CVE-2025-39817
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2025
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6 | Unavailable | None listed |
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | 794399019301944fd6d2e0d7a51b3327e26c410e | Unavailable | None listed |
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | 568e7761279b99c6daa3002290fd6d8047ddb6d2 | Unavailable | None listed |
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7 | Unavailable | None listed |
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | 925599eba46045930b850a98ae594d2e3028ac40 | Unavailable | None listed |
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | c2925cd6207079c3f4d040d082515db78d63afbf | Unavailable | None listed |
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | 71581a82f38e5a4d807d71fc1bb59aead80ccf95 | Unavailable | None listed |
| da27a24383b2b10bf6ebd0db29b325548aafecb4 | affected | git | a6358f8cf64850f3f27857b8ed8c1b08cfc4685c | Unavailable | None listed |
| 688289c4b745c018b3449b4b4c5a2030083c8eaf | affected | git | Unavailable | Unavailable | None listed |
| 3.8.2 | affected | semver | 3.9 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3.9 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.9 | Unavailable | None listed |
| 5.4.298 | unaffected | semver | Unavailable | 5.4.* | None listed |
| 5.10.242 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.191 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.150 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.104 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.45 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.16.5 | unaffected | semver | Unavailable | 6.16.* | None listed |
| 6.17 | unaffected | original_commit_for_fix | Unavailable | * | None listed |