CVE-2023-53536

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2025-10-04. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

A fix is available — apply it.

In the Linux kernel, the following vulnerability has been resolved:

blk-crypto: make blk_crypto_evict_key() more robust

If blk_crypto_evict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot management structures.

However, blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So actually the caller proceeds with freeing the blk_crypto_key regardless of the return value of blk_crypto_evict_key().

These two assumptions don't match, and the result is that there can be a use-after-free in blk_crypto_reprogram_all_keys() after one of these errors occurs. (Note, these errors *shouldn't* happen; we're just talking about what happens if they do anyway.)

Fix this by making blk_crypto_evict_key() unlink the key from the keyslot management structures even on failure.

Also improve some comments.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

October 4, 2025

Last Modified

August 5, 2026

Advisory Details (6)

Auto-updated Aug 5, 2026
No patch confirmed yet.
generic

blk-crypto: make blk_crypto_evict_key() more robust - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5c7cb94452901a93e90c2230632e2c12a681bc92
generic

blk-crypto: make blk_crypto_evict_key() more robust - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5c62852942667c613de0458fc797c5b8c36112b5
generic

blk-crypto: make blk_crypto_evict_key() more robust - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/809a5be62e92a444a3c3d7b9f438019d0b322f55
generic

blk-crypto: make blk_crypto_evict_key() more robust - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/64ef787bb1588475163069c2e62fdd8f6c27b1f6
generic

blk-crypto: make blk_crypto_evict_key() more robust - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5bb4005fb667c6e2188fa87950f8d5faf2994410
generic

blk-crypto: make blk_crypto_evict_key() more robust - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/701a8220762ff90615dc91d3543f789391b63298

Vendor Advisories for CVE-2023-53536(1)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-0:5.14.0-427.13.1.el9_42024-04-30redhat
linuxKernel @ 5.10.180—osv

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 18× in last 7d / 51× 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.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-08-05 19:15 UTCEPSS rescore
  2. 2026-08-05 19:15 UTCEPSS rescore
  3. 2026-08-05 10:18 UTCEG score recompute
  4. 2026-08-05 10:18 UTCVendor advisory
  5. 2026-08-05 10:17 UTCGHSA enrichment
  6. 2026-08-04 10:57 UTCEG score recompute
  7. 2026-08-04 10:57 UTCVendor advisory
  8. 2026-08-04 10:57 UTCGHSA enrichment
  9. 2026-08-04 10:36 UTCEPSS rescore
  10. 2026-08-04 09:30 UTCEG score recompute
  11. 2026-08-04 09:30 UTCVendor advisory
  12. 2026-08-04 09:30 UTCGHSA enrichment
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  24. 2026-07-23 18:41 UTCOSV refresh
  25. 2026-07-23 14:16 UTCEPSS rescore
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  1. 2026-07-23 02:29 UTCEG score recompute
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  3. 2026-07-22 14:07 UTCEPSS rescore
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  5. 2026-07-21 15:23 UTCEPSS rescore
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  27. 2026-07-06 16:26 UTCEPSS rescore
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  29. 2026-07-06 13:00 UTCOSV refresh
  30. 2026-07-06 02:22 UTCEPSS rescore
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  50. 2026-06-19 19:24 UTCEPSS rescore
  51. 2026-06-19 19:24 UTCEPSS rescore
  52. 2026-06-18 17:51 UTCEPSS rescore
  53. 2026-06-18 01:05 UTCOSV refresh
  54. 2026-06-17 17:51 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-53536?
CVE-2023-53536 is a high vulnerability published on October 4, 2025. In the Linux kernel, the following vulnerability has been resolved: blk-crypto: make blkcryptoevict_key() more robust If blkcryptoevict_key() sees that the key is still in-use (due to a bug) or that ->keyslot_evict failed, it currently just returns while leaving the key linked into the keyslot…
When was CVE-2023-53536 disclosed?
CVE-2023-53536 was first published in the National Vulnerability Database on October 4, 2025, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-53536 actively exploited?
CVE-2023-53536 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 95.4% of all scored CVEs.
What is the CVSS score of CVE-2023-53536?
CVE-2023-53536 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2023-53536?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-53536, 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.

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