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Description

In the Linux kernel, the following vulnerability has been resolved: tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer The reproduction steps: 1. create a tun interface 2. enable l2 bearer 3. TIPC_NL_UDP_GET_REMOTEIP with media name set to tun tipc: Started in network mode tipc: Node identity 8af312d38a21, cluster identity 4711 tipc: Enabled bearer <eth:syz_tun>, priority 1 Oops: general protection fault KASAN: null-ptr-deref in range CPU: 1 UID: 1000 PID: 559 Comm: poc Not tainted 6.16.0-rc1+ #117 PREEMPT Hardware name: QEMU Ubuntu 24.04 PC RIP: 0010:tipc_udp_nl_dump_remoteip+0x4a4/0x8f0 the ub was in fact a struct dev. when bid != 0 && skip_cnt != 0, bearer_list[bid] may be NULL or other media when other thread changes it. fix this by checking media_id.

PUBLISHED Reserved 2025-04-16 | Published 2025-07-04 | Updated 2026-05-11 | Assigner Linux

Product status

Default status
unaffected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before 3998283e4c32c0fe69edd59b0876c193f50abce6
affected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before c2e17984752b9131061d1a2ca1199da2706337fd
affected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before 8595350615f952fcf8bc861464a6bf6b1129af50
affected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before 05d332ba075753d569d66333d62d60fff5f57ad8
affected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before d3dfe821dfe091c0045044343c8d86596d66e2cf
affected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before 0d3d91c3500f0c480e016faa4e2259c588616e59
affected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before 0f4a72fb266e48dbe928e1d936eab149e4ac3e1b
affected

832629ca5c313e122b22b8e73a6d80f111b1a1ae (git) before f82727adcf2992822e12198792af450a76ebd5ef
affected

Default status
affected

4.9
affected

Any version before 4.9
unaffected

5.4.295 (semver)
unaffected

5.10.239 (semver)
unaffected

5.15.186 (semver)
unaffected

6.1.142 (semver)
unaffected

6.6.95 (semver)
unaffected

6.12.35 (semver)
unaffected

6.15.4 (semver)
unaffected

6.16 (original_commit_for_fix)
unaffected

References

lists.debian.org/debian-lts-announce/2025/10/msg00008.html

lists.debian.org/debian-lts-announce/2025/10/msg00007.html

git.kernel.org/...c/3998283e4c32c0fe69edd59b0876c193f50abce6

git.kernel.org/...c/c2e17984752b9131061d1a2ca1199da2706337fd

git.kernel.org/...c/8595350615f952fcf8bc861464a6bf6b1129af50

git.kernel.org/...c/05d332ba075753d569d66333d62d60fff5f57ad8

git.kernel.org/...c/d3dfe821dfe091c0045044343c8d86596d66e2cf

git.kernel.org/...c/0d3d91c3500f0c480e016faa4e2259c588616e59

git.kernel.org/...c/0f4a72fb266e48dbe928e1d936eab149e4ac3e1b

git.kernel.org/...c/f82727adcf2992822e12198792af450a76ebd5ef

cve.org (CVE-2025-38184)

nvd.nist.gov (CVE-2025-38184)

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