CVE-2026-53392

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

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

NFSv4/flexfiles: reject zero filehandle version count

ff_layout_alloc_lseg() decodes the filehandle-version array count from the flexfiles layout body. The value is used as the count for kzalloc_objs(), and the current code only rejects NULL.

A zero count yields ZERO_SIZE_PTR, which can be stored in dss_info->fh_versions even though later flexfiles paths assume that at least one filehandle version exists.

Reject fh_count == 0 before the allocation, matching the existing zero version_count validation in the flexfiles GETDEVICEINFO parser.

A QEMU/KASAN run with a malformed flexfiles layout hit:

KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:ff_layout_encode_ff_layoutupdate.isra.0+0x15f/0x750 ff_layout_encode_layoutreturn+0x683/0x970 nfs4_xdr_enc_layoutreturn+0x278/0x3a0 Kernel panic - not syncing: Fatal exception

The patched kernel rejects the malformed layout without KASAN/oops/panic, and a valid fh_count=1 regression still opens, reads, and unmounts cleanly.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Jul 21, 2026
No patch confirmed yet.
generic

NFSv4/flexfiles: reject zero filehandle version count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d8c90c7cc061265d5f2813a1f5c82ef2f4707e67
generic

NFSv4/flexfiles: reject zero filehandle version count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7779c85028a0676fb190cde4f0c540f4f8e97761
generic

NFSv4/flexfiles: reject zero filehandle version count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2c6bb3c40bc24f6aa8dfbe6fe98c3ad6389203f2
generic

NFSv4/flexfiles: reject zero filehandle version count - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2131ed64b767ffa8bcdb3677d90f3964e39aabc8

Vendor Advisories for CVE-2026-53392(6)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-gcp-edge (7.0.0-1011.11~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-tools-oem-7.0 (7.0.0-1013.13) @ resolute2026-09-18ubuntu
ubuntulinux-tools-nvidia-hwe-24.04-edge (7.0.0-1018.18~24.04.1) @ noble2026-09-18ubuntu
ubuntulinux-virtual-hwe-24.04-edge (7.0.0-31.31~24.04.1) @ noble2026-09-18ubuntu
redhatkernel-0:5.14.0-687.44.1.el9_82026-09-04redhat
redhatkernel-0:4.18.0-553.159.1.el8_102026-09-03redhat
redhatkernel-rt-0:4.18.0-553.159.1.rt7.500.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

(6 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(2)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (55 versions)6.1.180-1—
linux-6.12—6.12.100-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (30 versions)6.12.96-1—
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

(4)

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 20× in last 7d / 97× 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 225 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53392?
CVE-2026-53392 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: NFSv4/flexfiles: reject zero filehandle version count fflayoutalloc_lseg() decodes the filehandle-version array count from the flexfiles layout body. The value is used as the count for kzalloc_objs(), and the current code only…
When was CVE-2026-53392 disclosed?
CVE-2026-53392 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-2026-53392 actively exploited?
CVE-2026-53392 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 56.3% of all scored CVEs.
What is the CVSS score of CVE-2026-53392?
CVE-2026-53392 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-53392?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53392, 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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