efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- Partial Red Hat: 38 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.8.2 to before 3.9 | 3.9 | Patch available | CNA |
| Linux | Linux | 3.9 and later | 5.4.298, 5.10.242, 5.15.191, 6.1.150, 6.6.104, 6.12.45, 6.16.5, 6.17 | Patch available | CNA |
- Linux VendorLinux Affected 3.8.2 to before 3.9 Fixed in 3.9 Patch available CNA
- Linux VendorLinux Affected 3.9 and later Fixed in 5.4.298, 5.10.242, 5.15.191, 6.1.150, 6.6.104, 6.12.45, 6.16.5, 6.17 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.8.2 to before 5.4.298; 5.5 to before 5.10.242; 5.11 to before 5.15.191; 5.16 to before 6.1.150; 6.2 to before 6.6.104; 6.7 to before 6.12.45; 6.13 to before 6.16.5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* | 6.17 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* | 6.17 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* | 6.17 rc3 | Vulnerable | Linux |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.8.2 to before 5.4.298; 5.5 to before 5.10.242; 5.11 to before 5.15.191; 5.16 to before 6.1.150; 6.2 to before 6.6.104; 6.7 to before 6.12.45; 6.13 to before 6.16.5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:* Versions 6.17 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:* Versions 6.17 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:* Versions 6.17 rc3 Vulnerable ·Linux
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Linux (Linux) Fixed in 3.9
- Fix · CNA Linux (Linux) Fixed in 5.4.298, 5.10.242, 5.15.191, 6.1.150, 6.6.104, 6.12.45, 6.16.5, 6.17
Red Hat 17 advisories
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- Red Hat Enterprise Linux Server Optional (v. 7 ELS) kernel-debug-devel-3.10.0-1160.147.1.el7, kernel-tools-libs-devel-3.10.0-1160.147.1.el7
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- RHSA-2026:2490 Released 2026-02-11 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.179.1.el8_6, kernel-4.18.0-372.179.1.el8_6, kernel-abi-stablelists-4.18.0-372.179.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.179.1.el8_6, kernel-4.18.0-372.179.1.el8_6, kernel-abi-stablelists-4.18.0-372.179.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.179.1.el8_6, kernel-4.18.0-372.179.1.el8_6, kernel-abi-stablelists-4.18.0-372.179.1.el8_6 +14
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- Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bpftool-4.18.0-305.183.1.el8_4, kernel-4.18.0-305.183.1.el8_4, kernel-abi-stablelists-4.18.0-305.183.1.el8_4 +14
- RHSA-2025:23445 Released 2025-12-17 · Red Hat rating Importantkernel security update
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- RHSA-2025:22124 Released 2025-11-25 · Red Hat rating Moderatekernel-rt security update
- Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt-5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-core-5.14.0-284.148.1.rt14.433.el9_2, kernel-rt-debug-5.14.0-284.148.1.rt14.433.el9_2 +9
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- RHSA-2025:22095 Released 2025-11-25 · Red Hat rating Moderatekernel security update
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- RHSA-2025:18281 Released 2025-10-20 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-570.55.1.el9_6, kernel-64k-debug-devel-matched-5.14.0-570.55.1.el9_6, kernel-64k-devel-5.14.0-570.55.1.el9_6 +12
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Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.9.4) | Fixed | RHSA-2025:21760 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2025:18318, RHSA-2025:21118 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2025:18281, RHSA-2025:21112 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2025:22066 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2025:22095 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2025:21760 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2025:18318, RHSA-2025:21118 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2025:19102 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2025:18281, RHSA-2025:21112 |
| Red Hat Enterprise Linux BaseOS AUS (v. 8.2) | Fixed | RHSA-2025:23445 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2026:0533 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2026:2490 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2026:2490 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.8) | Fixed | RHSA-2025:22072 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2025:22066 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2025:22095 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.4) | Fixed | RHSA-2025:21760 |
| Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:0533 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2026:2490 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.8) | Fixed | RHSA-2025:22072 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2025:19102 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2025:18318, RHSA-2025:21118 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) | Fixed | RHSA-2025:18281, RHSA-2025:21112 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2025:19103 |
| Red Hat Enterprise Linux NFV E4S (v.9.0) | Fixed | RHSA-2025:22087 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2025:19103 |
| Red Hat Enterprise Linux Real Time (v. 10) | Fixed | RHSA-2025:18318, RHSA-2025:21118 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2025:18281, RHSA-2025:21112 |
| Red Hat Enterprise Linux Real Time E4S (v.9.0) | Fixed | RHSA-2025:22087 |
| Red Hat Enterprise Linux Real Time E4S (v.9.2) | Fixed | RHSA-2025:22124 |
| Red Hat Enterprise Linux Real Time EUS (v.9.4) | Fixed | RHSA-2025:21760 |
| Red Hat Enterprise Linux Real Time for NFV (v. 10) | Fixed | RHSA-2025:18318, RHSA-2025:21118 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2025:18281, RHSA-2025:21112 |
| Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) | Fixed | RHSA-2025:22124 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.4) | Fixed | RHSA-2025:21760 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:3685 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:3685 |
| Red Hat Enterprise Linux for Real Time (v. 7 ELS) | Fixed | RHSA-2026:3634 |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2025-39817
- 2026-10-03 Alias added: GHSA-m685-84xg-fvfj
References
Patch 8
- https://git.kernel.org/stable/c/0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6
- https://git.kernel.org/stable/c/794399019301944fd6d2e0d7a51b3327e26c410e
- https://git.kernel.org/stable/c/568e7761279b99c6daa3002290fd6d8047ddb6d2
- https://git.kernel.org/stable/c/d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7
- https://git.kernel.org/stable/c/925599eba46045930b850a98ae594d2e3028ac40
- https://git.kernel.org/stable/c/c2925cd6207079c3f4d040d082515db78d63afbf
- https://git.kernel.org/stable/c/71581a82f38e5a4d807d71fc1bb59aead80ccf95
- https://git.kernel.org/stable/c/a6358f8cf64850f3f27857b8ed8c1b08cfc4685c
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Sources
- CVE-2025-39817 · CVE Program
- CVE-2025-39817 · NVD
- FIRST EPSS
- GHSA-m685-84xg-fvfj · GitHub Advisory Database · CC BY 4.0
- CVE-2025-39817 · Red Hat security data · CC BY 4.0
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