ksmbd: safely drain sessions during logoff
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: safely drain sessions during logoff SMB3 multichannel allows requests for one session to run on multiple connections. Wait for all channels bound to a session before freeing shared session objects. A deferred byte-range lock remains counted as a running request and only wakes when its file closes. Wake blocked locks during the drain without unpublishing or modifying their file objects. Synchronous CANCEL requests must invoke their cancellation callback to wake pending operations, while CHANGE_NOTIFY completion remains specific to the asynchronous path. Serialize session teardown with channel registration and previous-session cleanup, and use atomic work-state transitions so LOGOFF, CANCEL, and connection teardown invoke cancellation callbacks only once.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 6.6.48 to before 6.7; 6.10.7 to before 6.11 | 6.7, 6.11 | Patch available | CNA |
| Linux | Linux | 6.11 and later | 7.2.7, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 6.6.48 to before 6.7; 6.10.7 to before 6.11 Fixed in 6.7, 6.11 Patch available CNA
- Linux VendorLinux Affected 6.11 and later Fixed in 7.2.7, 7.3 Patch available CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.6.48 to before 6.7; 6.10.7 to before 6.11; 6.11.1 to before 7.2.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:-:*:*:*:*:*:* | 6.11 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:* | 6.11 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:* | 6.11 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:* | 6.11 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:* | 7.3 rc1 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 6.6.48 to before 6.7; 6.10.7 to before 6.11; 6.11.1 to before 7.2.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:-:*:*:*:*:*:* Versions 6.11 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:* Versions 6.11 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:* Versions 6.11 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.11:rc7:*:*:*:*:*:* Versions 6.11 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:* Versions 7.3 rc1 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 6.7, 6.11
- Fix · CNA Linux (Linux) Fixed in 7.2.7, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
Not affected: 7 products
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-98115
- 2026-10-03 Alias added: GHSA-pwwp-xv6g-3r4c
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
More Linux Kernel vulnerabilities
- TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
- TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
- TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
- TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
- TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2026-98115 · CVE Program
- CVE-2026-98115 · NVD
- FIRST EPSS
- GHSA-pwwp-xv6g-3r4c · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98115 · Red Hat security data · CC BY 4.0
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