smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path (Linux Linux)

CVE-2026-31708
HIGH 8.1

En bref

Source
NVD
EPSS
EPSS 0.35 % · centile 29 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path smb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL and the default QUERY_INFO path. The QUERY_INFO branch clamps qi.input_buffer_length to the server-reported OutputBufferLength and then copies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but it never verifies that the flexible-array payload actually fits within rsp_iov[1].iov_len. A malicious server can return OutputBufferLength larger than the actual QUERY_INFO response, causing copy_to_user() to walk past the response buffer and expose adjacent kernel heap to userspace. Guard the QUERY_INFO copy with a bounds check on the actual Buffer payload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length) rather than an open-coded addition so the guard cannot overflow on 32-bit builds.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:HLinux
CVSS 3.1HIGH 8.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected f5778c398713692a16150ae96e5c8270bab8399f < e66bdc0704977ecee667a81d38255b579c2353d0 ; affected f5778c398713692a16150ae96e5c8270bab8399f < 9e203dbb5402897c43130fb171a2617008a91f45 ; affected f5778c398713692a16150ae96e5c8270bab8399f < 1dd757379997b71a328a4b591ffaf481acd0ead1 ; affected f5778c398713692a16150ae96e5c8270bab8399f < a34d456934fe42e4da5d2cc07787bf418bee99c6 ; affected f5778c398713692a16150ae96e5c8270bab8399f < ac2f14e4705d020f04e806efa0d49ab8dc2b145f ; affected f5778c398713692a16150ae96e5c8270bab8399f < 078fae8f50adebb903ccf2252b44391324571e78
Linux · Linuxaffected 5.1 ; unaffected 0 < 5.1 ; unaffected 5.10.259 ≤ 5.10.* ; unaffected 5.15.210 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.136 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD