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.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"include/net/dst_metadata.h"
],
"versions": [
{
"version": "fc4099f17240",
"lessThan": "4ac84498fbe8",
"status": "affected",
"versionType": "git"
},
{
"version": "fc4099f17240",
"lessThan": "c1ff27d100e2",
"status": "affected",
"versionType": "git"
},
{
"version": "fc4099f17240",
"lessThan": "0be943916d78",
"status": "affected",
"versionType": "git"
},
{
"version": "fc4099f17240",
"lessThan": "a80817adc2a4",
"status": "affected",
"versionType": "git"
},
{
"version": "fc4099f17240",
"lessThan": "00e6d6c3bc14",
"status": "affected",
"versionType": "git"
},
{
"version": "fc4099f17240",
"lessThan": "fdcb263fa5cd",
"status": "affected",
"versionType": "git"
},
{
"version": "fc4099f17240",
"lessThan": "8b1087b998e2",
"status": "affected",
"versionType": "git"
},
{
"version": "fc4099f17240",
"lessThan": "9eeabdf17fa0",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"include/net/dst_metadata.h"
],
"versions": [
{
"version": "4.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.3",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.9.302",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.267",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.230",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.180",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.101",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.24",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.16.10",
"lessThanOrEqual": "5.16.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a
git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108
git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613
git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540
git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314