cifs: validate DFS referral string offsets

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72318
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:04 UTC
Updated2026-08-17 06:18:35 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.4 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

EPSS: 0.005860000 probability, percentile 0.452350000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.4CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
3.1CNADECLARED9.4CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4ecce920e13ace16a5ba45efe8909946c28fb2ad 76c607b9353d377b1d1b11db50e743eee0ccf658 git Not specified
CNA Linux Linux affected 4ecce920e13ace16a5ba45efe8909946c28fb2ad d64b6be5740ce230aca184d8d224c75d9866045d git Not specified
CNA Linux Linux affected 4ecce920e13ace16a5ba45efe8909946c28fb2ad 929a85932d14190988f1eafd6ee8cc68d66ace0b git Not specified
CNA Linux Linux affected 4ecce920e13ace16a5ba45efe8909946c28fb2ad b784cd1c24d89bf71be2efe1e948ff7c03371e57 git Not specified
CNA Linux Linux affected 4ecce920e13ace16a5ba45efe8909946c28fb2ad c37abc99bb3de3d3219ecef253d649f74117fd83 git Not specified
CNA Linux Linux affected 4ecce920e13ace16a5ba45efe8909946c28fb2ad 027a84ac6b50c12ef767c15abfc58aa865820e9e git Not specified
CNA Linux Linux affected 4.11 Not specified
CNA Linux Linux unaffected 4.11 semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b784cd1c24d89bf71be2efe1e948ff7c03371e57 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d64b6be5740ce230aca184d8d224c75d9866045d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c37abc99bb3de3d3219ecef253d649f74117fd83 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76c607b9353d377b1d1b11db50e743eee0ccf658 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/027a84ac6b50c12ef767c15abfc58aa865820e9e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/929a85932d14190988f1eafd6ee8cc68d66ace0b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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