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CVE-2026-74490

HIGHCVSS 8.8/10EPSS 0.40%

Last modified

CVE-2026-74490 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. Other queue dump trace callsites keep their existing output under the locking they already provide, while poll still emits the event itself without walking live queue members from an unlocked context.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.40%

33.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < 3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8; >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < ae7fc824970888b4fdaa076819c9a6f2fcede275; >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < 78706367fe1b98aee0a6de27c62b7f1e3035f38d; >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < d7940bb6a8e7ab28f972c2875cb05783216312dc; >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < 5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d; >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < bed792737b5f1ba773054dbe984502958bdfe6ce; >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < ac2f787980fdf4364cd5651a4c8128e59b8de3aa; >= b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < b4f1719dfea023220e0e6bd892b087d76b2a6a49
LinuxLinux5.0

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74490?
In the Linux kernel, the following vulnerability has been resolved: tipc: avoid use-after-free in poll trace queue dumps TIPC socket tracepoints dump queue state through tipc_sk_dump(). Most queue-dump callsites already serialize that walk under the socket lock or sk->sk_lock.slock, but tipc_poll() calls trace_tipc_sk_poll(..., TIPC_DUMP_ALL, ...) without holding either lock. That lets the poll trace path reach tipc_list_dump() and backlog head/tail dumping while another context dequeues and frees an skb, leaving the trace helper dereferencing a stale queue entry. Stop the unlocked poll trace site from requesting queue dumps. Other queue dump trace callsites keep their existing output under the locking they already provide, while poll still emits the event itself without walking live queue members from an unlocked context.
How severe is CVE-2026-74490?
CVE-2026-74490 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74490?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST