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CVE-2026-72492— ksmbd: fix use-after-free in same_client_has_lease()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于same_client_has_lease()函数在释放锁后未获取引用即返回指针，可能导致释放后重用。

CVSS 8.8 · High EPSS 0.64% · P50

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0 affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 09634cd055d9bd8dd167995ea52bcd8028dd5dac affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 7c3264d273d524aa6adcce23c01087271f13586f affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 79c7c59bb519db6f5a2a151965e825ec725614cc affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 35d3d6ff2bc1e7aaecb15d5377ebbd6227acae0d affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 0ff82a9cf9312678d8bc4edeef0b6e82659ac12a affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 65b655f65c3ca1ab5d598d3832bb0ff531725858 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-72492

Vulnerability Information
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Vulnerability Title
ksmbd: fix use-after-free in same_client_has_lease()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in same_client_has_lease() same_client_has_lease() returns an opinfo pointer from ci->m_op_list after dropping ci->m_lock without taking a reference. smb_grant_oplock() then dereferences that pointer in copy_lease() and when checking breaking_cnt. A concurrent close can remove the old lease from ci->m_op_list and drop the last reference before the caller uses the returned pointer, leading to a use-after-free. Take a reference when same_client_has_lease() selects an existing lease, drop any previous match while scanning, and release the returned reference in smb_grant_oplock() after copying the lease state.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于same_client_has_lease()函数在释放锁后未获取引用即返回指针，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 ~ aaa3bb2bbf2ccbfea9e4e0b9dabf3afc60b50cd0 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-72492

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III. Intelligence Information for CVE-2026-72492

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Patches & Fixes for CVE-2026-72492 (7)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74493 9.8 CRITICAL net/smc: fix socket use-after-free during link group termination
CVE-2026-74315 9.8 CRITICAL lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()
CVE-2026-74401 9.8 CRITICAL dlm: fix add msg handle in send_queue ordered
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-74495 9.8 CRITICAL igbvf: Fix leak in TX DMA error cleanup
CVE-2026-74345 9.8 CRITICAL RDMA/siw: Fix endpoint/socket association handling
CVE-2026-72191 9.8 CRITICAL ntfs3: validate split-point offset in indx_insert_into_buffer
CVE-2026-72084 9.8 CRITICAL scsi: target: Bound PR-OUT TransportID parsing to the received buffer
CVE-2026-72083 9.8 CRITICAL scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
CVE-2026-74350 9.8 CRITICAL ocfs2: validate fast symlink target during inode read
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72492

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