CVE-2024-45016

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Source
https://cve.org/CVERecord?id=CVE-2024-45016
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-45016.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-45016
Downstream
Related
Published
2024-09-11T15:13:52.053Z
Modified
2026-03-20T12:38:57.610236Z
Summary
netem: fix return value if duplicate enqueue fails
Details

In the Linux kernel, the following vulnerability has been resolved:

netem: fix return value if duplicate enqueue fails

There is a bug in netemenqueue() introduced by commit 5845f706388a ("net: netem: fix skb length BUGON in __skbtosgvec") that can lead to a use-after-free.

This commit made netemenqueue() always return NETXMITSUCCESS when a packet is duplicated, which can cause the parent qdisc's q.qlen to be mistakenly incremented. When this happens qlennotify() may be skipped on the parent during destruction, leaving a dangling pointer for some classful qdiscs like DRR.

There are two ways for the bug happen:

  • If the duplicated packet is dropped by rootq->enqueue() and then the original packet is also dropped.
  • If rootq->enqueue() sends the duplicated packet to a different qdisc and the original packet is dropped.

In both cases NETXMITSUCCESS is returned even though no packets are enqueued at the netem qdisc.

The fix is to defer the enqueue of the duplicate packet until after the original packet has been guaranteed to return NETXMITSUCCESS.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/45xxx/CVE-2024-45016.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
5845f706388a4cde0f6b80f9e5d33527e942b7d9
Fixed
759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4
Fixed
c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d
Fixed
52d99a69f3d556c6426048c9d481b912205919d8
Fixed
0486d31dd8198e22b63a4730244b38fffce6d469
Fixed
577d6c0619467fe90f7e8e57e45cb5bd9d936014
Fixed
e5bb2988a310667abed66c7d3ffa28880cf0f883
Fixed
c07ff8592d57ed258afee5a5e04991a48dbaf382
Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
a550a01b8af856f2684b0f79d552f5119eb5006c
Last affected
009510a90e230bb495f3fe25c7db956679263b07
Last affected
4de7d30668cb8b06330992e1cd336f91700a2ce7
Last affected
d1dd2e15c85e890a1cc9bde5ba07ae63331e5c73
Last affected
0148fe458b5705e2fea7cb88294fed7e36066ca2

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-45016.json"