CVE-2026-64522

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/b5bd4249e430f5963d559708ee96a671716d2400
• https://git.kernel.org/stable/c/ecafd8284e527666e83261e6e57a7c7341d591cb
• https://git.kernel.org/stable/c/abe003b33223ff33552f291644bf35d9c2f992fb

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