CVE-2025-39817
published 2025-09-16CVE-2025-39817: 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…
high7.1CVSS 3.1
AVLACLPRLUINSUCHINAH
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 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.
Affected
31 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.153-1 (bookworm) | linux 6.1.153-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 3.8.2 < 3.9 | 3.9 |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6 | 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6 |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < 794399019301944fd6d2e0d7a51b3327e26c410e | 794399019301944fd6d2e0d7a51b3327e26c410e |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < 568e7761279b99c6daa3002290fd6d8047ddb6d2 | 568e7761279b99c6daa3002290fd6d8047ddb6d2 |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7 | d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7 |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < 925599eba46045930b850a98ae594d2e3028ac40 | 925599eba46045930b850a98ae594d2e3028ac40 |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < c2925cd6207079c3f4d040d082515db78d63afbf | c2925cd6207079c3f4d040d082515db78d63afbf |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < 71581a82f38e5a4d807d71fc1bb59aead80ccf95 | 71581a82f38e5a4d807d71fc1bb59aead80ccf95 |
| linux | linux | >= da27a24383b2b10bf6ebd0db29b325548aafecb4 < a6358f8cf64850f3f27857b8ed8c1b08cfc4685c | a6358f8cf64850f3f27857b8ed8c1b08cfc4685c |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.244-1 | 5.10.244-1 |
| linux | linux_kernel | >= 0 < 6.1.153-1 | 6.1.153-1 |
| linux | linux_kernel | >= 0 < 6.12.48-1 | 6.12.48-1 |
| linux | linux_kernel | >= 0 < 6.16.5-1 | 6.16.5-1 |
| linux | linux_kernel | >= 0 < 5.15.0-163.173 | 5.15.0-163.173 |
| linux | linux_kernel | >= 0 < 6.8.0-106.106 | 6.8.0-106.106 |
| linux | linux_kernel | >= 3.8.2 < 5.4.298 | 5.4.298 |
| linux | linux_kernel | >= 5.11 < 5.15.191 | 5.15.191 |
| linux | linux_kernel | >= 5.16 < 6.1.150 | 6.1.150 |
| linux | linux_kernel | >= 5.5 < 5.10.242 | 5.10.242 |
CVSS provenance
nvdv3.17.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
osv7.1HIGH