High 7.8Published Sep 11, 2024

CVE-2024-45016netem: fix return value if duplicate enqueue fails

Updated under an hour ago (Oct 26, 2026, 7:40 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: netem: fix return value if duplicate enqueue fails There is a bug in netem_enqueue() introduced by commit 5845f706388a ("net: netem: fix skb length BUG_ON in __skb_to_sgvec") that can lead to a use-after-free. This commit made netem_enqueue() always return NET_XMIT_SUCCESS when a packet is duplicated, which can cause the parent qdisc's q.qlen to be mistakenly incremented. When this happens qlen_notify() 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 NET_XMIT_SUCCESS 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 NET_XMIT_SUCCESS.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	5845f706388a4cde0f6b80f9e5d33527e942b7d9 builds before 759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4; from 5845f706388a4cde0f6b80f9e5d33527e942b7d9 before c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d; 5845f706388a4cde0f6b80f9e5d33527e942b7d9 builds before 52d99a69f3d556c6426048c9d481b912205919d8; 5845f706388a4cde0f6b80f9e5d33527e942b7d9 builds before 0486d31dd8198e22b63a4730244b38fffce6d469; 5845f706388a4cde0f6b80f9e5d33527e942b7d9 builds before 577d6c0619467fe90f7e8e57e45cb5bd9d936014; from 5845f706388a4cde0f6b80f9e5d33527e942b7d9 before e5bb2988a310667abed66c7d3ffa28880cf0f883; from 5845f706388a4cde0f6b80f9e5d33527e942b7d9 before c07ff8592d57ed258afee5a5e04991a48dbaf382; a550a01b8af856f2684b0f79d552f5119eb5006c; and 9 more ranges	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1.1	CISA ADP
linux linux_kernel linux:linux_kernel	from 5.0 before 5.4.283; from 5.5 before 5.10.225; from 5.11 before 5.15.166; from 5.16 before 6.1.107; from 6.2 before 6.6.48; from 6.7 before 6.10.7; 6.11; 6.11; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4	patch
https://git.kernel.org/stable/c/c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d	patch
https://git.kernel.org/stable/c/52d99a69f3d556c6426048c9d481b912205919d8	patch
https://git.kernel.org/stable/c/0486d31dd8198e22b63a4730244b38fffce6d469	patch
https://git.kernel.org/stable/c/577d6c0619467fe90f7e8e57e45cb5bd9d936014	patch
https://git.kernel.org/stable/c/e5bb2988a310667abed66c7d3ffa28880cf0f883	patch
https://git.kernel.org/stable/c/c07ff8592d57ed258afee5a5e04991a48dbaf382	patch
https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
https://cert-portal.siemens.com/productcert/html/ssa-265688.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.