Skip to content
CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-97554

smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr()

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid using uninitialized SIDs in cifs_posix_to_fattr() cifs_posix_to_fattr() ignores the return value of posix_info_parse(). When a malformed POSIX directory entry is encountered (e.g. invalid SID lengths from an untrusted server), posix_info_parse() returns -1 without populating the 'parsed' struct. The uninitialized stack memory in parsed.owner and parsed.group is then passed to sid_to_id(), which processes the garbage bytes and passes them to request_key() to construct a SID string, potentially leaking kernel stack contents to the userspace idmap daemon. Fix this by checking the return value and skipping the SID-to-id mapping when parsing fails. The remaining fattr fields (timestamps, mode, etc.) are populated directly from the 'info' pointer so they are unaffected.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 9934430e2178d5164eb1ac91a9b092f9e7e64745 to < 1915b69e36906968e2b698699d0f219875ae846eaffected
  • 9934430e2178d5164eb1ac91a9b092f9e7e64745 to < 604feb3e8141bf11f5afd48d36d401fee5af9536affected
  • 9934430e2178d5164eb1ac91a9b092f9e7e64745 to < 33106019c3be57b5fc6411cfaad6d98214a51265affected
  • 9934430e2178d5164eb1ac91a9b092f9e7e64745 to < 2be31f252ade791b84f7164991f14436aed1d4b9affected
  • 9934430e2178d5164eb1ac91a9b092f9e7e64745 to < c9a8b60ce140a68d172452f418137fc7ddbae7dbaffected
  • 9934430e2178d5164eb1ac91a9b092f9e7e64745 to < da6e25842431982d5a53cf00d925b98c690f4467affected
  • dd80b98bdf0a4b3206739f3513b0518f27a7b4efaffected
  • d8e39c11f66125f49de55537a6efc8ecadf4a0f7affected
  • 5.8.17 to < 5.9affected
  • 5.9.2 to < 5.10affected

Linux Linux

Default version status: affected

  • 5.10affected
  • 0 to < 5.10unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 7.2.7 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References