High 8.8Published Jun 21, 2026

CVE-2026-52911ksmbd: scope conn->binding slowpath to bound sessions only

Updated under an hour ago (Oct 28, 2026, 12:50 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ksmbd: scope conn->binding slowpath to bound sessions only When the binding SESSION_SETUP sets conn->binding = true, the flag stays set after the call so that the global session lookup in ksmbd_session_lookup_all() can find the session, which was not added to conn->sessions. Because the flag is connection-wide, the global lookup path will also resolve any other session by id if asked. Tighten the global lookup so that the returned session must have this connection registered in its channel xarray (sess->ksmbd_chann_list). The channel entry is installed by the existing binding_session path in ntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes successfully, so this condition is a strict equivalent of "this connection has been accepted as a channel of this session". Connections that have not bound to a given session cannot reach it via the global table. The existing conn->binding gate for entering the slowpath is preserved so that non-binding connections keep the fast-path-only behavior, and the session->state check is unchanged.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from f5a544e3bab78142207e0242d22442db85ba1eff before e74c00c6af428a39e564cdc5bd3a3648c6d8de87; from f5a544e3bab78142207e0242d22442db85ba1eff before e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a; from f5a544e3bab78142207e0242d22442db85ba1eff before 1ff46c9915c1cbf454db58a8cb87f7cac818e6a6; from f5a544e3bab78142207e0242d22442db85ba1eff before 974c1c224e85549dc3459f3bb2255bbbdd2b9372; from f5a544e3bab78142207e0242d22442db85ba1eff before 2cc8a4db633b10715450b291c1343859a4b2c509; from f5a544e3bab78142207e0242d22442db85ba1eff before 1e2bec062c5c9ec282636715166056d0998d746d; from f5a544e3bab78142207e0242d22442db85ba1eff before b0da97c034b6107d14e537e212d4ce8b22109a58	CNA record
linux linux_kernel linux:linux_kernel	from 5.15 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10	NVD

References

References

https://git.kernel.org/stable/c/e74c00c6af428a39e564cdc5bd3a3648c6d8de87	patch
https://git.kernel.org/stable/c/e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a	patch
https://git.kernel.org/stable/c/1ff46c9915c1cbf454db58a8cb87f7cac818e6a6	patch
https://git.kernel.org/stable/c/974c1c224e85549dc3459f3bb2255bbbdd2b9372	patch
https://git.kernel.org/stable/c/2cc8a4db633b10715450b291c1343859a4b2c509	patch
https://git.kernel.org/stable/c/1e2bec062c5c9ec282636715166056d0998d746d	patch
https://git.kernel.org/stable/c/b0da97c034b6107d14e537e212d4ce8b22109a58	patch

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.