CVE-2026-31504High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: net: fix fanout UAF in packet_release() via NETDEV_UP race `packet_release()` has a race window where `NETDEV_UP` can re-register a socket into a fanout group's `arr[]…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
In the Linux kernel, the following vulnerability has been resolved:
net: fix fanout UAF in packet_release() via NETDEV_UP race
packet_release() has a race window where NETDEV_UP can re-register a
socket into a fanout group's arr[] array. The re-registration is not
cleaned up by fanout_release(), leaving a dangling pointer in the fanout
array.
packet_release() does NOT zero po->num in its bind_lock section.
After releasing bind_lock, po->num is still non-zero and po->ifindex
still matches the bound device. A concurrent packet_notifier(NETDEV_UP)
that already found the socket in sklist can re-register the hook.
For fanout sockets, this re-registration calls __fanout_link(sk, po)
which adds the socket back into f->arr[] and increments f->num_members,
but does NOT increment f->sk_ref.
The fix sets po->num to zero in packet_release while bind_lock is
held to prevent NETDEV_UP from linking, preventing the race window.
This bug was found following an additional audit with Claude Code based on CVE-2025-38617.
Linux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < ee642b1962caa9aa231c01abbd58bc453ae6b66eLinux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < 42cfd7898eeed290c9fb73f732af1f7d6b0a703eLinux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < 1b4c03f8892d955385c202009af7485364731bb9Linux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < 654386baef228c2992dbf604c819e4c7c35fc71bLinux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < 75fe6db23705a1d55160081f7b37db9665b1880bLinux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < d0c7cdc15fdf8c4f91aca1928e52295d175b6ec6Linux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < ceccbfc6de720ad633519a226715989cfb065af1Linux >= ce06b03e60fc19c680d1bf873e779bf11c2fc518 < 42156f93d123436f2a27c468f18c966b7e5db796Linux 3.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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