CVE-2026-72382
CVE CVE-2026-72382EUVD EUVD-2026-59281Published 2026-08-15T05:56:14.000ZLast changed 2026-08-17T05:43:33.000ZCVSS 8.8
What the advisory describes
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: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 0; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <16fb65ec15fe7c90f50a2115854bfd9a032d4023; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <282847c0cf22f2e961155ac8e42f6eeab7e16049; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <60908f7ebcd9b6cde74ad5711fab0f49c7970949; patch: 6.18.40; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <d020e7f27bf65eecd3805404702f716b2b6d9e73; patch: 6.6.145; patch: 6.12.97; patch: 7.1.5; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 <15a9e9b8f7f5d7f380ae54c6f5bcbc0bdcb0f3cd; 5.15; patch: 7.2
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
Does this concern one of your customers?
This page cannot answer that — it does not know your estate. Whoever has recorded their environments gets the answer the morning after publication, together with a paragraph they can forward to the customer unedited.
Try it for 28 daysPatchlage reports hits and suspected hits. About everything else this system says nothing — neither this page nor the situation report ever claims that an estate is safe.