{"cve":"CVE-2026-64141","nvd":{"published":"2026-07-19T16:17:55.983","modified":"2026-08-18T12:39:25.733","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix null pointer dereference in compare_guid_key()\n\nsession_fd_check() walks the per-inode m_op_list during durable-handle\nsession teardown and sets op->conn = NULL for every opinfo whose conn\nmatched the closing session's connection. The matching opinfo, however,\nstays linked in its per-ClientGuid lease_table_list entry's lb->lease_list\nbecause destroy_lease_table() only runs on full TCP-connection teardown,\nnot on SESSION_LOGOFF.\n\nIf the same TCP connection then negotiates a fresh session with the\nsame ClientGuid (ClientGuid is bound to NEGOTIATE, not the session, and\nis unchanged across LOGOFF + SETUP) and issues a SMB2 CREATE with a\nlease context on a different inode, find_same_lease_key() walks\nlb->lease_list, reaches the stale opinfo, and calls compare_guid_key(),\nwhich unconditionally dereferences opinfo->conn->ClientGUID. The conn\npointer is NULL and the kernel panics.\n\nReproducer requires only a successful SMB2 SESSION_SETUP and a share\nconfigured with 'durable handles = yes'. KASAN report on mainline\n70390501d194:\n\n  general protection fault, probably for non-canonical address\n  0xdffffc0000000069: 0000 [#1] SMP KASAN PTI\n  KASAN: null-ptr-deref in range [0x0000000000000348-0x000000000000034f]\n  Workqueue: ksmbd-io handle_ksmbd_work\n  RIP: 0010:bcmp+0x5b/0x230\n  Call Trace:\n   compare_guid_key+0x4b/0xd0\n   find_same_lease_key+0x324/0x690\n   smb2_open+0x6aea/0x8e60\n   handle_ksmbd_work+0x796/0xee0\n   ...\n\nFaulting address 0x348 is the offset of ClientGUID within struct\nksmbd_conn, confirming opinfo->conn was NULL.\n\nRead opinfo->conn once and bail out if it has been cleared by a\nconcurrent session_fd_check(). A half-detached opinfo cannot be the\nowner of an active lease, so returning 0 is the correct match result.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-476"],"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"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-64141","score":0.0063,"percentile":0.50198,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}