Review reviewHigh

CVE-2026-64522

Linux

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 acquir...

CVSS: 8.8
EPSS: -
CISA KEV: Not listed
Published: 2026.07.25

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Linux
Affected versions: >= 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 < b5bd4249e430f5963d559708ee96a671716d2400, >= 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 < ecafd8284e527666e83261e6e57a7c7341d591cb, >= 22239eb258bc1e6ccdb2d3502fce1cc2b2a88386 < abe003b33223ff33552f291644bf35d9c2f992fb, >= 993c4ba71596c30418ba5a0ddcf4f9c2f431466a, >= 6.17.4 < 6.18, >= 6.18
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE: Not available