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BELL-CVE-2026-98289

2026-10-09T10:00:37.353334+00:00

Affected: Alpaquita:23: linux-lts, Alpaquita:25: linux-lts, Alpaquita:stream: linux-lts

EUVD-2026-383401

2026-10-09T10:00:37.353389+00:00

EUVD-2026-383401

fkie_cve-2026-98289

2026-10-09T10:00:37.353404+00:00

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.…

GHSA-3rq9-mjhw-q3g6

2026-10-09T10:00:37.353459+00:00

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.…

msrc_CVE-2026-98289 — af_unix: Unify scc_index when finalising SCC in __unix_walk_scc().

2026-10-09T10:00:37.353499+00:00

msrc_CVE-2026-98289

UBUNTU-CVE-2026-98289

2026-10-09T10:00:37.353518+00:00

Affected: Ubuntu:16.04:LTS: linux-hwe-edge, Ubuntu:18.04:LTS: linux-aws-5.0, Ubuntu:18.04:LTS: linux-aws-5.3, Ubuntu:18.04:LTS: linux-azure, Ubuntu:18.04:LTS: linux-azure-5.3, Ubuntu:18.04:LTS: linux-azure-edge, Ubuntu:18.04:LTS: linux-gcp, Ubuntu:18.04:LTS: linux-gcp-5.3, Ubuntu:18.04:LTS: linux-gke-4.15, Ubuntu:18.04:LTS: linux-gke-5.4 and 154 more

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_…