CVE-2022-48809

MEDIUM EPSS 19.9%
Published Jul 16, 20241y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jul 16, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.

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
19.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-401

Affected Products 7

VendorProductVersionRange
linuxlinux_kernel*≥4.3  –  <4.9.302
linuxlinux_kernel*≥4.10  –  <4.14.267
linuxlinux_kernel*≥4.15  –  <4.19.230
linuxlinux_kernel*≥4.20  –  <5.4.180
linuxlinux_kernel*≥5.5  –  <5.10.101
linuxlinux_kernel*≥5.11  –  <5.15.24
linuxlinux_kernel*≥5.16  –  <5.16.10

References 8

  • git.kernel.org https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314
    Patch