CVE-2024-26692smb: Fix regression in writes when non-standard maximum write size negotiated
- 8.3HighCVSS base score
- 0.53%Exploitation in 30 daysEPSS · top 54% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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).
Timeline
ID reserved
By Linux
- 44 days later
· 44 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.53% · top 54% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.3.
Affected products
- affected d08089f649a0cfb2099c8551ac47eef0cc23fdf2 – < 4145ccff546ea868428b3e0fe6818c6261b574a9
- affected d08089f649a0cfb2099c8551ac47eef0cc23fdf2 – < 63c35afd50e28b49c5b75542045a8c42b696dab9
- affected d08089f649a0cfb2099c8551ac47eef0cc23fdf2 – < 4860abb91f3d7fbaf8147d54782149bb1fc45892
- affected 6.3
- unaffected < 6.3
- unaffected 6.6.18 – ≤ 6.6.*
- unaffected 6.7.6 – ≤ 6.7.*
- unaffected 6.8 – ≤ *
References
References3
- https://git.kernel.org/stable/c/4145ccff546ea868428b3e0fe6818c6261b574a9 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/63c35afd50e28b49c5b75542045a8c42b696dab9 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/4860abb91f3d7fbaf8147d54782149bb1fc45892 (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-23954 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-26692)Record last updated .