5.5

CVE-2022-48809

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.3 < 4.9.302
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.267
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.230
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.180
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.101
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.24
Linux ≫ Linux Kernel Version >= 5.16 < 5.16.10
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.28% 0.197
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-401 Missing Release of Memory after Effective Lifetime

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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