cifs: validate idmap key payload length
In the Linux kernel, the following vulnerability has been resolved: cifs: validate idmap key payload length The cifs.idmap key type stores its payload length in key->datalen, which is limited to U16_MAX. Accepting a larger key payload truncates the recorded length and can make later users interpret the payload using inconsistent bounds. Reject oversized preparsed payloads before allocating or copying them. This keeps key->datalen consistent with the stored data for both inline and separately allocated idmap payloads.
CVE-2026-93785
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93785
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
"lessThan": "eeac976b74b4f697cfc517187b7cbfd72652dbbc",
"versionType": "git"
},
{
"status": "affected",
"version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
"lessThan": "125b05ac8ca8758950e4369c1542d57a162f504c",
"versionType": "git"
},
{
"status": "affected",
"version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
"lessThan": "945f6cde6bcf8f08f6fa5df8882b1b9582e55efa",
"versionType": "git"
},
{
"status": "affected",
"version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
"lessThan": "3a4a34a732e8a08309eed0a74314dbd9f2f1c972",
"versionType": "git"
},
{
"status": "affected",
"version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
"lessThan": "6cfeef221ac00d63c07f6122f58e6159bde69ca0",
"versionType": "git"
},
{
"status": "affected",
"version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
"lessThan": "8b12f65d7caf16d124098cb4895a203367d35b57",
"versionType": "git"
},
{
"status": "affected",
"version": "21fed0d5b763b94a7d1568c27d0cce892ab8d43e",
"lessThan": "455488cd5054bcc59db40fa1cc2c004031a5b2a5",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/cifsacl.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/cifsacl.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93785
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #8263 · Revision 1
- Added to Heist Feed
- Publisher date