CVE-2026-63814

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
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:

f2fs: validate ACL entry sizes in f2fs_acl_from_disk()

f2fs_acl_count() only validates the aggregate ACL xattr length. A malformed ACL can still place ACL_USER or ACL_GROUP in a slot that only contains struct f2fs_acl_entry_short bytes, and f2fs_acl_from_disk() then reads entry->e_id before verifying that a full entry fits.

Require a short entry before reading e_tag and e_perm, and require a full entry before reading e_id for ACL_USER and ACL_GROUP. Return -EFSCORRUPTED from these new truncated-entry checks, while keeping the pre-existing -EINVAL paths unchanged.

Validation reproduced this kernel report: KASAN slab-out-of-bounds in __f2fs_get_acl+0x6fb/0x7e0 RIP: 0033:0x7f4b835ea7aa The buggy address belongs to the object at ffff888114589960 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 8-byte region [ffff888114589960, ffff888114589968) Read of size 4 Call trace: dump_stack_lvl+0x66/0xa0 (?:?) print_report+0xce/0x630 (?:?) __f2fs_get_acl+0x6fb/0x7e0 (fs/f2fs/acl.c:169) srso_alias_return_thunk+0x5/0xfbef5 (?:?) __virt_addr_valid+0x224/0x430 (?:?) kasan_report+0xe0/0x110 (?:?) __f2fs_get_acl+0x5/0x7e0 (fs/f2fs/acl.c:169) __get_acl+0x281/0x380 (?:?) vfs_get_acl+0x10b/0x190 (?:?) do_get_acl+0x2a/0x410 (?:?) do_get_acl+0x9/0x410 (?:?) do_getxattr+0xe8/0x260 (?:?) filename_getxattr+0xd1/0x140 (?:?) do_getname+0x2d/0x2d0 (?:?) path_getxattrat+0x16c/0x200 (?:?) lock_release+0xc8/0x290 (?:?) cgroup_update_frozen+0x9d/0x320 (?:?) lockdep_hardirqs_on_prepare+0xea/0x1a0 (?:?) trace_hardirqs_on+0x1a/0x170 (?:?) _raw_spin_unlock_irq+0x28/0x50 (?:?) do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87) entry_SYSCALL_64_after_hwframe+0x77/0x7f (?:?)

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
3%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 17, 2026

Advisory Details (8)

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

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ff83de56882cb8466184d322abece2589258ca56
generic

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c4810ada31e80cbe4011467c4f3b1e93f94134f3
generic

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/aba4f94ac1832c7299c33e1b4fe5f87eef6dc8f1
generic

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/733cd8474e6d763d75ed96f3f2b98a25480cf2b9
generic

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5d8a39649947a4e86c8fbc682d7fc0041b8d109a
generic

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4e2a96ec7236e248e706850568e0a925fd21b588
generic

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/442ca20c54038e2400cf28aaa944cf1de2c8e65d
generic

f2fs: validate ACL entry sizes in f2fs_acl_from_disk() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/1ddf3fd21c4c652f9cab5552515c04a166662306

Vendor Advisories for CVE-2026-63814(2)

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

Patch Availability(3)

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

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—

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 15× in last 7d / 79× 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 169 total refreshes for this CVE.

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

Related CVEs(same vendor)

Frequently asked(5)

What is CVE-2026-63814?
CVE-2026-63814 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: f2fs: validate ACL entry sizes in f2fsaclfrom_disk() f2fsaclcount() only validates the aggregate ACL xattr length. A malformed ACL can still place ACLUSER or ACLGROUP in a slot that only contains struct f2fsaclentryshort bytes, and…
When was CVE-2026-63814 disclosed?
CVE-2026-63814 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-2026-63814 actively exploited?
CVE-2026-63814 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 97.3% of all scored CVEs.
What is the CVSS score of CVE-2026-63814?
CVE-2026-63814 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-63814?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63814, 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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