CVE-2025-37913net_sched: qfq: Fix double list add in class with netem as child qdisc
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net_sched: qfq: 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 qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 041f410aec2c1751ee22b8b73ba05d38c3a6a602; 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea builds before 005a479540478a820c52de098e5e767e63e36f0a; 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea builds before 0bf32d6fb1fcbf841bb9945570e0e2a70072c00f; 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea builds before 0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before a43783119e01849fbf2fe8855634e8989b240cb4; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 53bc0b55178bd59bdd4bcd16349505cabf54b1a2; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before 370218e8ce711684acc4cdd3cc3c6dd7956bc165; from 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea before f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.0.1 before 5.4.294; from 5.5 before 5.10.238; from 5.11 before 5.15.182; from 5.16 before 6.1.138; from 6.2 before 6.6.90; from 6.7 before 6.12.28; from 6.13 before 6.14.6; 5.0; and 10 more ranges | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/041f410aec2c1751ee22b8b73ba05d38c3a6a602patch
- https://git.kernel.org/stable/c/005a479540478a820c52de098e5e767e63e36f0apatch
- https://git.kernel.org/stable/c/0bf32d6fb1fcbf841bb9945570e0e2a70072c00fpatch
- https://git.kernel.org/stable/c/0aa23e0856b7cedb3c88d8e3d281c212c7e4fbebpatch
- https://git.kernel.org/stable/c/a43783119e01849fbf2fe8855634e8989b240cb4patch
- https://git.kernel.org/stable/c/53bc0b55178bd59bdd4bcd16349505cabf54b1a2patch
- https://git.kernel.org/stable/c/370218e8ce711684acc4cdd3cc3c6dd7956bc165patch
- https://git.kernel.org/stable/c/f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4patch
- https://lists.debian.org/debian-lts-announce/2025/08/msg00010.htmlmailing-list
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlmailing-list
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.