CVE-2025-38184

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < 3998283e4c32c0fe69edd59b0876c193f50abce6affected
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < c2e17984752b9131061d1a2ca1199da2706337fdaffected
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < 8595350615f952fcf8bc861464a6bf6b1129af50affected
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < 05d332ba075753d569d66333d62d60fff5f57ad8affected
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < d3dfe821dfe091c0045044343c8d86596d66e2cfaffected
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < 0d3d91c3500f0c480e016faa4e2259c588616e59affected
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < 0f4a72fb266e48dbe928e1d936eab149e4ac3e1baffected
LinuxLinux832629ca5c313e122b22b8e73a6d80f111b1a1ae < f82727adcf2992822e12198792af450a76ebd5efaffected
LinuxLinux4.9affected
LinuxLinux0 < 4.9unaffected
LinuxLinux5.4.295 <= 5.4.*unaffected
LinuxLinux5.10.239 <= 5.10.*unaffected
LinuxLinux5.15.186 <= 5.15.*unaffected
LinuxLinux6.1.142 <= 6.1.*unaffected
LinuxLinux6.6.95 <= 6.6.*unaffected
LinuxLinux6.12.35 <= 6.12.*unaffected
LinuxLinux6.15.4 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References