CVE-2024-46800

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Source
https://cve.org/CVERecord?id=CVE-2024-46800
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-46800.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2024-46800
Downstream
Related
Published
2024-09-18T07:12:54.330Z
Modified
2026-03-11T07:51:13.558377Z
Summary
sch/netem: fix use after free in netem_dequeue
Details

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 _NETXMITSTOLEN. The packet is dropped but qdisctreereducebacklog() 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

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/46xxx/CVE-2024-46800.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
50612537e9ab29693122fab20fc1eed235054ffe
Fixed
f0bddb4de043399f16d1969dad5ee5b984a64e7b
Fixed
295ad5afd9efc5f67b86c64fce28fb94e26dc4c9
Fixed
98c75d76187944296068d685dfd8a1e9fd8c4fdc
Fixed
14f91ab8d391f249b845916820a56f42cf747241
Fixed
db2c235682913a63054e741fe4e19645fdf2d68e
Fixed
dde33a9d0b80aae0c69594d1f462515d7ff1cb3d
Fixed
32008ab989ddcff1a485fa2b4906234c25dc5cd6
Fixed
3b3a2a9c6349e25a025d2330f479bc33a6ccb54a

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-46800.json"