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CVE-2026-72382— ksmbd: reject undersized DACLs before parsing ACEs

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 5.15版本存在安全漏洞，该漏洞源于DACL大小计算存在整数下溢，导致攻击者可通过发送恶意安全描述符绕过ACE计数检查，进行大量临时ACL状态和指针数组分配。

CVSS 8.8 · High EPSS 0.63% · P49

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 16fb65ec15fe7c90f50a2115854bfd9a032d4023 affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 282847c0cf22f2e961155ac8e42f6eeab7e16049 affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< d020e7f27bf65eecd3805404702f716b2b6d9e73 affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 15a9e9b8f7f5d7f380ae54c6f5bcbc0bdcb0f3cd affected
e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9< 60908f7ebcd9b6cde74ad5711fab0f49c7970949 affected
5.15 affected
< 5.15 unaffected
6.6.145≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-72382

Vulnerability Information
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Vulnerability Title
ksmbd: reject undersized DACLs before parsing ACEs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: reject undersized DACLs before parsing ACEs parse_dacl() limits the attacker-controlled ACE count by comparing it with the number of minimal ACEs that fit in the DACL size. The DACL size field is 16 bits, but the expression subtracts sizeof(struct smb_acl). Because sizeof() is unsigned, a DACL size smaller than the ACL header underflows to a large size_t. A malicious client can reach this with: SMB2_SET_INFO (InfoType=SMB2_O_INFO_SECURITY) -> smb2_set_info_sec() -> set_info_sec() -> parse_sec_desc() -> parse_dacl() -> init_acl_state(..., 0xffff) -> init_acl_state(..., 0xffff) -> kmalloc_objs(..., 0xffff) Thus a malformed security descriptor can make num_aces pass the guard and drive large temporary ACL state and pointer-array allocations. Reject DACLs smaller than struct smb_acl before doing the subtraction, so the ACE count check cannot be bypassed by the underflow.
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 5.15版本存在安全漏洞，该漏洞源于DACL大小计算存在整数下溢，导致攻击者可通过发送恶意安全描述符绕过ACE计数检查，进行大量临时ACL状态和指针数组分配。
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 ~ 16fb65ec15fe7c90f50a2115854bfd9a032d4023 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-72382

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III. Intelligence Information for CVE-2026-72382

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Patches & Fixes for CVE-2026-72382 (5)

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

CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
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-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-74361 9.8 CRITICAL nvme: fix FDP fdpcidx bounds check
CVE-2026-72491 9.8 CRITICAL net/9p: fix race condition on rdma->state in trans_rdma.c
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group
CVE-2026-72494 9.8 CRITICAL RDMA/irdma: Replace waitqueue and flag with completion
CVE-2026-72185 9.8 CRITICAL ntfs: fix WARN_ON for resident attribute in ntfs_map_runlist_nolock()
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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