CVE-2025-37915

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Source
https://cve.org/CVERecord?id=CVE-2025-37915
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37915.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-37915
Downstream
Related
Published
2025-05-20T15:21:46.440Z
Modified
2026-03-11T07:51:28.811046Z
Summary
net_sched: drr: Fix double list add in class with netem as child qdisc
Details

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

net_sched: drr: Fix double list add in class with netem as child qdisc

As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of drr, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption.

In addition to checking for qlen being zero, this patch checks whether the class was already added to the activelist (clis_active) before adding to the list to cover for the reentrant case.

[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37915.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
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea
Fixed
5da3aad1a13e7edb8ff0778a444ccf49930313e9
Fixed
4b07ac06b0a712923255aaf2691637693fc7100d
Fixed
2968632880f1792007eedd12eeedf7f6e2b7e9f3
Fixed
4f0ecf50cdf76da95828578a92f130b653ac2fcf
Fixed
db205b92dfe0501e5b92fb7cf00971d0e44ba3eb
Fixed
26e75716b94d6ff9be5ea07d63675c4d189f30b4
Fixed
ab2248110738d4429668140ad22f530a9ee730e1
Fixed
f99a3fbf023e20b626be4b0f042463d598050c9a

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37915.json"