CVE-2026-63814

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH 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

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:

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(high)
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

July 20, 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.

Data Freshness Timeline

(refreshed 23× in last 7d / 26× 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.

  1. 2026-07-27 14:14 UTCEPSS rescore
  2. 2026-07-27 13:21 UTCGHSA enrichment
  3. 2026-07-27 00:15 UTCEG score recompute
  4. 2026-07-27 00:15 UTCGHSA enrichment
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-26 11:09 UTCEG score recompute
  8. 2026-07-26 11:08 UTCGHSA enrichment
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-25 14:18 UTCEPSS rescore
  11. 2026-07-24 14:18 UTCEPSS rescore
  12. 2026-07-24 14:18 UTCEPSS rescore
  13. 2026-07-23 03:22 UTCEG score recompute
  14. 2026-07-22 14:08 UTCEPSS rescore
  15. 2026-07-22 14:08 UTCEPSS rescore
  16. 2026-07-21 15:25 UTCEPSS rescore
  17. 2026-07-21 15:25 UTCEPSS rescore
  18. 2026-07-20 17:45 UTCEG score recompute
  19. 2026-07-20 17:45 UTCGHSA enrichment
  20. 2026-07-20 17:08 UTCEPSS rescore
  21. 2026-07-20 14:44 UTCEG score recompute▲ 7.80
  22. 2026-07-20 14:44 UTCGHSA enrichment
  23. 2026-07-20 14:32 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  24. 2026-07-19 12:26 UTCNVD update
  25. 2026-07-19 12:14 UTCEG score recompute
Show 1 more
  1. 2026-07-19 12:10 UTCMITRE cvelistV5first tracked

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 July 20, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-63814

Explore →

Is Your Infrastructure Affected by CVE-2026-63814?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs