CVE-2026-74490: tipc: avoid use-after-free in poll trace queue dumps
Vulnerability summary
CVE-2026-74490 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 39.6% of scored vulnerabilities.
Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 21 · Related 18Timeline
- 15-08-2026PublishedVulnerability first disclosed.
- 16-10-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.46%
Chance of exploitation in the next 30 days
Percentile
40%
Versus all other CVEs
30-day change
Decrease -0.20 pp
From 0.66% on 06-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu165 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 7.0.0-42.42
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 7.0.0-1016.17
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.8-1
- linux-6.12< 6.12.107-1~deb12u1
Linux1 product
- linux≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < 3cd57c6b210d50fd1f7ac1720442ba5be5dc94f8 | ≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < ae7fc824970888b4fdaa076819c9a6f2fcede275 | ≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < 78706367fe1b98aee0a6de27c62b7f1e3035f38d | ≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < d7940bb6a8e7ab28f972c2875cb05783216312dc | ≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < 5e82beba4bc1f91d0e64c9c43f2b2fa9cd1c2a7d | ≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < bed792737b5f1ba773054dbe984502958bdfe6ce | ≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < ac2f787980fdf4364cd5651a4c8128e59b8de3aa | ≥ b4b9771bcbbd5839b0f77aba55e2f85989ed6779, < b4f1719dfea023220e0e6bd892b087d76b2a6a49 | 5.0
3 vendors · 168 products
