01 Record

CVE-2026-63909

ksmbd: OOB read regression in smb_check_perm_dacl() ACE-walk loops

HighPUBLISHEDCNA: Linux

CNA base score8.1 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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02 Description

ksmbd: OOB read regression in smb_check_perm_dacl() ACE-walk loops

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.62% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 49.9% of scored records. A rank, not a probability.
NVD base score: 8.1 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD analysis status: Awaiting Analysis. NVD last modified this record on 2026-07-27.
Red Hat severity: Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-07-19 14:55Z3 MO AGO

Last updated

2026-08-05 12:37Z2 MO AGO

Reserved

2026-07-19

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.1)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weaknesses

CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

92402cedf1647cbc6e8cf9cb48aa0b5ca0c7e0fea91609a5ad391be22d4306b1

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux282cbbb476b9f35793452bc461934af4c7eca169 to < 5500ba1d410aed1eded3eb04a76b10cfb4409334, f20adc4ef7428bc485ee83fd1a592252fb87718b to < f6324b4240cf0b26a84c33f68a1222d727ff4af2, 325d4ac11f526cb8964cff14548ccf02d8c756d8 to < 0fe08c5776a798f46df1fd74b331be26bdd644d6, 95e5aa3c3261da8c95b27d7aecf8ee39b9f86a4c to < d333af32e4451285e427f2d9c29de3a39f6f6d48, 90089584b2e25c4510b7b987387b4405f0673ece to < 94215d55b09445993929f4fc966061d61de74929, 151b1799861fde38087c08f613abc2843ef597b0 to < 4f7c131d2bdd7cd64b96f60d10be5ea72253f520, d07b26f39246a82399661936dd0c853983cfade7 to < 0e60dafe97eca61721f3db456f97d97a80c6c8ae, 6.6.140 to < 6.6.143, 6.12.84 to < 6.12.93, 6.18.25 to < 6.18.35, 7.0.2 to < 7.0.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/5500ba1d410aed1eded3eb04a76b10cfb4409334
git.kernel.orghttps://git.kernel.org/stable/c/f6324b4240cf0b26a84c33f68a1222d727ff4af2
git.kernel.orghttps://git.kernel.org/stable/c/0fe08c5776a798f46df1fd74b331be26bdd644d6
git.kernel.orghttps://git.kernel.org/stable/c/d333af32e4451285e427f2d9c29de3a39f6f6d48
git.kernel.orghttps://git.kernel.org/stable/c/94215d55b09445993929f4fc966061d61de74929
git.kernel.orghttps://git.kernel.org/stable/c/4f7c131d2bdd7cd64b96f60d10be5ea72253f520
git.kernel.orghttps://git.kernel.org/stable/c/0e60dafe97eca61721f3db456f97d97a80c6c8ae

07 Fixed in

Debian 13

linux
Fixed in 6.12.94-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 7.0.12-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.