CVE-2025-38184

tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer

State: Published
Severity: 7.8 High
Published: Jul 4, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 3998283e4c32c0fe69edd59b0876c193f50abce6Affected 832629ca5c313e122b22b8e73a6d80f111b1a1ae to before c2e17984752b9131061d1a2ca1199da2706337fdAffected 832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 8595350615f952fcf8bc861464a6bf6b1129af50Affected 832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 05d332ba075753d569d66333d62d60fff5f57ad8Affected 832629ca5c313e122b22b8e73a6d80f111b1a1ae to before d3dfe821dfe091c0045044343c8d86596d66e2cfAffected 832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 0d3d91c3500f0c480e016faa4e2259c588616e59Affected 832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 0f4a72fb266e48dbe928e1d936eab149e4ac3e1bAffected 832629ca5c313e122b22b8e73a6d80f111b1a1ae to before f82727adcf2992822e12198792af450a76ebd5efAffected
LinuxLinux	4.9Affected before 4.9Not affected 5.4.295 through 5.4.Not affected 5.10.239 through 5.10.Not affected 5.15.186 through 5.15.Not affected 6.1.142 through 6.1.Not affected 6.6.95 through 6.6.Not affected 6.12.35 through 6.12.Not affected 6.15.4 through 6.15.*Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 3998283e4c32c0fe69edd59b0876c193f50abce6Affected
832629ca5c313e122b22b8e73a6d80f111b1a1ae to before c2e17984752b9131061d1a2ca1199da2706337fdAffected
832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 8595350615f952fcf8bc861464a6bf6b1129af50Affected
832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 05d332ba075753d569d66333d62d60fff5f57ad8Affected
832629ca5c313e122b22b8e73a6d80f111b1a1ae to before d3dfe821dfe091c0045044343c8d86596d66e2cfAffected
832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 0d3d91c3500f0c480e016faa4e2259c588616e59Affected
832629ca5c313e122b22b8e73a6d80f111b1a1ae to before 0f4a72fb266e48dbe928e1d936eab149e4ac3e1bAffected
832629ca5c313e122b22b8e73a6d80f111b1a1ae to before f82727adcf2992822e12198792af450a76ebd5efAffected

LinuxLinux

4.9Affected
before 4.9Not affected
5.4.295 through 5.4.*Not affected
5.10.239 through 5.10.*Not affected
5.15.186 through 5.15.*Not affected
6.1.142 through 6.1.*Not affected
6.6.95 through 6.6.*Not affected
6.12.35 through 6.12.*Not affected
6.15.4 through 6.15.*Not affected
6.16 and laterNot affected

References

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