Missing Release of Resource after Effective Lifetime Affecting perf package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-CENTOS10-PERF-20709625
- published10 Oct 2026
- disclosed6 Oct 2026
Introduced: 6 Oct 2026
NewCVE-2026-98289 (opens in a new tab)How to fix?
There is no fixed version for Centos:10 perf.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by Centos.
See How to fix? for Centos:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
af_unix: Unify scc_index when finalising SCC in __unix_walk_scc().
Commit bfdb01283ee8 ("af_unix: Assign a unique index to SCC.") changed Tarjan's algorithm to update lowlink with lowlink, which is called lowpoint (unix_vertex.scc_index).
unix_vertex_dead() assumes all vertices in an SCC share the same lowpoint, but this is not always true if an SCC has two or more back edges, depending on the order of DFS.
For example, the graph below has two back edges from B to A and from C to B.
A --> B --> C
^ | ^ |
----' ----'
If DFS walks through A -> B -> C -> B (-> C -> B) -> A (-> B -> A), each index and scc_index will be updated as follows.
A --> B --> C C = (3, 3) (index, scc_index) B = (2, 2) A = (1, 1)
A ... B ... C C = (3, 2)<-. ^ | B = (2, 2) -' `----' A = (1, 1)
A ... B ... C C = (3, 2) ^ | . . B = (2, 1)<-. `----' .... A = (1, 1) -'
Then, unix_vertex_dead() thinks that B is passed to another SCC with scc_index 2, and the SCC is not garbage-collected.
This does not happen if DFS walks in a different order below or starts from B.
1 3
A --> B --> C
^ | ^ |
----' ----'
2 4
Let's unify scc_index across the SCC when finalising it.
Note that updating v->index was previously done in unix_scc_dead(), when called from __unix_walk_scc(), just to save one loop. Since __unix_walk_scc() now iterates over the SCC anyway, the update is moved back to __unix_walk_scc() and 'fast' argument is dropped.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2546528
- https://access.redhat.com/security/cve/CVE-2026-98289
- https://git.kernel.org/stable/c/4a4263dfeabad72f95e8ab6e15146861fa4144dd
- https://git.kernel.org/stable/c/b8f71d69380a5fbc734c868acbeb560f1de1766f
- https://git.kernel.org/stable/c/be550ee108ad80828aa61280400bedfc7e7c39d3