CVE-2026-64141
- Source
- https://cve.org/CVERecord?id=CVE-2026-64141
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64141.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-64141
- Downstream
- Published
- 2026-07-19T15:40:33.890Z
- Modified
- 2026-08-12T03:51:28.094310105Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- ksmbd: fix null pointer dereference in compare_guid_key()
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix null pointer dereference in compareguidkey()
sessionfdcheck() walks the per-inode moplist during durable-handle session teardown and sets op->conn = NULL for every opinfo whose conn matched the closing session's connection. The matching opinfo, however, stays linked in its per-ClientGuid leasetablelist entry's lb->leaselist because destroyleasetable() only runs on full TCP-connection teardown, not on SESSIONLOGOFF.
If the same TCP connection then negotiates a fresh session with the same ClientGuid (ClientGuid is bound to NEGOTIATE, not the session, and is unchanged across LOGOFF + SETUP) and issues a SMB2 CREATE with a lease context on a different inode, findsameleasekey() walks lb->leaselist, reaches the stale opinfo, and calls compareguidkey(), which unconditionally dereferences opinfo->conn->ClientGUID. The conn pointer is NULL and the kernel panics.
Reproducer requires only a successful SMB2 SESSION_SETUP and a share configured with 'durable handles = yes'. KASAN report on mainline 70390501d194:
general protection fault, probably for non-canonical address 0xdffffc0000000069: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000348-0x000000000000034f] Workqueue: ksmbd-io handleksmbdwork RIP: 0010:bcmp+0x5b/0x230 Call Trace: compareguidkey+0x4b/0xd0 findsameleasekey+0x324/0x690 smb2open+0x6aea/0x8e60 handleksmbdwork+0x796/0xee0 ...
Faulting address 0x348 is the offset of ClientGUID within struct ksmbd_conn, confirming opinfo->conn was NULL.
Read opinfo->conn once and bail out if it has been cleared by a concurrent sessionfdcheck(). A half-detached opinfo cannot be the owner of an active lease, so returning 0 is the correct match result.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64141.json" }- References
-
- https://git.kernel.org/stable/c/0836081b394ca074d1b910f2b990ff7b4b4404c7
- https://git.kernel.org/stable/c/4b83cbc4c15f09b000cc06f033f64b0824b6dc87
- https://git.kernel.org/stable/c/af86896ca3239e25a6bd7d352213371265073d38
- https://git.kernel.org/stable/c/cd5c1b75d2f454f625d7dc55bd3ae21d0855f6ad
- https://git.kernel.org/stable/c/e43cb36d4d7827710cfcd48e95e29a507f0d87be
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64141.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-64141
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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
-
Introduced8df4bcdb0a4232192b2445256c39b787d58ef14dFixede43cb36d4d7827710cfcd48e95e29a507f0d87be
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedc8efcc786146a951091588e5fa7e3c754850cb3cFixed0836081b394ca074d1b910f2b990ff7b4b4404c7Fixedcd5c1b75d2f454f625d7dc55bd3ae21d0855f6adFixedaf86896ca3239e25a6bd7d352213371265073d38Fixed4b83cbc4c15f09b000cc06f033f64b0824b6dc87
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.6.32Fixed6.6.142
Affected versions
v6.*
Linux / Kernel
Package
- Name
- Kernel