parameter in the same chunk. The wildcard deletion preserves the transport on which the ASCONF arrived, but removes the newly added transport through sctp_assoc_del_nonprimary_peers(). The removal does not clear asoc->new_transport, leaving it pointing to the removed transport. sctp_sf_do_asconf() then creates a HEARTBEAT whose chunk->transport points to the removed transport without holding a transport reference. During local address replacement, src_out_of_asoc_ok keeps this HEARTBEAT on control_chunk_list. After the transport is freed by RCU, a successful ASCONF_ACK for the replacement address releases the queued HEARTBEAT and sctp_outq_select_transport() reads the freed transport's state. The issue was found during a static audit of SCTP objects. With an authenticated peer, the reproducer triggered the same KASAN report in 2 of 2 unpatched runs on a KASAN-enabled netdev/main kernel: BUG: KASAN: slab-use-after-free in sctp_outq_select_transport Read of size 4 at addr ffff88800b9bd95c by task python3/197 Call Trace: sctp_outq_select_transport+0x549/0x8b0 [sctp] sctp_outq_flush+0x306/0x2c60 [sctp] sctp_transport_immediate_rtx+0xaf/0x260 [sctp] sctp_process_asconf_ack+0xa48/0xf70 [sctp] Allocated by task 197: sctp_transport_new+0x68/0x650 [sctp] sctp_assoc_add_peer+0x258/0x12a0 [sctp] sctp_process_asconf+0x5e9/0x1090 [sctp] Last potentially related work creation: __call_rcu_common.constprop.0+0x77/0xb70 sctp_assoc_del_nonprimary_peers+0x7c/0xd0 [sctp] sctp_process_asconf+0xd9c/0x1090 [sctp] The first invalid access was a four-byte read of transport->state at net/sctp/outqueue.c:833. The same reproducer completed the full authenticated ASCONF and local-address replacement sequence with this change without a KASAN report or oops. Clear new_transport when its peer is removed, before it can be used to create the HEARTBEAT.

Details NVD

CVE-2026-74587CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: sctp: fix use-after-free of cached ASCONF chunk addip_last_asconf caches the outstanding outbound ASCONF chunk. The normal ASCONF-ACK completion path releases the chunk and clears the pointer. However, sctp_asconf_queue_teardown() releases the cached chunk without clearing addip_last_asconf. During peer restart handling, sctp_sf_do_dupcook_a() queues SCTP_CMD_PURGE_ASCONF_QUEUE, which invokes sctp_asconf_queue_teardown() while the association remains alive and leaves the pointer dangling. A delayed authenticated ASCONF-ACK can then reach sctp_sf_do_asconf_ack(), which accesses the stale chunk and passes it to sctp_process_asconf_ack(), causing a use-after-free and a second release. Clearing the pointer exposes a race with T4 expiry. Peer restart handling queues the timer stop before the purge, but SCTP_CMD_TIMER_STOP uses timer_delete(), which does not wait for a callback already running on another CPU. Such a callback can reach sctp_sf_t4_timer_expire() after the purge and dereference NULL. Clear addip_last_asconf after releasing the cached chunk, and make sctp_sf_t4_timer_expire() consume a stale T4 expiry if no outstanding ASCONF remains.

Details NVD

CVE-2026-74588CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: sctp: keep chunk->transport in step with the list it is queued on __sctp_outq_flush_rtx() moves a gap-acked chunk onto another transport's transmitted list without updating chunk->transport: if (chunk->tsn_gap_acked) { list_move_tail(&chunk->transmitted_list, &transport->transmitted); continue; } The chunk then sits on a live transport's list while chunk->transport still names a different one. If that transport is removed - sctp_assoc_rm_peer() from an ASCONF Delete-IP - sctp_transport_free() RCU-frees it and the chunk is left with a dangling pointer. sctp_assoc_rm_peer() scrubs peer->transmitted and asoc->outqueue.out_chunk_list, but the chunk is on neither. The pointer is not followed while tsn_gap_acked is set. A SACK that reneges on the TSN clears the flag, and the next SACK reaches tchunk->transport->flight_size -= sctp_data_size(tchunk); inside the freed transport. KASAN reports a slab-use-after-free read in sctp_check_transmitted(), freed from sctp_assoc_rm_peer(). Both the removal and the SACKs come from the association peer. Set chunk->transport at the move. The ordinary resend path needs nothing: it reaches its list_move_tail() only after sctp_packet_append_chunk() returned SCTP_XMIT_OK, and __sctp_packet_append_chunk() has rebound the chunk by then. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Details NVD

CVE-2026-74628CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: net/x25: fix use-after-free of the socket by its timers The x25 timers are armed with mod_timer() and cancelled with timer_delete(), so a pending timer holds no reference on the socket and a cancel does not wait for a callback already running on another CPU. x25_heartbeat_expiry() also rearms unconditionally, so it can reinstall sk->sk_timer after __x25_destroy_socket() has passed its cancel point. The following __sock_put() frees the socket while the timer is still queued, and the next expiry uses freed memory. KASAN reports a slab-use-after-free on the kmalloc-2k object freed by close(). timer_delete_sync() cannot be used here: x25_heartbeat_expiry() and x25_timer_expiry() both reach the cancels from inside the timer they would wait on, through __x25_destroy_socket() and x25_disconnect(). Arm the timers with sk_reset_timer() and cancel them with sk_stop_timer() so that an armed timer owns a reference, and release it in both expiry handlers. Rearm the heartbeat only while sk_hashed(sk) is still true, since __x25_destroy_socket() unlinks the socket before dropping it. Arm the deferred destroy timer the same way and drop its reference in x25_destroy_timer(). Reproduced on net with KASAN, with the heartbeat period shortened so the window recurs. With this patch the reproducer no longer triggers a report and /proc/net/x25 drains. Discovered by XBOW, triaged by Baul Lee <baul.lee@xbow.com>

Details NVD

CVE-2026-74688CRITICAL(9.8)

EPSS 0.5%

In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk transport if it is being removed sctp_make_heartbeat_ack() caches the destination transport in chunk->transport without taking a reference. When src_out_of_asoc_ok is enabled, the HEARTBEAT ACK may remain queued on control_chunk_list instead of being transmitted immediately. If the peer transport is removed while the chunk is still queued, sctp_assoc_rm_peer() drops the transport and schedules it for RCU freeing, but only clears cached transport pointers in out_chunk_list. The queued control chunk therefore retains a dangling transport pointer. Once an ASCONF_ACK clears the suppression and the queued control chunk is transmitted, SCTP dereferences the stale transport pointer, leading to a use-after-free. Fix this by also clearing chunk->transport for queued control chunks in control_chunk_list when removing the transport.

Details NVD