smb: client: reject userspace cifs.idmap descriptions
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.idmap descriptions cifs.idmap key descriptions carry authority-bearing fields (owner and group SIDs and uid/gid values in "os:"/"gs:"/"oi:"/"gi:" form) that the cifs.idmap upcall helper treats as kernel-originating inputs. Unlike its sibling cifs.spnego, the cifs.idmap key type has no vet_description hook, so userspace can create keys of this type through request_key(2)/add_key(2) and supply those fields without CIFS origin. A request_key(2) call with a non-NULL callout then drives a root usermodehelper upcall (/sbin/request-key -> cifs.idmap) that consumes the unvetted description in root context. Only accept cifs.idmap descriptions while CIFS is using its private root_cred to request the key. id_to_sid()/sid_to_id() already run under override_creds(root_cred), so the kernel-originated path is unaffected. This mirrors commit 3da1fdf4efbc ("smb: client: reject userspace cifs.spnego descriptions"), which applied the same restriction to cifs.spnego.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 4d79dba0e00749fa40de8ef13a9b85ce57a1603b · fixed in f29c1ec0e7d8c887a91df3f93bb4617c0ac95c6a; From 4d79dba0e00749fa40de8ef13a9b85ce57a1603b · fixed in 17c93bcd17755523c21abb22cbf2a41a6eb0caaf; From 4d79dba0e00749fa40de8ef13a9b85ce57a1603b · fixed in e5964064e3fbe6325893408faff08ca33de0e2c3; From 4d79dba0e00749fa40de8ef13a9b85ce57a1603b · fixed in 96751028c0d4dec785709ea3eb0ab38a4f2ded96; From 4d79dba0e00749fa40de8ef13a9b85ce57a1603b · fixed in 1d3b24b16a0b013792e8f1e3ed060f0b46f537d1; From 4d79dba0e00749fa40de8ef13a9b85ce57a1603b · fixed in d9d7eeb0cea5b55b82888f443622fd8d4ee064f3
- Linux Linux
3.0
- KernelLinux
From 3.0.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.13.0 · fixed in 6.18.53; From 6.19.0 · fixed in 7.2.7