CVE-2025-21853

MEDIUM EPSS 11.2%
Published Mar 12, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Mar 12, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: avoid holding freeze_mutex during mmap operation We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0]. So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment. [0] https://lore.kernel.org/bpf/678dcbc9.050a0220.303755.0066.GAE@google.com/

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
11.2% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.5  –  <6.6.80
linuxlinux_kernel*≥6.7  –  <6.12.17
linuxlinux_kernel*≥6.13  –  <6.13.5
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any
linuxlinux_kernel6.14any

References 9

  • git.kernel.org https://git.kernel.org/stable/c/0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f
  • git.kernel.org https://git.kernel.org/stable/c/271e49f8a58edba65bc2b1250a0abaa98c4bfdbe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/29cfda62ab4d92ab94123813db49ab76c1e61b29
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2ce31c97c219b4fe797749f950274f246eb88c49
  • git.kernel.org https://git.kernel.org/stable/c/4759acbd44d24a69b7b14848012ec4201d6c5501
  • git.kernel.org https://git.kernel.org/stable/c/bc27c52eea189e8f7492d40739b7746d67b65beb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/271e49f8a58edba65bc2b1250a0abaa98c4bfdbe
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/29cfda62ab4d92ab94123813db49ab76c1e61b29
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bc27c52eea189e8f7492d40739b7746d67b65beb
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4
    Patch