CVE-2026-63816

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 — 3 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: atomic: fix UAF issue on f2fs_inode_info.atomic_inode

  • ioctl(F2FS_IOC_GARBAGE_COLLECT_RANGE) - shrink
  • f2fs_gc
  • gc_data_segment
  • ra_data_block(cow_inode)
  • mapping = F2FS_I(inode)->atomic_inode->i_mapping
: f2fs_is_cow_file(cow_inode) is true
  • f2fs_evict_inode(atomic_inode)
  • clear_inode_flag(fi->cow_inode, FI_COW_FILE)
  • F2FS_I(fi->cow_inode)->atomic_inode = NULL
...
  • truncate_inode_pages_final(atomic_inode)
  • f2fs_grab_cache_folio(mapping)
: create folio in atomic_inode->mapping
  • clear_inode(atomic_inode)
  • BUG_ON(atomic_inode->i_data.nrpages)

We need to add a reference on fi->atomic_inode before using its mapping field during garbage collection, otherwise, it will cause UAF issue.

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 (4)

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

f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e0288584baa5dc41df4a829a023c4c1b33fe53d7
generic

f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a805fec35c201c59643ddcde713bce4051c8ee27
generic

f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a499f77c06050a28c897bdbd86cd2f0721ae0743
generic

f2fs: atomic: fix UAF issue on f2fs_inode_info.atomic_inode - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/56038756aae68312df00d4aa1d97e51ef3aca725

Vendor Advisories for CVE-2026-63816(2)

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

Affected Packages

(4 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 7.2~rc5-1~exp1 (338 versions)——
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 (154 versions)7.1.3-1—

Data Freshness Timeline

(refreshed 22× in last 7d / 106× 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 147 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-63816?
CVE-2026-63816 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: f2fs: atomic: fix UAF issue on f2fsinodeinfo.atomic_inode ioctl(F2FSIOCGARBAGECOLLECTRANGE) - shrink f2fs_gc gcdatasegment radatablock(cow_inode) - mapping = F2FSI(inode)->atomicinode->i_mapping : f2fsiscowfile(cowinode) is true -…
When was CVE-2026-63816 disclosed?
CVE-2026-63816 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-2026-63816 actively exploited?
CVE-2026-63816 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 97.4% of all scored CVEs.
What is the CVSS score of CVE-2026-63816?
CVE-2026-63816 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-63816?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63816, 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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