CVE-2026-31476ksmbd: do not expire session on binding failure
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: ksmbd: do not expire session on binding failure When a multichannel session binding request fails (e.g. wrong password), the error path unconditionally sets sess->state = SMB2_SESSION_EXPIRED. However, during binding, sess points to the target session looked up via ksmbd_session_lookup_slowpath() -- which belongs to another connection's user. This allows a remote attacker to invalidate any active session by simply sending a binding request with a wrong password (DoS). Fix this by skipping session expiration when the failed request was a binding attempt, since the session does not belong to the current connection. The reference taken by ksmbd_session_lookup_slowpath() is still correctly released via ksmbd_user_session_put().
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Aug 5, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from f5a544e3bab78142207e0242d22442db85ba1eff before 4642ea35c03cf3d3558c009df4757cdb7af3f82d; from f5a544e3bab78142207e0242d22442db85ba1eff before f5300690c23c5ac860499bb37dbc09cf43fd62e6; from f5a544e3bab78142207e0242d22442db85ba1eff before 6fafc4c4238e538969f1375f9ecdc6587c53f1cc; from f5a544e3bab78142207e0242d22442db85ba1eff before 1d1888b4a7aec518b707f6eca0bf08992c0e8da3; from f5a544e3bab78142207e0242d22442db85ba1eff before a897064a457056acb976e20e3007cdf553de340f; from f5a544e3bab78142207e0242d22442db85ba1eff before e0e5edc81b241c70355217de7e120c97c3429deb; from f5a544e3bab78142207e0242d22442db85ba1eff before 9bbb19d21ded7d78645506f20d8c44895e3d0fb9 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.15.1 before 6.1.168; from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 5.15; 7.0; 7.0; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/4642ea35c03cf3d3558c009df4757cdb7af3f82d
- https://git.kernel.org/stable/c/f5300690c23c5ac860499bb37dbc09cf43fd62e6patch
- https://git.kernel.org/stable/c/6fafc4c4238e538969f1375f9ecdc6587c53f1ccpatch
- https://git.kernel.org/stable/c/1d1888b4a7aec518b707f6eca0bf08992c0e8da3patch
- https://git.kernel.org/stable/c/a897064a457056acb976e20e3007cdf553de340fpatch
- https://git.kernel.org/stable/c/e0e5edc81b241c70355217de7e120c97c3429debpatch
- https://git.kernel.org/stable/c/9bbb19d21ded7d78645506f20d8c44895e3d0fb9patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.