CVE-2024-27395 (GCVE-0-2024-27395)
Vulnerability from cvelistv5
Published
2024-05-09 16:37
Modified
2026-08-05 11:29
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: net: openvswitch: Fix Use-After-Free in ovs_ct_exit Since kfree_rcu, which is called in the hlist_for_each_entry_rcu traversal of ovs_ct_limit_exit, is not part of the RCU read critical section, it is possible that the RCU grace period will pass during the traversal and the key will be free. To prevent this, it should be changed to hlist_for_each_entry_safe.
References
Impacted products
Vendor Product Version
Linux Linux Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
Version: 11efd5cb04a184eea4f57b68ea63dddd463158d1
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No victim action or interaction is involved.\\nS:U - The corruption is confined to kernel slab memory within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is a standard kernel local privilege-escalation scope.\\nC:H - The use-after-free lets the attacker place controlled data in the freed object and steer the traversal to arbitrary kernel addresses, and the resulting arbitrary-free primitive enables controlled UAFs elsewhere that expose arbitrary kernel memory.\\nI:H - A reclaimed object supplies an attacker-chosen `next` pointer that is passed to `kfree_rcu()`, yielding an arbitrary-address `kvfree()` plus pointer writes into `rcu_head-\u003efunc`/`-\u003enext` \\u2014 a write primitive sufficient for control-flow hijacking and privilege escalation.\\nA:H - Dereferencing and then RCU-freeing a stale list pointer corrupts slab metadata and reliably produces a kernel oops or panic even in unsuccessful exploitation attempts, and the path can be re-triggered at will.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"2db9a8c0a01fa1c762c1e61a13c212c492752994\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"589523cf0b384164e445dd5db8d5b1bf97982424\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"35880c3fa6f8fe281a19975d2992644588ca33d3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"9048616553c65e750d43846f225843ed745ec0d4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"bca6fa2d9a9f560e6b89fd5190b05cc2f5d422c1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"eaa5e164a2110d2fb9e16c8a29e4501882235137\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"edee0758747d7c219e29db9ed1d4eb33e8d32865\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"11efd5cb04a184eea4f57b68ea63dddd463158d1\", \"lessThan\": \"5ea7b72d4fac2fdbc0425cd8f2ea33abe95235b2\", \"versionType\": \"git\"}], \"programFiles\": [\"net/openvswitch/conntrack.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.313\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.275\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.158\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.90\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.30\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/openvswitch/conntrack.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/2db9a8c0a01fa1c762c1e61a13c212c492752994\"}, {\"url\": \"https://git.kernel.org/stable/c/589523cf0b384164e445dd5db8d5b1bf97982424\"}, {\"url\": \"https://git.kernel.org/stable/c/35880c3fa6f8fe281a19975d2992644588ca33d3\"}, {\"url\": \"https://git.kernel.org/stable/c/9048616553c65e750d43846f225843ed745ec0d4\"}, {\"url\": \"https://git.kernel.org/stable/c/bca6fa2d9a9f560e6b89fd5190b05cc2f5d422c1\"}, {\"url\": \"https://git.kernel.org/stable/c/eaa5e164a2110d2fb9e16c8a29e4501882235137\"}, {\"url\": \"https://git.kernel.org/stable/c/edee0758747d7c219e29db9ed1d4eb33e8d32865\"}, {\"url\": \"https://git.kernel.org/stable/c/5ea7b72d4fac2fdbc0425cd8f2ea33abe95235b2\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: openvswitch: Fix Use-After-Free in ovs_ct_exit\\n\\nSince kfree_rcu, which is called in the hlist_for_each_entry_rcu traversal\\nof ovs_ct_limit_exit, is not part of the RCU read critical section, it\\nis possible that the RCU grace period will pass during the traversal and\\nthe key will be free.\\n\\nTo prevent this, it should be changed to hlist_for_each_entry_safe.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.313\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.275\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.216\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.158\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.90\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.30\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.9\", \"versionStartIncluding\": \"4.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"4.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:29:29.192Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-27395\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:29:29.192Z\", \"dateReserved\": \"2024-02-25T13:47:42.677Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-09T16:37:15.196Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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