CVE-2026-64522
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 versions
Linux kernel versions
6.17.4,
6.18
and later are affected. Fixed in
6.18.34,
7.0.11,
7.1
and their respective stable series.
References
3 totalFrequently asked questions
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What is CVE-2026-64522?
CVE-2026-64522 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.17.4 onward and has been patched in 6.18.34, 7.0.11 and 7.1. CVE-2026-64522 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-64522?
Yes. CVE-2026-64522 has been patched. Fixed versions include 6.18.34, 7.0.11 and 7.1. If you are running Linux kernel 6.17.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-64522 actively exploited?
No. CVE-2026-64522 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.