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CVE-2026-72318

CRITICALCVSS 9.4/10EPSS 0.21%

Last modified

CVE-2026-72318 is a critical-severity vulnerability rated 9.4/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
9.4/10

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

EPSS Probability
0.21%

12.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < 76c607b9353d377b1d1b11db50e743eee0ccf658; >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < d64b6be5740ce230aca184d8d224c75d9866045d; >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < 929a85932d14190988f1eafd6ee8cc68d66ace0b; >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < b784cd1c24d89bf71be2efe1e948ff7c03371e57; >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < c37abc99bb3de3d3219ecef253d649f74117fd83; >= 4ecce920e13ace16a5ba45efe8909946c28fb2ad, < 027a84ac6b50c12ef767c15abfc58aa865820e9e
LinuxLinux4.11

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72318?
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.
How severe is CVE-2026-72318?
CVE-2026-72318 has a CVSS score of 9.4/10 (CRITICAL severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72318?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST