In the Linux kernel, the following vulnerability has been resolved:
l2tp: pass correct message length to ip6_append_data
l2tp_ip6_sendmsg needs to avoid accounting for the transport header
twice when splicing more data into an already partially-occupied skbuff.
To manage this, we check whether the skbuff contains data using
skb_queue_empty when deciding how much data to append using
ip6_append_data.
However, the code which performed the calculation was incorrect:
ulen = len + skb_queue_empty(&sk->sk_write_queue) ? transhdrlen : 0;
…due to C operator precedence, this ends up setting ulen to
transhdrlen for messages with a non-zero length, which results in
corrupted packets on the wire.
Add parentheses to correct the calculation in line with the original
intent.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/l2tp/l2tp_ip6.c"
],
"versions": [
{
"version": "559d697c5d07",
"lessThan": "4c3ce64bc9d3",
"status": "affected",
"versionType": "git"
},
{
"version": "1fc793d68d50",
"lessThan": "c1d3a84a67db",
"status": "affected",
"versionType": "git"
},
{
"version": "96b2e1090397",
"lessThan": "dcb4d1426859",
"status": "affected",
"versionType": "git"
},
{
"version": "cd1189956393",
"lessThan": "0da15a703951",
"status": "affected",
"versionType": "git"
},
{
"version": "f6a7182179c0",
"lessThan": "13cd1daeea84",
"status": "affected",
"versionType": "git"
},
{
"version": "9d4c75800f61",
"lessThan": "804bd8650a3a",
"status": "affected",
"versionType": "git"
},
{
"version": "9d4c75800f61",
"lessThan": "83340c66b498",
"status": "affected",
"versionType": "git"
},
{
"version": "9d4c75800f61",
"lessThan": "359e54a93ab4",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/l2tp/l2tp_ip6.c"
],
"versions": [
{
"version": "6.6",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.6",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.308",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.270",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.211",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.150",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.80",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.19",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.7.7",
"lessThanOrEqual": "6.7.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.8",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/0da15a70395182ee8cb75716baf00dddc0bea38d
git.kernel.org/stable/c/13cd1daeea848614e585b2c6ecc11ca9c8ab2500
git.kernel.org/stable/c/359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79
git.kernel.org/stable/c/4c3ce64bc9d36ca9164dd6c77ff144c121011aae
git.kernel.org/stable/c/804bd8650a3a2bf3432375f8c97d5049d845ce56
git.kernel.org/stable/c/83340c66b498e49353530e41542500fc8a4782d6
git.kernel.org/stable/c/c1d3a84a67db910ce28a871273c992c3d7f9efb5
git.kernel.org/stable/c/dcb4d14268595065c85dc5528056713928e17243
lists.debian.org/debian-lts-announce/2024/06/msg00017.html
lists.debian.org/debian-lts-announce/2024/06/msg00020.html