CVE-2026-90152

smb/server: fix session leak in ksmbd_session_register()

Published Sep 17, 2026 CVSS n/a EPSS < 1% KEV · Not listed

Description

In the Linux kernel, the following vulnerability has been resolved:

smb/server: fix session leak in ksmbd_session_register()

See the procedure below:

smb2_sess_setup
ksmbd_smb2_session_create
__session_create
atomic_set(&sess->refcnt, 2)
hash_add(sessions_table, &sess->hlist, sess->id)
ksmbd_session_register
xa_store(&conn->sessions, sess->id, sess) // fail
ksmbd_user_session_put
atomic_dec(&sess->refcnt) // refcnt is 1, session is not freed

Remove the session from sessions_table and drop its table reference if
xa_store() fails.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`f623f627ad2b1dc215ab3b0df53fb05cfd3a1c3b`	affected	< 869807cdd5599c289c21d40f36a504d72a0d23c6
`f5c779b7ddbda30866cf2a27c63e34158f858c73`	affected	< 988f99bfddda4e2d1da5f6e98b237dd85e123cee
`f5c779b7ddbda30866cf2a27c63e34158f858c73`	affected	< 03a22a003f41b182245e6c71fe565e277cff7094
`f5c779b7ddbda30866cf2a27c63e34158f858c73`	affected	< b967a595fb735d313a8676b2ca6a4cba38506482
`f5c779b7ddbda30866cf2a27c63e34158f858c73`	affected	< 55c677619084f9c9fa4146d933cc8ccafc924c87
`f5c779b7ddbda30866cf2a27c63e34158f858c73`	affected	< 99b25b046e47e4904373cfeb445c5483f1633d88
`708c304b583d789957399dd8237f212cf8ad1e4d`	affected	—
`d270631c21e68fb8016d6e231d022d7023a2df6f`	affected	—
`02f41d88f15d6b7d523e52cc3f87488f57e9265b`	affected	—
`6.1.29`	affected	< 6.1.191
`5.15.145`	affected	< 5.16
`6.2.16`	affected	< 6.3
`6.3.2`	affected	< 6.4

Linux

affected

Version	Status	Constraints
`6.4`	affected	—
`0`	unaffected	< 6.4
`6.1.191`	unaffected	≤ 6.1.*
`6.6.160`	unaffected	≤ 6.6.*
`6.12.110`	unaffected	≤ 6.12.*
`6.18.52`	unaffected	≤ 6.18.*
`7.2.6`	unaffected	≤ 7.2.*
`7.3`	unaffected	≤ *

No data.

Vendor Product Versions

Linux

Linux Kernel

Version	Status	Scheme	Platform
`[f5c779b7ddbda30866cf2a27c63e34158f858c73,03a22a003f41b182245e6c71fe565e277cff7094)`	affected	code_commit	—
`[f5c779b7ddbda30866cf2a27c63e34158f858c73,b967a595fb735d313a8676b2ca6a4cba38506482)`	affected	code_commit	—
`[f5c779b7ddbda30866cf2a27c63e34158f858c73,55c677619084f9c9fa4146d933cc8ccafc924c87)`	affected	code_commit	—
`[f5c779b7ddbda30866cf2a27c63e34158f858c73,99b25b046e47e4904373cfeb445c5483f1633d88)`	affected	code_commit	—
`708c304b583d789957399dd8237f212cf8ad1e4d`	affected	code_commit	—
`f623f627ad2b1dc215ab3b0df53fb05cfd3a1c3b`	affected	code_commit	—
`d270631c21e68fb8016d6e231d022d7023a2df6f`	affected	code_commit	—
`02f41d88f15d6b7d523e52cc3f87488f57e9265b`	affected	code_commit	—
`[5.15.145,5.16)`	affected	generic	—
`[6.1.29,6.2)`	affected	generic	—
`[6.2.16,6.3)`	affected	generic	—
`[6.3.2,6.4)`	affected	generic	—

Linux

Linux Kernel

Version	Status	Scheme	Platform
`6.4`	affected	generic	—
`[0,6.4)`	unaffected	generic	—
`[6.12.110,6.13.0)`	unaffected	semver	—
`[6.18.52,6.19.0)`	unaffected	semver	—
`[7.2.6,7.3.0)`	unaffected	semver	—
`[7.3-rc1,*]`	unaffected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
Debian DLA	DLA-4817-1	linux-6.12 security update
Debian DSA	DSA-6528-1	linux security update
Ubuntu USN	USN-9019-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9020-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9022-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9023-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9024-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9025-1	Linux kernel vulnerabilities
Ubuntu USN	USN-9026-1	Linux kernel (Azure) vulnerabilities
Ubuntu USN	USN-9039-1	Linux kernel (Azure CVM) vulnerabilities
Ubuntu USN	USN-9040-1	Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN	USN-9066-1	Linux kernel (HWE) vulnerabilities
Ubuntu USN	USN-9091-1	Linux kernel (NVIDIA Tegra) vulnerabilities

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.215% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/03a22a003f41b182245e6c71fe565e277cff7094
https://git.kernel.org/stable/c/55c677619084f9c9fa4146d933cc8ccafc924c87
https://git.kernel.org/stable/c/869807cdd5599c289c21d40f36a504d72a0d23c6
https://git.kernel.org/stable/c/988f99bfddda4e2d1da5f6e98b237dd85e123cee
https://git.kernel.org/stable/c/99b25b046e47e4904373cfeb445c5483f1633d88
https://git.kernel.org/stable/c/b967a595fb735d313a8676b2ca6a4cba38506482

History

Oct 30, 2026 12:45 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/869807cdd5599c289c21d40f36a504d72a0d23c6

Oct 21, 2026 1:15 PM Added references View changes

Type	Values Removed	Values Added
References		https://git.kernel.org/stable/c/988f99bfddda4e2d1da5f6e98b237dd85e123cee

Sep 20, 2026 2:15 AM Weaknesses updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-459

Sep 17, 2026 4:30 PM Description updated. Title updated. First appearance in the feed. Affected versions updated. Affected vendors updated. Added references View changes

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: smb/server: fix session leak in ksmbd_session_register() See the procedure below: smb2_sess_setup ksmbd_smb2_session_create __session_create atomic_set(&sess->refcnt, 2) hash_add(sessions_table, &sess->hlist, sess->id) ksmbd_session_register xa_store(&conn->sessions, sess->id, sess) // fail ksmbd_user_session_put atomic_dec(&sess->refcnt) // refcnt is 1, session is not freed Remove the session from sessions_table and drop its table reference if xa_store() fails.
Title		smb/server: fix session leak in ksmbd_session_register()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/03a22a003f41b182245e6c71fe565e277cff7094 https://git.kernel.org/stable/c/55c677619084f9c9fa4146d933cc8ccafc924c87 https://git.kernel.org/stable/c/99b25b046e47e4904373cfeb445c5483f1633d88 https://git.kernel.org/stable/c/b967a595fb735d313a8676b2ca6a4cba38506482