CVE-2026-68338 (GCVE-0-2026-68338)
Vulnerability from cvelistv5
Published
2026-08-10 12:03
Modified
2026-10-19 21:09
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/packet: avoid fanout hook re-registration after unregister packet_set_ring() temporarily detaches a socket from packet delivery while reconfiguring its ring. It records the previous running state, clears po->num, unregisters the protocol hook when needed, drops po->bind_lock, and later restores po->num and re-registers the hook from the saved was_running value. That unlocked window can race with NETDEV_UNREGISTER. The notifier can observe the socket as not running, skip __unregister_prot_hook(), and invalidate the per-socket binding by setting po->ifindex to -1 and clearing po->prot_hook.dev. A one-member fanout group can still retain its shared fanout hook device pointer. When packet_set_ring() resumes, re-registering solely from the stale was_running state can re-add the fanout hook after the device has been unregistered. Treat po->ifindex == -1 as an invalidated binding after reacquiring po->bind_lock. This is distinct from ifindex 0, the normal unbound/wildcard state: ifindex -1 marks an existing device binding that was invalidated when the device was unregistered. Restore po->num as before, but do not re-register the hook if device unregister already detached the socket.
References
Impacted products
Vendor Product Version
Linux Linux Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
Version: dc99f600698dcac69b8f56dda9a8a00d645c5ffc
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    "datePublished": "2026-08-10T12:03:14.549Z",
    "dateReserved": "2026-07-30T09:28:09.384Z",
    "dateUpdated": "2026-10-19T21:09:05.428Z",
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no hypervisor, IOMMU or other trust boundary is crossed.\\nC:H - The fanout packet_type is left linked into a net_device that is being torn down, a dangling registration on soon-to-be-freed memory; such stale-pointer state in the ptype lists can be leveraged for kernel memory disclosure.\\nI:H - The dangling list node in the freed net_device\u0027s ptype list yields a list_del write into freed memory when the hook is later removed, a controllable write primitive typical of use-after-free exploitation.\\nA:H - The re-added hook makes netdev_run_todo() hit BUG_ON(!list_empty(\u0026dev-\u003eptype_all)) while RTNL is held, oopsing the kernel and permanently wedging all further network configuration \\u2014 a repeatable, unprivileged host-wide denial of service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"acb40ebfa5c4d62f84339fcbf713f2a9fd033a71\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"c820f4b7f2fa38f8769db0d0cefdd94e2721504d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"4628efbdc7affd094181f5263e65c1062e31f15f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"80ec024d53a05c60ad1d08968dcf745f10c1665c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"0a052e0808e015e68144a9877e6ef42b952c49fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"1bc55c29cd85818e9052f17deb287d5a11fb817f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"a885387dae7986a55bae5c77a15bdd447f64e9b9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dc99f600698dcac69b8f56dda9a8a00d645c5ffc\", \"lessThan\": \"50aff80475abd3533eef4320477037e6fcc6b56e\", \"versionType\": \"git\"}], \"programFiles\": [\"net/packet/af_packet.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.1\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.1\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.216\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.183\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.148\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.101\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.42\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/packet/af_packet.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/acb40ebfa5c4d62f84339fcbf713f2a9fd033a71\"}, {\"url\": \"https://git.kernel.org/stable/c/c820f4b7f2fa38f8769db0d0cefdd94e2721504d\"}, {\"url\": \"https://git.kernel.org/stable/c/4628efbdc7affd094181f5263e65c1062e31f15f\"}, {\"url\": \"https://git.kernel.org/stable/c/80ec024d53a05c60ad1d08968dcf745f10c1665c\"}, {\"url\": \"https://git.kernel.org/stable/c/0a052e0808e015e68144a9877e6ef42b952c49fa\"}, {\"url\": \"https://git.kernel.org/stable/c/1bc55c29cd85818e9052f17deb287d5a11fb817f\"}, {\"url\": \"https://git.kernel.org/stable/c/a885387dae7986a55bae5c77a15bdd447f64e9b9\"}, {\"url\": \"https://git.kernel.org/stable/c/50aff80475abd3533eef4320477037e6fcc6b56e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/packet: avoid fanout hook re-registration after unregister\\n\\npacket_set_ring() temporarily detaches a socket from packet delivery while\\nreconfiguring its ring. It records the previous running state, clears\\npo-\u003enum, unregisters the protocol hook when needed, drops po-\u003ebind_lock,\\nand later restores po-\u003enum and re-registers the hook from the saved\\nwas_running value.\\n\\nThat unlocked window can race with NETDEV_UNREGISTER. The notifier can\\nobserve the socket as not running, skip __unregister_prot_hook(), and\\ninvalidate the per-socket binding by setting po-\u003eifindex to -1 and clearing\\npo-\u003eprot_hook.dev. A one-member fanout group can still retain its shared\\nfanout hook device pointer. When packet_set_ring() resumes, re-registering\\nsolely from the stale was_running state can re-add the fanout hook after\\nthe device has been unregistered.\\n\\nTreat po-\u003eifindex == -1 as an invalidated binding after reacquiring\\npo-\u003ebind_lock. This is distinct from ifindex 0, the normal\\nunbound/wildcard state: ifindex -1 marks an existing device binding that\\nwas invalidated when the device was unregistered. Restore po-\u003enum as\\nbefore, but do not re-register the hook if device unregister already\\ndetached the socket.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.42\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.6\", \"versionStartIncluding\": \"3.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:33:38.308Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-68338\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T21:09:05.428Z\", \"dateReserved\": \"2026-07-30T09:28:09.384Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-10T12:03:14.549Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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