High 8.1Published Oct 14, 2026

CVE-2026-98405smb: client: fix missing iov bounds check in parse_posix_sids()

Updated under an hour ago (Oct 26, 2026, 11:50 PM ET)

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EPSS puts the chance of exploitation in the next 30 days at 0.21%, higher than 10% of scored CVEs.

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Exploited in the last 30 days

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: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.21% (percentile 10)
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 24, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a90f37e3d7acfd9824f162830583bbf7846fe252 before d91b9a3b2b38e5ac1b51e9e5b23fe53ad7b49644; from 858e74876c5cbff1dfd5bace99e32fbce2abd4b5 before b862996e5105be1293da9cdc85da77b76021c3bd; 858e74876c5cbff1dfd5bace99e32fbce2abd4b5 builds before 2f8ed71aaaba3bc8b19cd9930cc62e63e142b299; from 858e74876c5cbff1dfd5bace99e32fbce2abd4b5 before eac6917a42899aad0617bbf04798c5dd946a1fe5; from 858e74876c5cbff1dfd5bace99e32fbce2abd4b5 before b09d092eb24ad0110f16a9b7c1ed5d2a0c1733dc; from 6.6.32 before 6.6.158	CNA record

References

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.