7.1

CVE-2026-63833: linux

CVSS: 7.1v3.1HighAwaiting analysis
AliasesUBUNTU-CVE-2026-63833DEBIAN-CVE-2026-63833
Published 19-07-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-63833 is a high (CVSS 7.1) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 1.9% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 21 · Related 20
MGASA-2026-0312OPENSUSE-SU-2026:11339-1USN-8726-1USN-8726-2USN-8726-3USN-8726-4

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

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. [almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.177-1 | < 6.12.95-1 | < 7.1.3-1
Linux1 product
  • linux≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < e574af95234afc3c725988bbc1fdeb46b9f386a4 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < 2c3cd6da4a14380ef79e34bd9dff7caf46687477 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < e8852ae29868e449fdb47eebc28f35fb80741a5f | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < f8d420949b335a4b51d06ab276beee6b8dfdc909 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < 5e658b9245a52d838ef93729a7bc07de8e19deb7 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < 293a84fa40b3a1b3471c0545722724bc10973f76 | ≥ be71b5cba2e6485e8959da7a9f9a44461a1bb074, < 5b08dccecf825cbf905f348bc6ccb497507e28e2 | 5.15

3 vendors · 171 products

References

31 links
Show all 31 references