CVE-2024-40913

HIGH EPSS 20.4%
Published Jul 12, 20241y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Jul 12, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: defer exposing anon_fd until after copy_to_user() succeeds After installing the anonymous fd, we can now see it in userland and close it. However, at this point we may not have gotten the reference count of the cache, but we will put it during colse fd, so this may cause a cache UAF. So grab the cache reference count before fd_install(). In addition, by kernel convention, fd is taken over by the user land after fd_install(), and the kernel should not call close_fd() after that, i.e., it should call fd_install() after everything is ready, thus fd_install() is called after copy_to_user() succeeds.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
20.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 6

VendorProductVersionRange
linuxlinux_kernel*≥5.19  –  <6.1.95
linuxlinux_kernel*≥6.2  –  <6.6.35
linuxlinux_kernel*≥6.7  –  <6.9.6
linuxlinux_kernel6.10any
linuxlinux_kernel6.10any
linuxlinux_kernel6.10any

References 5

  • git.kernel.org https://git.kernel.org/stable/c/4b4391e77a6bf24cba2ef1590e113d9b73b11039
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9f58cdae6a364a3270fd6b6a46e0fd4f7f8ce32
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d2d3eb377a5d081bf2bed177d354a4f59b74da88
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eac51d9daacd61dcc93333ff6a890cf3efc8c1c0
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/4b4391e77a6bf24cba2ef1590e113d9b73b11039
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b9f58cdae6a364a3270fd6b6a46e0fd4f7f8ce32
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d2d3eb377a5d081bf2bed177d354a4f59b74da88
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eac51d9daacd61dcc93333ff6a890cf3efc8c1c0
    Patch