CVE-2026-63800

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-19. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

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

pNFS: Fix use-after-free in pnfs_update_layout()

When hitting the NFS_LAYOUT_RETURN branch in pnfs_update_layout(), the code calls pnfs_prepare_to_retry_layoutget(lo). If it succeeds, pnfs_put_layout_hdr(lo) is called before trace_pnfs_update_layout(), which still references 'lo'. This results in a use-after-free when the tracepoint accesses lo's fields.

Fix this by moving the tracepoint call before pnfs_put_layout_hdr(lo).

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 17, 2026

Advisory Details (8)

Auto-updated Sep 7, 2026
No patch confirmed yet.
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9c0fb5c09ae5bd68dc0038692af8127029cb0385
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9645aaf689aff57427ece3b9fa47d5b5399417f4
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7e37e9b3e82ade881e1798e2f4fcc54aff7793c1
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4ad8b9a85dbf57ca532ee9e65ad7e6498bfbbf98
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2883ddd7542b4437a2ab4908fe2773f690e20889
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/200e7637f4d6a1342987045eea72641524f909dc
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1f24b8302c77dcaf79c64c073877a3b9f4dd25d2
generic

pNFS: Fix use-after-free in pnfs_update_layout() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/13e198a90ca4050f4bee8a3f23680389a6563ccc

Vendor Advisories for CVE-2026-63800(6)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-virtual-hwe-26.04-edge (7.0.0-31.31) @ resolute2026-09-11ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-11ubuntu
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-11ubuntu
redhatkernel-0:5.14.0-687.44.1.el9_82026-09-04redhat
redhatkernel-rt-0:4.18.0-553.159.1.rt7.500.el8_102026-09-03redhat
redhatkernel-0:4.18.0-553.159.1.el8_102026-09-03redhat
redhatkernel-0:6.12.0-211.50.1.el10_22026-09-01redhat

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.

Affected Packages

(5 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
linux5.10.103-1 ... 5.10.92-2 (55 versions)5.10.262-1—
linux-6.16.1.106-3~deb11u1 ... 6.1.176-1~deb11u1 (21 versions)6.1.177-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (54 versions)6.1.177-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (29 versions)6.12.95-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (156 versions)7.1.3-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 24× in last 7d / 226× 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 390 total refreshes for this CVE.

  1. 2026-09-11 20:33 UTCEG score recompute
  2. 2026-09-11 20:33 UTCVendor advisory
  3. 2026-09-11 20:33 UTCGHSA enrichment
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-08 22:01 UTCEPSS rescore
  7. 2026-09-07 23:45 UTCEG score recompute
  8. 2026-09-07 23:45 UTCVendor advisory
  9. 2026-09-07 23:45 UTCGHSA enrichment
  10. 2026-09-07 16:01 UTCEPSS rescore
  11. 2026-09-06 17:35 UTCEG score recompute
  12. 2026-09-06 17:35 UTCVendor advisory
  13. 2026-09-06 17:35 UTCGHSA enrichment
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-06 13:16 UTCVendor advisory
  16. 2026-09-06 13:16 UTCGHSA enrichment
  17. 2026-09-06 04:31 UTCVendor advisory
  18. 2026-09-06 04:31 UTCGHSA enrichment
  19. 2026-09-06 00:29 UTCVendor advisory
  20. 2026-09-06 00:29 UTCGHSA enrichment
  21. 2026-09-05 20:17 UTCEG score recompute
  22. 2026-09-05 20:17 UTCVendor advisory
  23. 2026-09-05 20:17 UTCGHSA enrichment
  24. 2026-09-05 15:31 UTCEPSS rescore
  25. 2026-09-04 05:07 UTCEPSS rescore
Show 75 more
  1. 2026-09-02 14:12 UTCEPSS rescore
  2. 2026-09-01 13:54 UTCEPSS rescore
  3. 2026-09-01 04:40 UTCEPSS rescore
  4. 2026-08-31 03:52 UTCVendor advisory
  5. 2026-08-31 03:52 UTCGHSA enrichment
  6. 2026-08-30 23:49 UTCVendor advisory
  7. 2026-08-30 23:49 UTCGHSA enrichment
  8. 2026-08-30 19:47 UTCEG score recompute
  9. 2026-08-30 19:47 UTCVendor advisory
  10. 2026-08-30 19:47 UTCGHSA enrichment
  11. 2026-08-30 19:17 UTCEPSS rescore
  12. 2026-08-30 15:43 UTCVendor advisory
  13. 2026-08-30 15:43 UTCGHSA enrichment
  14. 2026-08-30 11:18 UTCVendor advisory
  15. 2026-08-30 11:18 UTCGHSA enrichment
  16. 2026-08-30 07:16 UTCVendor advisory
  17. 2026-08-30 07:15 UTCGHSA enrichment
  18. 2026-08-30 03:03 UTCEG score recompute
  19. 2026-08-30 03:03 UTCVendor advisory
  20. 2026-08-30 03:03 UTCGHSA enrichment
  21. 2026-08-30 01:22 UTCEPSS rescore
  22. 2026-08-28 21:42 UTCEPSS rescore
  23. 2026-08-28 01:45 UTCVendor advisory
  24. 2026-08-28 01:45 UTCGHSA enrichment
  25. 2026-08-27 21:25 UTCEG score recompute
  26. 2026-08-27 21:25 UTCVendor advisory
  27. 2026-08-27 21:25 UTCGHSA enrichment
  28. 2026-08-27 14:25 UTCEPSS rescore
  29. 2026-08-27 11:59 UTCVendor advisory
  30. 2026-08-27 11:59 UTCGHSA enrichment
  31. 2026-08-27 02:32 UTCVendor advisory
  32. 2026-08-27 02:31 UTCGHSA enrichment
  33. 2026-08-26 22:29 UTCEG score recompute
  34. 2026-08-26 22:29 UTCVendor advisory
  35. 2026-08-26 22:29 UTCGHSA enrichment
  36. 2026-08-26 14:46 UTCEPSS rescore
  37. 2026-08-26 13:42 UTCVendor advisory
  38. 2026-08-26 13:42 UTCGHSA enrichment
  39. 2026-08-26 09:02 UTCVendor advisory
  40. 2026-08-26 09:02 UTCGHSA enrichment
  41. 2026-08-26 04:59 UTCVendor advisory
  42. 2026-08-26 04:58 UTCGHSA enrichment
  43. 2026-08-26 00:53 UTCVendor advisory
  44. 2026-08-26 00:53 UTCGHSA enrichment
  45. 2026-08-25 20:21 UTCVendor advisory
  46. 2026-08-25 20:21 UTCGHSA enrichment
  47. 2026-08-25 15:42 UTCEG score recompute
  48. 2026-08-25 15:42 UTCVendor advisory
  49. 2026-08-25 15:42 UTCGHSA enrichment
  50. 2026-08-25 13:49 UTCEPSS rescore
  51. 2026-08-25 11:30 UTCVendor advisory
  52. 2026-08-25 11:30 UTCGHSA enrichment
  53. 2026-08-25 07:20 UTCVendor advisory
  54. 2026-08-25 07:20 UTCGHSA enrichment
  55. 2026-08-25 03:16 UTCVendor advisory
  56. 2026-08-25 03:16 UTCGHSA enrichment
  57. 2026-08-24 23:13 UTCVendor advisory
  58. 2026-08-24 23:13 UTCGHSA enrichment
  59. 2026-08-24 19:11 UTCEG score recompute
  60. 2026-08-24 19:11 UTCVendor advisory
  61. 2026-08-24 19:11 UTCGHSA enrichment
  62. 2026-08-24 13:34 UTCVendor advisory
  63. 2026-08-24 13:34 UTCGHSA enrichment
  64. 2026-08-24 09:29 UTCEG score recompute
  65. 2026-08-24 09:29 UTCVendor advisory
  66. 2026-08-24 09:29 UTCGHSA enrichment
  67. 2026-08-24 05:27 UTCVendor advisory
  68. 2026-08-24 05:27 UTCGHSA enrichment
  69. 2026-08-24 01:24 UTCVendor advisory
  70. 2026-08-24 01:24 UTCGHSA enrichment
  71. 2026-08-23 21:20 UTCVendor advisory
  72. 2026-08-23 21:20 UTCGHSA enrichment
  73. 2026-08-23 17:18 UTCVendor advisory
  74. 2026-08-23 17:18 UTCGHSA enrichment
  75. 2026-08-23 13:16 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-63800?
CVE-2026-63800 is a critical vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix use-after-free in pnfsupdatelayout() When hitting the NFSLAYOUTRETURN branch in pnfsupdatelayout(), the code calls pnfspreparetoretrylayoutget(lo). If it succeeds, pnfsputlayouthdr(lo) is called before…
When was CVE-2026-63800 disclosed?
CVE-2026-63800 was first published in the National Vulnerability Database on July 19, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63800 actively exploited?
CVE-2026-63800 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 57.0% of all scored CVEs.
What is the CVSS score of CVE-2026-63800?
CVE-2026-63800 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-63800?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63800, 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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