CVE-2024-45016netem: fix return value if duplicate enqueue fails
- 7.8HighCVSS base score
- 0.28%Exploitation in 30 daysEPSS · top 79% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 21 days later
· 21 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.28% · top 79% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 5845f706388a4cde0f6b80f9e5d33527e942b7d9 – < 759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4
- affected 5845f706388a4cde0f6b80f9e5d33527e942b7d9 – < c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d
- affected 5845f706388a4cde0f6b80f9e5d33527e942b7d9 – < 52d99a69f3d556c6426048c9d481b912205919d8
- affected 5845f706388a4cde0f6b80f9e5d33527e942b7d9 – < 0486d31dd8198e22b63a4730244b38fffce6d469
- affected 5845f706388a4cde0f6b80f9e5d33527e942b7d9 – < 577d6c0619467fe90f7e8e57e45cb5bd9d936014
- affected 5845f706388a4cde0f6b80f9e5d33527e942b7d9 – < e5bb2988a310667abed66c7d3ffa28880cf0f883
- affected 5845f706388a4cde0f6b80f9e5d33527e942b7d9 – < c07ff8592d57ed258afee5a5e04991a48dbaf382
- affected a550a01b8af856f2684b0f79d552f5119eb5006c
- affected 009510a90e230bb495f3fe25c7db956679263b07
- affected 4de7d30668cb8b06330992e1cd336f91700a2ce7
- affected d1dd2e15c85e890a1cc9bde5ba07ae63331e5c73
- affected 0148fe458b5705e2fea7cb88294fed7e36066ca2
- affected 3.16.66 – < 3.17
- affected 4.9.163 – < 4.10
- affected 4.14.106 – < 4.15
- affected 4.19.28 – < 4.20
- affected 4.20.15 – < 4.21
- affected 5.0
- unaffected < 5.0
- unaffected 5.4.283 – ≤ 5.4.*
- unaffected 5.10.225 – ≤ 5.10.*
- unaffected 5.15.166 – ≤ 5.15.*
- unaffected 6.1.107 – ≤ 6.1.*
- unaffected 6.6.48 – ≤ 6.6.*
- unaffected 6.10.7 – ≤ 6.10.*
- unaffected 6.11 – ≤ *
References
References10
- https://git.kernel.org/stable/c/759e3e8c4a6a6b4e52ebc4547123a457f0ce90d4 (opens in a new tab)
- https://git.kernel.org/stable/c/c414000da1c2ea1ba9a5e5bb1a4ba774e51e202d (opens in a new tab)
- https://git.kernel.org/stable/c/52d99a69f3d556c6426048c9d481b912205919d8 (opens in a new tab)
- https://git.kernel.org/stable/c/0486d31dd8198e22b63a4730244b38fffce6d469 (opens in a new tab)
- https://git.kernel.org/stable/c/577d6c0619467fe90f7e8e57e45cb5bd9d936014 (opens in a new tab)
- https://git.kernel.org/stable/c/e5bb2988a310667abed66c7d3ffa28880cf0f883 (opens in a new tab)
- https://git.kernel.org/stable/c/c07ff8592d57ed258afee5a5e04991a48dbaf382 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-41496 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-45016)Record last updated .