CVE-2025-37915
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.20%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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 active_list (cl_is_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/
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.20% probability · 10th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-415
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/26e75716b94d6ff9be5ea07d63675c4d189f30b4Patch
- https://git.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3Patch
- https://git.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100dPatch
- https://git.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcfPatch
- https://git.kernel.org/stable/c/5da3aad1a13e7edb8ff0778a444ccf49930313e9Patch
- https://git.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1Patch
- https://git.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3ebPatch
- https://git.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9aPatch
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.htmlMailing List
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlMailing List
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.