Riskcovery

CVE-2025-37914

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

State
Published
Severity
7.8 High
Published
May 20, 2025
Updated
Oct 15, 2026
Reserved
Apr 16, 2025

Read the record on cve.org

Description

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

net_sched: ets: 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 ets, 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 doing the addition to cater for the reentrant case.

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

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to before 24388ba0a1b1b6d4af1b205927ac7f7b119ee4eaAffected
  • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to before 554acc5a2ea9703e08023eb9a003f9e5a830a502Affected
  • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to before 9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990Affected
  • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to before 72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3Affected
  • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to before 1f01e9f961605eb397c6ecd1d7b0233dfbf9077cAffected
  • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to before bc321f714de693aae06e3786f88df2975376d996Affected
  • dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 to before 1a6d0c00fa07972384b0c308c72db091d49988b6Affected
LinuxLinux
  • 5.6Affected
  • before 5.6Not affected
  • 5.10.238 through 5.10.*Not affected
  • 5.15.182 through 5.15.*Not affected
  • 6.1.138 through 6.1.*Not affected
  • 6.6.90 through 6.6.*Not affected
  • 6.12.28 through 6.12.*Not affected
  • 6.14.6 through 6.14.*Not affected
  • 6.15 and laterNot affected

References

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