CVE-2026-98405
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.
Affected versions
Linux kernel versions
6.6.32
and later are affected. Fixed in
6.6.158
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-98405?
CVE-2026-98405 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.32 onward and has been patched in 6.6.158. CVE-2026-98405 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-98405?
Yes. CVE-2026-98405 has been patched. Fixed versions include 6.6.158. If you are running Linux kernel 6.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-98405 actively exploited?
No. CVE-2026-98405 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.