CVE-2026-63833

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-19. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: 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:

ntfs3: reject direct userspace writes to reserved $LX* xattrs

NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL permission metadata and reloads them into i_uid, i_gid and i_mode from ntfs_get_wsl_perm().

Because the empty-prefix xattr handler also lets file owners call setxattr() on these names directly, an unprivileged writer on a writable ntfs3 mount can plant root ownership and S_ISUID on their own file and gain euid 0 after inode reload.

Reject direct userspace writes to the reserved $LX* names. Internal ntfs3 metadata updates are unchanged because ntfs_save_wsl_perm() writes them via ntfs_set_ea() directly.

[[email protected]: added an additional check for non privileged users]

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

July 19, 2026

Last Modified

August 17, 2026

Advisory Details (7)

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

ntfs3: reject direct userspace writes to reserved $LX* xattrs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f8d420949b335a4b51d06ab276beee6b8dfdc909
generic

ntfs3: reject direct userspace writes to reserved $LX* xattrs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e8852ae29868e449fdb47eebc28f35fb80741a5f
generic

ntfs3: reject direct userspace writes to reserved $LX* xattrs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/e574af95234afc3c725988bbc1fdeb46b9f386a4
generic

ntfs3: reject direct userspace writes to reserved $LX* xattrs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5e658b9245a52d838ef93729a7bc07de8e19deb7
generic

ntfs3: reject direct userspace writes to reserved $LX* xattrs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/5b08dccecf825cbf905f348bc6ccb497507e28e2
generic

ntfs3: reject direct userspace writes to reserved $LX* xattrs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2c3cd6da4a14380ef79e34bd9dff7caf46687477
generic

ntfs3: reject direct userspace writes to reserved $LX* xattrs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/293a84fa40b3a1b3471c0545722724bc10973f76

Vendor Advisories for CVE-2026-63833(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 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
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 (153 versions)7.1.3-1—

Data Freshness Timeline

(refreshed 21× in last 7d / 110× 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 335 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-63833?
CVE-2026-63833 is a high vulnerability published on July 19, 2026. In the Linux kernel, the following vulnerability has been resolved: ntfs3: reject direct userspace writes to reserved $LX* xattrs NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL permission metadata and reloads them into iuid, igid and i_mode from ntfsgetwsl_perm(). Because the…
When was CVE-2026-63833 disclosed?
CVE-2026-63833 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-2026-63833 actively exploited?
CVE-2026-63833 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 97.5% of all scored CVEs.
What is the CVSS score of CVE-2026-63833?
CVE-2026-63833 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-63833?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63833, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-63833

Explore →

Is Your Infrastructure Affected by CVE-2026-63833?

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

Start Free Scan →Browse All CVEs