Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected fc4099f17240767554ff3a73977acb78ef615404 before 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4; affected fc4099f17240767554ff3a73977acb78ef615404 before c1ff27d100e2670b03cbfddb9117e5f9fc672540; affected fc4099f17240767554ff3a73977acb78ef615404 before 0be943916d781df2b652793bb2d3ae4f9624c10a; affected fc4099f17240767554ff3a73977acb78ef615404 before a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88; affected fc4099f17240767554ff3a73977acb78ef615404 before 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1; affected fc4099f17240767554ff3a73977acb78ef615404 before fdcb263fa5cda15b8cb24a641fa2718c47605314; affected fc4099f17240767554ff3a73977acb78ef615404 before 8b1087b998e273f07be13dcb5f3ca4c309c7f108; affected fc4099f17240767554ff3a73977acb78ef615404 before 9eeabdf17fa0ab75381045c867c370f4cc75a613 |
| Linux / Linux | affected 4.3; unaffected 0 before 4.3; unaffected 4.9.302 through 4.9.*; unaffected 4.14.267 through 4.14.*; unaffected 4.19.230 through 4.19.*; unaffected 5.4.180 through 5.4.*; unaffected 5.10.101 through 5.10.*; unaffected 5.15.24 through 5.15.*; unaffected 5.16.10 through 5.16.*; unaffected 5.17 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
- https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540
- https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a
- https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
- https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
- https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314
- https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108
- https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613
ADP enrichment
No English description supplied.
- https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
- https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540
- https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a
- https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
- https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
- https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314
- https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108
- https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613
No English description supplied.
No references supplied.