cifs: validate DFS referral string offsets
In the Linux kernel, the following vulnerability has been resolved: cifs: validate DFS referral string offsets parse_dfs_referrals() validates that the response header and referral array fit in the received buffer, but each referral also contains string offsets supplied by the server. Those offsets are used to compute the DfsPath and NetworkAddress string pointers without checking whether they still point inside the response buffer. A malformed referral can therefore make the computed pointer exceed the end of the buffer. The resulting negative max_len is then passed to cifs_strndup_from_utf16(), and the non-Unicode path forwards it to kstrndup() as a size_t, allowing strnlen() to read out of bounds. Validate each string offset before deriving the string pointer.
CVE-2026-72318
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-2026-72318
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": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
"lessThan": "76c607b9353d377b1d1b11db50e743eee0ccf658",
"versionType": "git"
},
{
"status": "affected",
"version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
"lessThan": "d64b6be5740ce230aca184d8d224c75d9866045d",
"versionType": "git"
},
{
"status": "affected",
"version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
"lessThan": "929a85932d14190988f1eafd6ee8cc68d66ace0b",
"versionType": "git"
},
{
"status": "affected",
"version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
"lessThan": "b784cd1c24d89bf71be2efe1e948ff7c03371e57",
"versionType": "git"
},
{
"status": "affected",
"version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
"lessThan": "c37abc99bb3de3d3219ecef253d649f74117fd83",
"versionType": "git"
},
{
"status": "affected",
"version": "4ecce920e13ace16a5ba45efe8909946c28fb2ad",
"lessThan": "027a84ac6b50c12ef767c15abfc58aa865820e9e",
"versionType": "git"
}
],
"programFiles": [
"fs/smb/client/misc.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/smb/client/misc.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72318
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33020 · Revision 1
- Added to Heist Feed
- Publisher date