CVE-2026-98405smb: client: fix missing iov bounds check in parse_posix_sids()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: smb: client: fix missing iov bounds check in parse_posix_sids() In parse_posix_sids(), sidsbuf_end is calculated using the server-supplied out_len without being validated against the actual length of the received iov (iov_len). If a server provides an inflated out_len, sidsbuf_end will point past the end of the iov. This defeats the bounds guards in posix_info_sid_size(), allowing out-of-bounds reads into adjacent kernel memory. Fix this by rejecting responses where the calculated sidsbuf_end would exceed the received iov boundaries or cause pointer wraparound.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Linux Linux linux:linux (from the name) | from a90f37e3d7acfd9824f162830583bbf7846fe252 before d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644; from a90f37e3d7acfd9824f162830583bbf7846fe252 before b862996e5105be1293da9cdc85da77b76021c3bd; from a90f37e3d7acfd9824f162830583bbf7846fe252 before 2f8ed71aaaba3bc8b19cd9930cc62e63e142b299; from a90f37e3d7acfd9824f162830583bbf7846fe252 before eac6917a42899aad0617bbf04798c5dd946a1fe5; from a90f37e3d7acfd9824f162830583bbf7846fe252 before b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc | CNA record |
References
- https://git.kernel.org/stable/c/d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644
- https://git.kernel.org/stable/c/b862996e5105be1293da9cdc85da77b76021c3bd
- https://git.kernel.org/stable/c/2f8ed71aaaba3bc8b19cd9930cc62e63e142b299
- https://git.kernel.org/stable/c/eac6917a42899aad0617bbf04798c5dd946a1fe5
- https://git.kernel.org/stable/c/b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.