PT-2026-64743 · Linux · Linux

CVE-2026-64522 · Published 2026-07-25 · Updated 2026-07-25

Mitre

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

net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA

mlx5e xfrm add state() handles acquire-flow temporary SAs by allocating software state and skipping hardware offload setup.

That path jumps to the common success label before taking the eswitch mode block. After tunnel-mode validation was moved earlier, the common success label unconditionally calls mlx5 eswitch unblock mode(). For acquire SAs, this decrements esw->offloads.num block mode without a matching increment.

Return directly after installing the acquire SA offload handle, so only the paths that successfully called mlx5 eswitch block mode() call the matching unblock.

Related Identifiers

CVE-2026-64522

Affected Products

Linux

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-64522 · Security Note
• https://git.kernel.org/stable/c/b5bd4249e430f5963d559708ee96a671716d2400 · Note
• https://git.kernel.org/stable/c/ecafd8284e527666e83261e6e57a7c7341d591cb · Note
• https://git.kernel.org/stable/c/abe003b33223ff33552f291644bf35d9c2f992fb · Note