PT-2026-64739 · Linux · Linux

CVE-2026-64518 · Published 2026-07-25 · Updated 2026-07-25

NVD

In the Linux kernel, the following vulnerability has been resolved:

tcp: Fix out-of-bounds access for twsk in tcp ao established key().

lockdep sock is held() was added in tcp ao established key() by the cited commit.

It can be called from tcp v[46] timewait ack() with twsk.

Since it does not have sk->sk lock, the lockdep annotation results in out-of-bound access.

$ pahole -C tcp timewait sock vmlinux | grep size /* size: 288, cachelines: 5, members: 8 / $ pahole -C sock vmlinux | grep sk lock socket lock t sk lock; / 440 192 */

Let's not use lockdep sock is held() for TCP TIME WAIT.

Related Identifiers

CVE-2026-64518

Affected Products

Linux

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-64518 · Security Note
• https://git.kernel.org/stable/c/510db031ba6eb40134f84c90ef963ea4b6dfb878 · Note
• https://git.kernel.org/stable/c/87bb3e719042f0030a6dad39118c6a6b2a491ad9 · Note
• https://git.kernel.org/stable/c/29cf64d128c94cf98d1c69d8b2962d39db5ff4c6 · Note
• https://git.kernel.org/stable/c/03cb001ef87b3f8d859cf7f96329acf3d6235d29 · Note