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

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Summary

CVECVE-2026-64522
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:38 UTC
Updated2026-07-25 10:17:38 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002060000 probability, percentile 0.108620000 (date 2026-07-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 b5bd4249e430f5963d559708ee96a671716d2400 git Not specified
CNA Linux Linux affected 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 ecafd8284e527666e83261e6e57a7c7341d591cb git Not specified
CNA Linux Linux affected 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 abe003b33223ff33552f291644bf35d9c2f992fb git Not specified
CNA Linux Linux affected 993c4ba71596c30418ba5a0ddcf4f9c2f431466a git Not specified
CNA Linux Linux affected 6.17.4 6.18 semver Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ecafd8284e527666e83261e6e57a7c7341d591cb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/abe003b33223ff33552f291644bf35d9c2f992fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b5bd4249e430f5963d559708ee96a671716d2400 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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