Ubuntu: (CVE-2022-48809): linux vulnerability

Ubuntu: (CVE-2022-48809): linux vulnerability

Severity

5

CVSS

(AV:L/AC:L/Au:S/C:N/I:N/A:C)

Published

07/16/2024

Created

11/21/2024

Added

11/19/2024

Modified

02/11/2025

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.

Solution(s)

• ubuntu-upgrade-linux
• ubuntu-upgrade-linux-aws
• ubuntu-upgrade-linux-aws-5-4
• ubuntu-upgrade-linux-aws-fips
• ubuntu-upgrade-linux-aws-hwe
• ubuntu-upgrade-linux-azure
• ubuntu-upgrade-linux-azure-4-15
• ubuntu-upgrade-linux-azure-5-4
• ubuntu-upgrade-linux-azure-fips
• ubuntu-upgrade-linux-bluefield
• ubuntu-upgrade-linux-fips
• ubuntu-upgrade-linux-gcp
• ubuntu-upgrade-linux-gcp-4-15
• ubuntu-upgrade-linux-gcp-5-4
• ubuntu-upgrade-linux-gcp-fips
• ubuntu-upgrade-linux-gkeop
• ubuntu-upgrade-linux-hwe
• ubuntu-upgrade-linux-hwe-5-4
• ubuntu-upgrade-linux-ibm
• ubuntu-upgrade-linux-ibm-5-4
• ubuntu-upgrade-linux-intel-iotg-5-15
• ubuntu-upgrade-linux-iot
• ubuntu-upgrade-linux-kvm
• ubuntu-upgrade-linux-oracle
• ubuntu-upgrade-linux-oracle-5-4
• ubuntu-upgrade-linux-raspi
• ubuntu-upgrade-linux-raspi-5-4

References

• https://attackerkb.com/topics/cve-2022-48809
• CVE - 2022-48809
• https://git.kernel.org/linus/9eeabdf17fa0ab75381045c867c370f4cc75a613
• 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://www.cve.org/CVERecord?id=CVE-2022-48809

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