CVE-2023-53597
cifs: fix mid leak during reconnection after timeout threshold
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: cifs: fix mid leak during reconnection after timeout threshold When the number of responses with status of STATUS_IO_TIMEOUT exceeds a specified threshold (NUM_STATUS_IO_TIMEOUT), we reconnect the connection. But we do not return the mid, or the credits returned for the mid, or reduce the number of in-flight requests. This bug could result in the server->in_flight count to go bad, and also cause a leak in the mids. This change moves the check to a few lines below where the response is decrypted, even of the response is read from the transform header. This way, the code for returning the mids can be reused. Also, the cifs_reconnect was reconnecting just the transport connection before. In case of multi-channel, this may not be what we want to do after several timeouts. Changed that to reconnect the session and the tree too. Also renamed NUM_STATUS_IO_TIMEOUT to a more appropriate name MAX_STATUS_IO_TIMEOUT.
Timeline
ID reserved
By Linux
Published
- 10 months later
· 10 months 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 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
- 0.29% · top 79% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- affected 8e670f77c4a55013db6d23b962f9bf6673a5e7b6 – < df31d05f0678cdd0796ea19983a2b93edca18bb0
- affected 8e670f77c4a55013db6d23b962f9bf6673a5e7b6 – < c55901d381a22300c9922170e59704059f50977b
- affected 8e670f77c4a55013db6d23b962f9bf6673a5e7b6 – < 57d25e9905c71133e201f6d06b56a3403d4ad433
- affected 8e670f77c4a55013db6d23b962f9bf6673a5e7b6 – < 69cba9d3c1284e0838ae408830a02c4a063104bc
- affected fa6d7a5853f93efb088aba36af12cb1944156411
- affected 5.9.5 – < 5.10
- affected 5.10
- unaffected < 5.10
- unaffected 5.15.150 – ≤ 5.15.*
- unaffected 6.1.42 – ≤ 6.1.*
- unaffected 6.4.7 – ≤ 6.4.*
- unaffected 6.5 – ≤ *
References (4)
- https://git.kernel.org/stable/c/df31d05f0678cdd0796ea19983a2b93edca18bb0 (opens in a new tab)
- https://git.kernel.org/stable/c/c55901d381a22300c9922170e59704059f50977b (opens in a new tab)
- https://git.kernel.org/stable/c/57d25e9905c71133e201f6d06b56a3403d4ad433 (opens in a new tab)
- https://git.kernel.org/stable/c/69cba9d3c1284e0838ae408830a02c4a063104bc (opens in a new tab)
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)
- 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://trackcve.app/cve/CVE-2023-53597)Record last updated .