CVE-2026-64522

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 94% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 5 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

July 25, 2026

Last Modified

July 27, 2026

Advisory Details (3)

Auto-updated Jul 27, 2026
No patch confirmed yet.
generic

net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/abe003b33223ff33552f291644bf35d9c2f992fb
generic

net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ecafd8284e527666e83261e6e57a7c7341d591cb
generic

net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b5bd4249e430f5963d559708ee96a671716d2400

Vendor Advisories for CVE-2026-64522(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 14× in last 7d / 14× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-27 05:26 UTCEG score recompute
  2. 2026-07-27 05:26 UTCGHSA enrichment
  3. 2026-07-27 05:13 UTCEG score recompute▲ 8.80
  4. 2026-07-27 05:13 UTCGHSA enrichment
  5. 2026-07-27 05:12 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 02:45 UTCEG score recompute
  9. 2026-07-26 02:45 UTCGHSA enrichment
  10. 2026-07-25 14:18 UTCEPSS rescore
  11. 2026-07-25 14:18 UTCEPSS rescore
  12. 2026-07-25 10:39 UTCNVD update
  13. 2026-07-25 09:22 UTCEG score recompute
  14. 2026-07-25 09:21 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-64522?
CVE-2026-64522 is a high vulnerability published on July 25, 2026. In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Fix eswitch mode block underflow on IPsec acquire SA mlx5exfrmadd_state() handles acquire-flow temporary SAs by allocating software state and skipping hardware offload setup. That path jumps to the common success label…
When was CVE-2026-64522 disclosed?
CVE-2026-64522 was first published in the National Vulnerability Database on July 25, 2026, with the most recent update on July 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64522 actively exploited?
CVE-2026-64522 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.8% of all scored CVEs.
What is the CVSS score of CVE-2026-64522?
CVE-2026-64522 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-64522?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64522, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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