CVE-2023-52924

MEDIUM EPSS 9.0%
Published Feb 5, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 5, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: don't skip expired elements during walk There is an asymmetry between commit/abort and preparation phase if the following conditions are met: 1. set is a verdict map ("1.2.3.4 : jump foo") 2. timeouts are enabled In this case, following sequence is problematic: 1. element E in set S refers to chain C 2. userspace requests removal of set S 3. kernel does a set walk to decrement chain->use count for all elements from preparation phase 4. kernel does another set walk to remove elements from the commit phase (or another walk to do a chain->use increment for all elements from abort phase) If E has already expired in 1), it will be ignored during list walk, so its use count won't have been changed. Then, when set is culled, ->destroy callback will zap the element via nf_tables_set_elem_destroy(), but this function is only safe for elements that have been deactivated earlier from the preparation phase: lack of earlier deactivate removes the element but leaks the chain use count, which results in a WARN splat when the chain gets removed later, plus a leak of the nft_chain structure. Update pipapo_get() not to skip expired elements, otherwise flush command reports bogus ENOENT errors.

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
9.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥4.1  –  <4.19.316
linuxlinux_kernel*≥4.20  –  <5.4.262
linuxlinux_kernel*≥5.5  –  <5.10.198
linuxlinux_kernel*≥5.11  –  <5.15.134
linuxlinux_kernel*≥5.16  –  <6.1.56
linuxlinux_kernel*≥6.2  –  <6.4.11
linuxlinux_kernel6.5any
linuxlinux_kernel6.5any
linuxlinux_kernel6.5any
linuxlinux_kernel6.5any
linuxlinux_kernel6.5any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/1da4874d05da1526b11b82fc7f3c7ac38749ddf8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/24138933b97b055d486e8064b4a1721702442a9b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/59dab3bf0b8fc08eb802721c0532f13dd89209b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7c7e658a36f8b1522bd3586d8137e5f93a25ddc5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/94313a196b44184b5b52c1876da6a537701b425a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b15ea4017af82011dd55225ce77cce3d4dfc169c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bd156ce9553dcaf2d6ee2c825d1a5a1718e86524
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1da4874d05da1526b11b82fc7f3c7ac38749ddf8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/24138933b97b055d486e8064b4a1721702442a9b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/59dab3bf0b8fc08eb802721c0532f13dd89209b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7c7e658a36f8b1522bd3586d8137e5f93a25ddc5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/94313a196b44184b5b52c1876da6a537701b425a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b15ea4017af82011dd55225ce77cce3d4dfc169c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bd156ce9553dcaf2d6ee2c825d1a5a1718e86524
    Patch