CVE-2025-38184 (GCVE-0-2025-38184)
Vulnerability from cvelistv5
Published
2025-07-04 13:37
Modified
2026-10-15 21:52
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
Version: 832629ca5c313e122b22b8e73a6d80f111b1a1ae
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No remote packet processing is involved.\\nAC:L - The primary path (`bid==0 \u0026\u0026 skip_cnt==0`) is fully deterministic \\u2014 enable an eth bearer on any non-loopback netdev, then dump remoteip by that bearer name; no race needs to be won, and the commit\u0027s reproducer is a straightforward three-step PoC.\\nPR:L - A local unprivileged account suffices: the TIPC v2 genl ops carry no `GENL_ADMIN_PERM` and the family has no `pre_doit` check, and any residual CAP_NET_ADMIN needed to create the backing netdev is obtainable via `unshare -Urn` since the family is `.netnsok = true`.\\nUI:N - The attacker performs every step (bearer enable, netlink dump) from their own process; no victim action or interaction is required.\\nS:U - The type confusion and its consequences stay within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\\nC:H - A `struct net_device` is walked as a `struct udp_bearer` list, and each traversed \\\"node\\\" has 20 bytes at `ptr - 56` copied into the netlink reply returned to the caller, disclosing kernel memory; the pointer bytes fall in `tc_to_txq[]`, which the same attacker can influence via tc mqprio, moving this toward a controlled kernel read.\\nI:H - This is a genuine type confusion \\u2014 a `net_device` is dereferenced as a different object type through a partially attacker-influenceable pointer, which per kernel scoring guidance is treated as High integrity impact.\\nA:H - The confirmed and trivially reproducible result is a general protection fault / KASAN null-ptr-deref in `tipc_udp_nl_dump_remoteip()`, i.e. a kernel oops that any local user can trigger repeatedly.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"3998283e4c32c0fe69edd59b0876c193f50abce6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"c2e17984752b9131061d1a2ca1199da2706337fd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"8595350615f952fcf8bc861464a6bf6b1129af50\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"05d332ba075753d569d66333d62d60fff5f57ad8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"d3dfe821dfe091c0045044343c8d86596d66e2cf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"0d3d91c3500f0c480e016faa4e2259c588616e59\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"0f4a72fb266e48dbe928e1d936eab149e4ac3e1b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"832629ca5c313e122b22b8e73a6d80f111b1a1ae\", \"lessThan\": \"f82727adcf2992822e12198792af450a76ebd5ef\", \"versionType\": \"git\"}], \"programFiles\": [\"net/tipc/udp_media.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.295\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.239\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.186\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.142\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.95\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.35\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.15.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/tipc/udp_media.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3998283e4c32c0fe69edd59b0876c193f50abce6\"}, {\"url\": \"https://git.kernel.org/stable/c/c2e17984752b9131061d1a2ca1199da2706337fd\"}, {\"url\": \"https://git.kernel.org/stable/c/8595350615f952fcf8bc861464a6bf6b1129af50\"}, {\"url\": \"https://git.kernel.org/stable/c/05d332ba075753d569d66333d62d60fff5f57ad8\"}, {\"url\": \"https://git.kernel.org/stable/c/d3dfe821dfe091c0045044343c8d86596d66e2cf\"}, {\"url\": \"https://git.kernel.org/stable/c/0d3d91c3500f0c480e016faa4e2259c588616e59\"}, {\"url\": \"https://git.kernel.org/stable/c/0f4a72fb266e48dbe928e1d936eab149e4ac3e1b\"}, {\"url\": \"https://git.kernel.org/stable/c/f82727adcf2992822e12198792af450a76ebd5ef\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer\\n\\nThe reproduction steps:\\n1. create a tun interface\\n2. enable l2 bearer\\n3. TIPC_NL_UDP_GET_REMOTEIP with media name set to tun\\n\\ntipc: Started in network mode\\ntipc: Node identity 8af312d38a21, cluster identity 4711\\ntipc: Enabled bearer \u003ceth:syz_tun\u003e, priority 1\\nOops: general protection fault\\nKASAN: null-ptr-deref in range\\nCPU: 1 UID: 1000 PID: 559 Comm: poc Not tainted 6.16.0-rc1+ #117 PREEMPT\\nHardware name: QEMU Ubuntu 24.04 PC\\nRIP: 0010:tipc_udp_nl_dump_remoteip+0x4a4/0x8f0\\n\\nthe ub was in fact a struct dev.\\n\\nwhen bid != 0 \u0026\u0026 skip_cnt != 0, bearer_list[bid] may be NULL or\\nother media when other thread changes it.\\n\\nfix this by checking media_id.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.295\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.239\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.186\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.142\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.95\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.35\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15.4\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:00:12.781Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-38184\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-15T21:52:10.702Z\", \"dateReserved\": \"2025-04-16T04:51:23.992Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-07-04T13:37:11.226Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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