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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.59%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.4 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
- EPSS
- 0.59% probability · 46th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/027a84ac6b50c12ef767c15abfc58aa865820e9e
- https://git.kernel.org/stable/c/76c607b9353d377b1d1b11db50e743eee0ccf658
- https://git.kernel.org/stable/c/929a85932d14190988f1eafd6ee8cc68d66ace0b
- https://git.kernel.org/stable/c/b784cd1c24d89bf71be2efe1e948ff7c03371e57
- https://git.kernel.org/stable/c/c37abc99bb3de3d3219ecef253d649f74117fd83
- https://git.kernel.org/stable/c/d64b6be5740ce230aca184d8d224c75d9866045d
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.