CVE-2026-23421

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-04-03. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: 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:

drm/xe/configfs: Free ctx_restore_mid_bb in release

ctx_restore_mid_bb memory is allocated in wa_bb_store(), but xe_config_device_release() only frees ctx_restore_post_bb.

Free ctx_restore_mid_bb[0].cs as well to avoid leaking the allocation when the configfs device is removed.

(cherry picked from commit a235e7d0098337c3f2d1e8f3610c719a589e115f)

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

April 3, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jul 25, 2026
No patch confirmed yet.
generic

drm/xe/configfs: Free ctx_restore_mid_bb in release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e377182f0266f46f02d01838e6bde67b9dac0d66
generic

drm/xe/configfs: Free ctx_restore_mid_bb in release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7f971dfd48983074adc7bbcea3ee95ce7aad47cb
generic

drm/xe/configfs: Free ctx_restore_mid_bb in release - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/3557359ea3df32430ea7c30f7a708ca9a91d7e0e

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
linuxKernel @ 6.18.17—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.

Data Freshness Timeline

(refreshed 10× in last 7d / 37× 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 116 total refreshes for this CVE.

  1. 2026-07-27 14:13 UTCEPSS rescore
  2. 2026-07-26 09:20 UTCEG score recompute
  3. 2026-07-26 09:20 UTCGHSA enrichment
  4. 2026-07-25 14:17 UTCEPSS rescore
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  6. 2026-07-24 14:17 UTCEPSS rescore
  7. 2026-07-23 14:18 UTCEPSS rescore
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  9. 2026-07-23 03:07 UTCEG score recompute
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-20 17:08 UTCEPSS rescore
  12. 2026-07-19 14:31 UTCEPSS rescore
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  16. 2026-07-18 10:04 UTCEPSS rescore
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  18. 2026-07-17 03:24 UTCOSV refresh
  19. 2026-07-16 17:03 UTCEPSS rescore
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  21. 2026-07-13 22:30 UTCEPSS rescore
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  24. 2026-07-12 05:46 UTCEPSS rescore
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  1. 2026-07-08 15:15 UTCEPSS rescore
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  3. 2026-07-07 13:46 UTCEPSS rescore
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  11. 2026-06-30 23:22 UTCEPSS rescore
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  18. 2026-06-25 13:49 UTCEPSS rescore
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  20. 2026-06-23 21:33 UTCEPSS rescore
  21. 2026-06-23 21:32 UTCEPSS rescore
  22. 2026-06-22 14:25 UTCEPSS rescore
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  24. 2026-06-21 14:56 UTCEPSS rescore
  25. 2026-06-21 14:56 UTCEPSS rescore
  26. 2026-06-21 01:59 UTCEPSS rescore
  27. 2026-06-21 01:59 UTCEPSS rescore
  28. 2026-06-19 19:25 UTCEPSS rescore
  29. 2026-06-19 19:25 UTCEPSS rescore
  30. 2026-06-18 17:52 UTCEPSS rescore
  31. 2026-06-17 17:53 UTCEPSS rescore
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  35. 2026-06-14 23:18 UTCEPSS rescore
  36. 2026-06-13 23:00 UTCEPSS rescore
  37. 2026-06-11 22:06 UTCGHSA enrichment
  38. 2026-06-11 14:00 UTCEPSS rescore
  39. 2026-06-10 22:18 UTCEPSS rescore
  40. 2026-06-10 13:42 UTCGHSA enrichment
  41. 2026-06-10 13:22 UTCEPSS rescore
  42. 2026-06-09 14:35 UTCGHSA enrichment
  43. 2026-06-08 14:17 UTCEPSS rescore
  44. 2026-06-08 14:17 UTCEPSS rescore
  45. 2026-06-08 09:27 UTCGHSA enrichment
  46. 2026-06-07 15:25 UTCEPSS rescore
  47. 2026-06-07 15:24 UTCEPSS rescore
  48. 2026-06-07 10:58 UTCGHSA enrichment
  49. 2026-06-06 13:47 UTCEPSS rescore
  50. 2026-06-06 13:47 UTCEPSS rescore
  51. 2026-06-06 13:47 UTCEPSS rescore
  52. 2026-06-05 22:47 UTCEPSS rescore
  53. 2026-06-05 06:10 UTCEPSS rescore
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  55. 2026-06-04 13:12 UTCEPSS rescore
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  58. 2026-06-02 20:13 UTCEPSS rescore
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  60. 2026-06-01 13:51 UTCEPSS rescore
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  68. 2026-05-29 13:44 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-23421?
CVE-2026-23421 is a medium vulnerability published on April 3, 2026. In the Linux kernel, the following vulnerability has been resolved: drm/xe/configfs: Free ctxrestoremid_bb in release ctxrestoremidbb memory is allocated in wabb_store(), but xeconfigdevicerelease() only frees ctxrestorepostbb. Free ctxrestoremid_bb[0].cs as well to avoid leaking the allocation…
When was CVE-2026-23421 disclosed?
CVE-2026-23421 was first published in the National Vulnerability Database on April 3, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23421 actively exploited?
CVE-2026-23421 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 98.3% of all scored CVEs.
What is the CVSS score of CVE-2026-23421?
CVE-2026-23421 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-23421?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23421, 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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