CVE-2026-23205smb/client: fix memory leak in smb2_open_file()
- 5.5MediumCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% 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/client: fix memory leak in smb2_open_file() Reproducer: 1. server: directories are exported read-only 2. client: mount -t cifs //${server_ip}/export /mnt 3. client: dd if=/dev/zero of=/mnt/file bs=512 count=1000 oflag=direct 4. client: umount /mnt 5. client: sleep 1 6. client: modprobe -r cifs The error message is as follows: ============================================================================= BUG cifs_small_rq (Not tainted): Objects remaining on __kmem_cache_shutdown() ----------------------------------------------------------------------------- Object 0x00000000d47521be @offset=14336 ... WARNING: mm/slub.c:1251 at __kmem_cache_shutdown+0x34e/0x440, CPU#0: modprobe/1577 ... Call Trace: <TASK> kmem_cache_destroy+0x94/0x190 cifs_destroy_request_bufs+0x3e/0x50 [cifs] cleanup_module+0x4e/0x540 [cifs] __se_sys_delete_module+0x278/0x400 __x64_sys_delete_module+0x5f/0x70 x64_sys_call+0x2299/0x2ff0 do_syscall_64+0x89/0x350 entry_SYSCALL_64_after_hwframe+0x76/0x7e ... kmem_cache_destroy cifs_small_rq: Slab cache still has objects when called from cifs_destroy_request_bufs+0x3e/0x50 [cifs] WARNING: mm/slab_common.c:532 at kmem_cache_destroy+0x16b/0x190, CPU#0: modprobe/1577
Timeline
ID reserved
By Linux
- 32 days later
· 32 days later
Published
- 3 months later
· 3 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 |
|---|---|---|---|
| NVDNVD · Analyzed | 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)
- 0.14% · top 97% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 17e53a15e64b65623b8f2b1185d27d7b1cbf69ab – < 743f70406264348c0830f38409eb6c40a42fb2db
- affected 18066188eb90cc0c798f3370a8078a79ddb73f70 – < 3a6d6b332f92990958602c1e35ce0173e2dd62e9
- affected 6ebb9d54eccc8026b386e76eff69364d33373da5 – < b64e3b5d8d759dd4333992e4ba4dadf9359952c8
- affected e255612b5ed9f179abe8196df7c2ba09dd227900 – < 9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5
- affected e255612b5ed9f179abe8196df7c2ba09dd227900 – < e3a43633023e3cacaca60d4b8972d084a2b06236
- affected bcd15f06c7e8904116cfb06526bcc189b86aff85
- affected 6.1.141 – < 6.1.163
- affected 6.6.93 – < 6.6.124
- affected 6.12.31 – < 6.12.70
- affected 6.14.9 – < 6.15
- affected 6.15
- unaffected < 6.15
- unaffected 6.1.163 – ≤ 6.1.*
- unaffected 6.6.124 – ≤ 6.6.*
- unaffected 6.12.70 – ≤ 6.12.*
- unaffected 6.18.10 – ≤ 6.18.*
- unaffected 6.19 – ≤ *
References
References5
- https://git.kernel.org/stable/c/743f70406264348c0830f38409eb6c40a42fb2db (opens in a new tab)
- https://git.kernel.org/stable/c/3a6d6b332f92990958602c1e35ce0173e2dd62e9 (opens in a new tab)
- https://git.kernel.org/stable/c/b64e3b5d8d759dd4333992e4ba4dadf9359952c8 (opens in a new tab)
- https://git.kernel.org/stable/c/9ee608a64e37cea5b4b13e436c559dd0fb2ad1b5 (opens in a new tab)
- https://git.kernel.org/stable/c/e3a43633023e3cacaca60d4b8972d084a2b06236 (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)
- EUVD EUVD-2026-5840 (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-2026-23205)Record last updated .