CVE-2026-97562
- Source
- https://cve.org/CVERecord?id=CVE-2026-97562
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-97562.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-97562
- Downstream
- Published
- 2026-09-25T10:21:50Z
- Modified
- 2026-09-26T03:48:27Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- smb: client: pin DFS superblock in iterator callback
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
smb: client: pin DFS superblock in iterator callback
tcon_super_cb() stores a raw superblock pointer, but __cifs_get_super() takes its active reference only after iterate_supers_type() has dropped s_umount and its passive reference. Concurrent DFS automount expiry can therefore free the superblock before cifs_sb_active() uses it.
A deterministic KASAN test reproduces the race as:
BUG: KASAN: slab-use-after-free in cifs_sb_active+0x77/0x80
The same test passes with this change applied.
Take the active reference in the callback while iterate_supers_type() still holds s_umount shared. cifs_put_tcp_super() remains the matching release.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97562.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/5b01a8c0209690db75341528ec53fd87e0ac1460
- https://git.kernel.org/stable/c/a6b6561522212af852c9ad8a7dca8d59ef2c7377
- https://git.kernel.org/stable/c/d806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818
- https://git.kernel.org/stable/c/ea43a15cea36dc5ddd832be5bddeac7dd804cbcf
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/97xxx/CVE-2026-97562.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-97562
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedbacd704a95ad0b93af995aae4a523aa046f46563Fixedea43a15cea36dc5ddd832be5bddeac7dd804cbcfFixeda6b6561522212af852c9ad8a7dca8d59ef2c7377Fixed5b01a8c0209690db75341528ec53fd87e0ac1460Fixedd806d5a85dcbe2a0f181b2f0f9f61ddfbefa1818