CVE-2022-48809

net: fix a memleak when uncloning an skb dst and its metadata

State: Published
Severity: Not scored
Published: Jul 16, 2024
Updated: May 11, 2026
Reserved: Jul 16, 2024

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	fc4099f17240767554ff3a73977acb78ef615404 to before 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4Affected fc4099f17240767554ff3a73977acb78ef615404 to before c1ff27d100e2670b03cbfddb9117e5f9fc672540Affected fc4099f17240767554ff3a73977acb78ef615404 to before 0be943916d781df2b652793bb2d3ae4f9624c10aAffected fc4099f17240767554ff3a73977acb78ef615404 to before a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88Affected fc4099f17240767554ff3a73977acb78ef615404 to before 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1Affected fc4099f17240767554ff3a73977acb78ef615404 to before fdcb263fa5cda15b8cb24a641fa2718c47605314Affected fc4099f17240767554ff3a73977acb78ef615404 to before 8b1087b998e273f07be13dcb5f3ca4c309c7f108Affected fc4099f17240767554ff3a73977acb78ef615404 to before 9eeabdf17fa0ab75381045c867c370f4cc75a613Affected
LinuxLinux	4.3Affected before 4.3Not affected 4.9.302 through 4.9.Not affected 4.14.267 through 4.14.Not affected 4.19.230 through 4.19.Not affected 5.4.180 through 5.4.Not affected 5.10.101 through 5.10.Not affected 5.15.24 through 5.15.Not affected 5.16.10 through 5.16.*Not affected 5.17 and laterNot affected

Product

Versions

LinuxLinux

fc4099f17240767554ff3a73977acb78ef615404 to before 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4Affected
fc4099f17240767554ff3a73977acb78ef615404 to before c1ff27d100e2670b03cbfddb9117e5f9fc672540Affected
fc4099f17240767554ff3a73977acb78ef615404 to before 0be943916d781df2b652793bb2d3ae4f9624c10aAffected
fc4099f17240767554ff3a73977acb78ef615404 to before a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88Affected
fc4099f17240767554ff3a73977acb78ef615404 to before 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1Affected
fc4099f17240767554ff3a73977acb78ef615404 to before fdcb263fa5cda15b8cb24a641fa2718c47605314Affected
fc4099f17240767554ff3a73977acb78ef615404 to before 8b1087b998e273f07be13dcb5f3ca4c309c7f108Affected
fc4099f17240767554ff3a73977acb78ef615404 to before 9eeabdf17fa0ab75381045c867c370f4cc75a613Affected

LinuxLinux

4.3Affected
before 4.3Not affected
4.9.302 through 4.9.*Not affected
4.14.267 through 4.14.*Not affected
4.19.230 through 4.19.*Not affected
5.4.180 through 5.4.*Not affected
5.10.101 through 5.10.*Not affected
5.15.24 through 5.15.*Not affected
5.16.10 through 5.16.*Not affected
5.17 and laterNot affected

References

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