tipc: avoid use-after-free in poll trace queue dumps
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74490
- 2026-10-03 Alias added: GHSA-5445-w6x8-6hfq
- 2026-10-08 EPSS moved to the 50th–90th percentile
- 2026-10-13 EPSS moved to the below the 50th percentile
- 2026-10-18 CISA SSVC decision points changed
- 2026-10-18 Priority changed: LOW → MEDIUM
References
Other 8
- https://git.kernel.org/stable/c/3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8
- https://git.kernel.org/stable/c/ae7fc824970888b4fdaa076819c9a6f2fcede275
- https://git.kernel.org/stable/c/78706367fe1b98aee0a6de27c62b7f1e3035f38d
- https://git.kernel.org/stable/c/d7940bb6a8e7ab28f972c2875cb05783216312dc
- https://git.kernel.org/stable/c/5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d
- https://git.kernel.org/stable/c/bed792737b5f1ba773054dbe984502958bdfe6ce
- https://git.kernel.org/stable/c/ac2f787980fdf4364cd5651a4c8128e59b8de3aa
- https://git.kernel.org/stable/c/b4f1719dfea023220e0e6bd892b087d76b2a6a49
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Sources
- CVE-2026-74490 · CVE Program
- CVE-2026-74490 · NVD
- FIRST EPSS
- GHSA-5445-w6x8-6hfq · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74490 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences