CVE-2022-48809

MEDIUM
Published Jul 16, 2024 Modified Nov 21, 2024 CWE-401

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-401 CWE-401

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2022-48809? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2022-48809? +
CVE-2022-48809 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2022-48809? +
CVE-2022-48809 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2022-48809? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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