efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare (Linux Linux)

CVE-2025-39817
HIGH 7.1

En bref

Source
NVD
EPSS
EPSS 0.17 % · centile 6 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare Observed on kernel 6.6 (present on master as well): BUG: KASAN: slab-out-of-bounds in memcmp+0x98/0xd0 Call trace: kasan_check_range+0xe8/0x190 __asan_loadN+0x1c/0x28 memcmp+0x98/0xd0 efivarfs_d_compare+0x68/0xd8 __d_lookup_rcu_op_compare+0x178/0x218 __d_lookup_rcu+0x1f8/0x228 d_alloc_parallel+0x150/0x648 lookup_open.isra.0+0x5f0/0x8d0 open_last_lookups+0x264/0x828 path_openat+0x130/0x3f8 do_filp_open+0x114/0x248 do_sys_openat2+0x340/0x3c0 __arm64_sys_openat+0x120/0x1a0 If dentry->d_name.len < EFI_VARIABLE_GUID_LEN , 'guid' can become negative, leadings to oob. The issue can be triggered by parallel lookups using invalid filename: T1 T2 lookup_open ->lookup simple_lookup d_add // invalid dentry is added to hash list lookup_open d_alloc_parallel __d_lookup_rcu __d_lookup_rcu_op_compare hlist_bl_for_each_entry_rcu // invalid dentry can be retrieved ->d_compare efivarfs_d_compare // oob Fix it by checking 'guid' before cmp.

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HLinux
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)
CVSS 3.1HIGH 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected da27a24383b2b10bf6ebd0db29b325548aafecb4 < 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6 ; affected da27a24383b2b10bf6ebd0db29b325548aafecb4 < 794399019301944fd6d2e0d7a51b3327e26c410e ; affected da27a24383b2b10bf6ebd0db29b325548aafecb4 < 568e7761279b99c6daa3002290fd6d8047ddb6d2 ; affected da27a24383b2b10bf6ebd0db29b325548aafecb4 < d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7 ; affected da27a24383b2b10bf6ebd0db29b325548aafecb4 < 925599eba46045930b850a98ae594d2e3028ac40 ; affected da27a24383b2b10bf6ebd0db29b325548aafecb4 < c2925cd6207079c3f4d040d082515db78d63afbf
Linux · Linuxaffected 3.9 ; unaffected 0 < 3.9 ; unaffected 5.4.298 ≤ 5.4.* ; unaffected 5.10.242 ≤ 5.10.* ; unaffected 5.15.191 ≤ 5.15.* ; unaffected 6.1.150 ≤ 6.1.*

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