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CVE-2025-39817— efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于efivarfs_d_compare函数中未正确验证dentry长度，可能导致内存越界读取。

CVSS 7.1 · High EPSS 0.17% · P6

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux da27a24383b2b10bf6ebd0db29b325548aafecb4< 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6 affected
da27a24383b2b10bf6ebd0db29b325548aafecb4< 794399019301944fd6d2e0d7a51b3327e26c410e affected
da27a24383b2b10bf6ebd0db29b325548aafecb4< 568e7761279b99c6daa3002290fd6d8047ddb6d2 affected
da27a24383b2b10bf6ebd0db29b325548aafecb4< d7f5e35e70507d10cbaff5f9e194ed54c4ee14f7 affected
da27a24383b2b10bf6ebd0db29b325548aafecb4< 925599eba46045930b850a98ae594d2e3028ac40 affected
da27a24383b2b10bf6ebd0db29b325548aafecb4< c2925cd6207079c3f4d040d082515db78d63afbf affected
da27a24383b2b10bf6ebd0db29b325548aafecb4< 71581a82f38e5a4d807d71fc1bb59aead80ccf95 affected
da27a24383b2b10bf6ebd0db29b325548aafecb4< a6358f8cf64850f3f27857b8ed8c1b08cfc4685c affected
… +12 more rows
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I. Basic Information for CVE-2025-39817

Vulnerability Information
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Vulnerability Title
efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于efivarfs_d_compare函数中未正确验证dentry长度，可能导致内存越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux da27a24383b2b10bf6ebd0db29b325548aafecb4 ~ 0f63fbabeaaaaaaf5b742a2f4c1b4590d50bf1f6 -
Linux Linux 3.9 -

II. Public POCs for CVE-2025-39817

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III. Intelligence Information for CVE-2025-39817

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Same Patch Batch · Linux · 2025-09-16 · 115 CVEs total

CVE-2022-50350 9.8 CRITICAL scsi: target: iscsi: Fix a race condition between login_work and the login thread
CVE-2025-39806 8.8 HIGH HID: multitouch: fix slab out-of-bounds access in mt_report_fixup()
CVE-2023-53305 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free
CVE-2023-53297 8.8 HIGH Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp
CVE-2025-39827 8.8 HIGH net: rose: include node references in rose_neigh refcount
CVE-2025-39826 8.8 HIGH net: rose: convert 'use' field to refcount_t
CVE-2023-53315 8.8 HIGH wifi: ath11k: Fix SKB corruption in REO destination ring
CVE-2023-53322 8.8 HIGH scsi: qla2xxx: Wait for io return on terminate rport
CVE-2025-39809 8.4 HIGH HID: intel-thc-hid: intel-quicki2c: Fix ACPI dsd ICRS/ISUB length
CVE-2023-53333 8.2 HIGH netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one
CVE-2022-50341 7.8 HIGH cifs: fix oops during encryption
CVE-2025-39810 7.8 HIGH bnxt_en: Fix memory corruption when FW resources change during ifdown
CVE-2023-53311 7.8 HIGH nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput
CVE-2023-53314 7.8 HIGH fbdev/ep93xx-fb: Do not assign to struct fb_info.dev
CVE-2023-53286 7.8 HIGH RDMA/mlx5: Return the firmware result upon destroying QP/RQ
CVE-2025-39815 7.8 HIGH RISC-V: KVM: fix stack overrun when loading vlenb
CVE-2025-39818 7.8 HIGH HID: intel-thc-hid: intel-thc: Fix incorrect pointer arithmetic in I2C regs save
CVE-2023-53331 7.8 HIGH pstore/ram: Check start of empty przs during init
CVE-2025-39836 7.8 HIGH efi: stmm: Fix incorrect buffer allocation method
CVE-2023-53274 7.8 HIGH clk: mediatek: mt8183: Add back SSPM related clocks

Showing top 20 of 115 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39817

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