CVE-2024-46800sch/netem: fix use after free in netem_dequeue
- 7.8HighCVSS base score
- 0.30%Exploitation in 30 daysEPSS · top 77% 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: sch/netem: fix use after free in netem_dequeue If netem_dequeue() enqueues packet to inner qdisc and that qdisc returns __NET_XMIT_STOLEN. The packet is dropped but qdisc_tree_reduce_backlog() is not called to update the parent's q.qlen, leading to the similar use-after-free as Commit e04991a48dbaf382 ("netem: fix return value if duplicate enqueue fails") Commands to trigger KASAN UaF: ip link add type dummy ip link set lo up ip link set dummy0 up tc qdisc add dev lo parent root handle 1: drr tc filter add dev lo parent 1: basic classid 1:1 tc class add dev lo classid 1:1 drr tc qdisc add dev lo parent 1:1 handle 2: netem tc qdisc add dev lo parent 2: handle 3: drr tc filter add dev lo parent 3: basic classid 3:1 action mirred egress redirect dev dummy0 tc class add dev lo classid 3:1 drr ping -c1 -W0.01 localhost # Trigger bug tc class del dev lo classid 1:1 tc class add dev lo classid 1:1 drr ping -c1 -W0.01 localhost # UaF
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 23 months later
· 23 months 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 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.30% · top 77% of all CVEs (13 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 50612537e9ab29693122fab20fc1eed235054ffe – < f0bddb4de043399f16d1969dad5ee5b984a64e7b
- affected 50612537e9ab29693122fab20fc1eed235054ffe – < 295ad5afd9efc5f67b86c64fce28fb94e26dc4c9
- affected 50612537e9ab29693122fab20fc1eed235054ffe – < 98c75d76187944296068d685dfd8a1e9fd8c4fdc
- affected 50612537e9ab29693122fab20fc1eed235054ffe – < 14f91ab8d391f249b845916820a56f42cf747241
- affected 50612537e9ab29693122fab20fc1eed235054ffe – < db2c235682913a63054e741fe4e19645fdf2d68e
- affected 50612537e9ab29693122fab20fc1eed235054ffe – < dde33a9d0b80aae0c69594d1f462515d7ff1cb3d
- affected 50612537e9ab29693122fab20fc1eed235054ffe – < 32008ab989ddcff1a485fa2b4906234c25dc5cd6
- affected 50612537e9ab29693122fab20fc1eed235054ffe – < 3b3a2a9c6349e25a025d2330f479bc33a6ccb54a
- affected 3.3
- unaffected < 3.3
- unaffected 4.19.322 – ≤ 4.19.*
- unaffected 5.4.284 – ≤ 5.4.*
- unaffected 5.10.226 – ≤ 5.10.*
- unaffected 5.15.167 – ≤ 5.15.*
- unaffected 6.1.110 – ≤ 6.1.*
- unaffected 6.6.51 – ≤ 6.6.*
- unaffected 6.10.10 – ≤ 6.10.*
- unaffected 6.11 – ≤ *
References
References10
- https://git.kernel.org/stable/c/f0bddb4de043399f16d1969dad5ee5b984a64e7b (opens in a new tab)
- https://git.kernel.org/stable/c/295ad5afd9efc5f67b86c64fce28fb94e26dc4c9 (opens in a new tab)
- https://git.kernel.org/stable/c/98c75d76187944296068d685dfd8a1e9fd8c4fdc (opens in a new tab)
- https://git.kernel.org/stable/c/14f91ab8d391f249b845916820a56f42cf747241 (opens in a new tab)
- https://git.kernel.org/stable/c/db2c235682913a63054e741fe4e19645fdf2d68e (opens in a new tab)
- https://git.kernel.org/stable/c/dde33a9d0b80aae0c69594d1f462515d7ff1cb3d (opens in a new tab)
- https://git.kernel.org/stable/c/32008ab989ddcff1a485fa2b4906234c25dc5cd6 (opens in a new tab)
- https://git.kernel.org/stable/c/3b3a2a9c6349e25a025d2330f479bc33a6ccb54a (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)
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-2024-42061 (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-2024-46800)Record last updated .