CVE-2026-64391
criticalIn the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for ADS I/O Alternate data streams are stored as xattrs.
Vendor / product: Linux — linux kernel
In the Linux kernel, the following vulnerability has been resolved: ksmbd: use opener credentials for ADS I/O Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials. Run ADS I/O with the credentials captured when the SMB handle was opened.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
Timeline (UTC)
Published: 2026-07-25 10:17
Modified: 2026-10-30 13:19
NVD status: Modified
Last synced 1 day ago
Verified against the source API 2026-11-03 07:34 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
linux / linux_kernel ≥5.15 <6.12.96, ≥6.13 <6.18.39, ≥6.19 <7.1.4
Weakness classification (CWE)
NVD-CWE-noinfo
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab
Patch / mitigation: https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce
Patch / mitigation: https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d
Patch / mitigation: https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c
References
- https://git.kernel.org/stable/c/222c4c52c3af2d0f68de31182710df3508a31095 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/2ad5509dd576ae16d252d4698daf03002f9e0234 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:34 UTC · record ↗