CVE-2026-53393

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-19. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 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:

nfsd: reset write verifier on deferred writeback errors

nfsd_vfs_write() and nfsd_commit() both call filemap_check_wb_err() to detect deferred writeback errors, but neither rotates the server's write verifier (nn->writeverf) when this check fails. Every other durable-storage-failure path in these functions calls commit_reset_write_verifier() before returning an error.

The missing rotation means clients holding UNSTABLE write data under the current verifier will COMMIT, receive the unchanged verifier back, and conclude their data is durable — silently dropping data that failed writeback. This violates the UNSTABLE+COMMIT durability contract (RFC 1813 §3.3.7, RFC 8881 §18.32).

Add commit_reset_write_verifier() calls at both filemap_check_wb_err() error sites, matching the pattern used by adjacent error paths in the same functions. The helper already filters -EAGAIN and -ESTALE internally, so the calls are unconditionally safe.

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
3%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 17, 2026

Advisory Details (8)

Auto-updated Jul 29, 2026
No patch confirmed yet.
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/bc2baca02ec56da7707a74ed5d340b0a1dff1841
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b8e5894e56cff70fa245628fe16f0ad6367f8090
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b027cca33c97354149fcc0ddeede4525c41093cd
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/666e837b247fcadf2d8d508b9b0e49d720393eb4
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/43b65d2997963e80e8d8d86520bcb1e0751227de
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4367afc119c51e17a616f6908772b7e2c2c4013f
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2090b05803faab8a9fa62fbff871007862cac1b7
generic

nfsd: reset write verifier on deferred writeback errors - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1dd664b39774a9c89b72de8e59bf9ef4b3aaff2e

Vendor Advisories for CVE-2026-53393(2)

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

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 ... 6.1.177-1~deb11u1 (22 versions)6.1.180-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (55 versions)6.1.180-1—
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 (154 versions)7.1.3-1—

Data Freshness Timeline

(refreshed 22× in last 7d / 93× 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 119 total refreshes for this CVE.

  1. 2026-08-30 03:04 UTCEG score recompute
  2. 2026-08-30 03:04 UTCVendor advisory
  3. 2026-08-30 03:04 UTCGHSA enrichment
  4. 2026-08-30 01:22 UTCEPSS rescore
  5. 2026-08-28 21:41 UTCEPSS rescore
  6. 2026-08-28 02:48 UTCEG score recompute
  7. 2026-08-28 02:48 UTCVendor advisory
  8. 2026-08-28 02:48 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 03:07 UTCEG score recompute
  11. 2026-08-27 03:07 UTCVendor advisory
  12. 2026-08-27 03:07 UTCGHSA enrichment
  13. 2026-08-26 14:46 UTCEPSS rescore
  14. 2026-08-26 03:26 UTCEG score recompute
  15. 2026-08-26 03:26 UTCVendor advisory
  16. 2026-08-26 03:26 UTCGHSA enrichment
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 03:43 UTCEG score recompute
  19. 2026-08-25 03:43 UTCVendor advisory
  20. 2026-08-25 03:43 UTCGHSA enrichment
  21. 2026-08-24 04:02 UTCVendor advisory
  22. 2026-08-24 04:02 UTCGHSA enrichment
  23. 2026-08-23 04:21 UTCVendor advisory
  24. 2026-08-23 04:20 UTCGHSA enrichment
  25. 2026-08-22 04:40 UTCEG score recompute
Show 75 more
  1. 2026-08-22 04:40 UTCVendor advisory
  2. 2026-08-22 04:40 UTCGHSA enrichment
  3. 2026-08-21 23:49 UTCEPSS rescore
  4. 2026-08-21 04:59 UTCEG score recompute
  5. 2026-08-21 04:59 UTCVendor advisory
  6. 2026-08-21 04:59 UTCGHSA enrichment
  7. 2026-08-20 22:55 UTCEPSS rescore
  8. 2026-08-20 05:18 UTCEG score recompute
  9. 2026-08-20 05:18 UTCGHSA enrichment
  10. 2026-08-19 17:04 UTCEPSS rescore
  11. 2026-08-19 05:36 UTCEG score recompute
  12. 2026-08-19 05:36 UTCVendor advisory
  13. 2026-08-19 05:36 UTCGHSA enrichment
  14. 2026-08-18 13:48 UTCEPSS rescore
  15. 2026-08-18 05:54 UTCEG score recompute
  16. 2026-08-18 05:54 UTCGHSA enrichment
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-17 05:24 UTCVendor advisory
  19. 2026-08-17 05:24 UTCGHSA enrichment
  20. 2026-08-16 16:16 UTCEG score recompute
  21. 2026-08-16 16:16 UTCVendor advisory
  22. 2026-08-16 16:16 UTCGHSA enrichment
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 16:35 UTCEG score recompute
  26. 2026-08-15 16:35 UTCVendor advisory
  27. 2026-08-15 16:35 UTCGHSA enrichment
  28. 2026-08-15 01:30 UTCEPSS rescore
  29. 2026-08-14 16:54 UTCEG score recompute
  30. 2026-08-14 16:54 UTCVendor advisory
  31. 2026-08-14 16:54 UTCGHSA enrichment
  32. 2026-08-13 22:00 UTCEPSS rescore
  33. 2026-08-13 17:12 UTCGHSA enrichment
  34. 2026-08-12 17:31 UTCEG score recompute
  35. 2026-08-12 17:31 UTCGHSA enrichment
  36. 2026-08-12 13:51 UTCEPSS rescore
  37. 2026-08-11 17:50 UTCEG score recompute
  38. 2026-08-11 17:50 UTCGHSA enrichment
  39. 2026-08-11 00:00 UTCEPSS rescore
  40. 2026-08-10 18:09 UTCGHSA enrichment
  41. 2026-08-09 18:28 UTCEG score recompute
  42. 2026-08-09 18:28 UTCGHSA enrichment
  43. 2026-08-09 13:46 UTCEPSS rescore
  44. 2026-08-08 18:47 UTCEG score recompute
  45. 2026-08-08 18:47 UTCGHSA enrichment
  46. 2026-08-08 16:37 UTCEPSS rescore
  47. 2026-08-07 19:05 UTCEG score recompute
  48. 2026-08-07 19:05 UTCGHSA enrichment
  49. 2026-08-06 19:24 UTCEG score recompute
  50. 2026-08-06 19:24 UTCGHSA enrichment
  51. 2026-08-06 13:47 UTCEPSS rescore
  52. 2026-08-05 19:43 UTCEG score recompute
  53. 2026-08-05 19:43 UTCGHSA enrichment
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-04 20:02 UTCEG score recompute
  56. 2026-08-04 20:02 UTCGHSA enrichment
  57. 2026-08-04 15:10 UTCEPSS rescore
  58. 2026-08-04 10:39 UTCEPSS rescore
  59. 2026-08-03 20:21 UTCEG score recompute
  60. 2026-08-03 20:21 UTCGHSA enrichment
  61. 2026-08-03 10:36 UTCEPSS rescore
  62. 2026-08-02 20:38 UTCEG score recompute
  63. 2026-08-02 20:38 UTCGHSA enrichment
  64. 2026-08-02 02:27 UTCEPSS rescore
  65. 2026-08-01 20:57 UTCEG score recompute
  66. 2026-08-01 20:57 UTCGHSA enrichment
  67. 2026-08-01 04:16 UTCEPSS rescore
  68. 2026-07-31 21:15 UTCGHSA enrichment
  69. 2026-07-30 21:31 UTCEG score recompute
  70. 2026-07-30 21:31 UTCGHSA enrichment
  71. 2026-07-30 16:28 UTCEPSS rescore
  72. 2026-07-30 01:30 UTCEPSS rescore
  73. 2026-07-29 20:40 UTCEG score recompute▲ 5.50
  74. 2026-07-29 20:40 UTCGHSA enrichment
  75. 2026-07-29 20:39 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM

Frequently asked(5)

What is CVE-2026-53393?
CVE-2026-53393 is a medium vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: nfsd: reset write verifier on deferred writeback errors nfsdvfswrite() and nfsdcommit() both call filemapcheckwberr() to detect deferred writeback errors, but neither rotates the server's write verifier (nn->writeverf) when this…
When was CVE-2026-53393 disclosed?
CVE-2026-53393 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-2026-53393 actively exploited?
CVE-2026-53393 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 97.1% of all scored CVEs.
What is the CVSS score of CVE-2026-53393?
CVE-2026-53393 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-53393?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53393, 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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