CVE-2024-26692 (GCVE-0-2024-26692)

Vulnerability from cvelistv5 – Published: 2024-04-03 14:54 – Updated: 2025-05-04 08:54
VLAI?
Title
smb: Fix regression in writes when non-standard maximum write size negotiated
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: Fix regression in writes when non-standard maximum write size negotiated The conversion to netfs in the 6.3 kernel caused a regression when maximum write size is set by the server to an unexpected value which is not a multiple of 4096 (similarly if the user overrides the maximum write size by setting mount parm "wsize", but sets it to a value that is not a multiple of 4096). When negotiated write size is not a multiple of 4096 the netfs code can skip the end of the final page when doing large sequential writes, causing data corruption. This section of code is being rewritten/removed due to a large netfs change, but until that point (ie for the 6.3 kernel until now) we can not support non-standard maximum write sizes. Add a warning if a user specifies a wsize on mount that is not a multiple of 4096 (and round down), also add a change where we round down the maximum write size if the server negotiates a value that is not a multiple of 4096 (we also have to check to make sure that we do not round it down to zero).
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < 4145ccff546ea868428b3e0fe6818c6261b574a9 (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < 63c35afd50e28b49c5b75542045a8c42b696dab9 (git)
Affected: d08089f649a0cfb2099c8551ac47eef0cc23fdf2 , < 4860abb91f3d7fbaf8147d54782149bb1fc45892 (git)
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    Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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