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
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.
- 🔗 git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40…
- 🔗 git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9…
- 🔗 git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f…
- 🔗 git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4…
- 🔗 git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2…
- 🔗 git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c…
- 🔗 git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c3…
- 🔗 git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4…
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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
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 th