CVE-2025-37914

Summary

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/

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 24388ba0a1b1b6d4af1b205927ac7f7b119ee4eaaffected
LinuxLinuxdcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 554acc5a2ea9703e08023eb9a003f9e5a830a502affected
LinuxLinuxdcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 9efb6a0fa88e0910d079fdfeb4f7ce4d4ac6c990affected
LinuxLinuxdcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 72c3da7e6ceb74e74ddbb5a305a35c9fdfcac6e3affected
LinuxLinuxdcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 1f01e9f961605eb397c6ecd1d7b0233dfbf9077caffected
LinuxLinuxdcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < bc321f714de693aae06e3786f88df2975376d996affected
LinuxLinuxdcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 < 1a6d0c00fa07972384b0c308c72db091d49988b6affected
LinuxLinux5.6affected
LinuxLinux0 < 5.6unaffected
LinuxLinux5.10.238 <= 5.10.*unaffected
LinuxLinux5.15.182 <= 5.15.*unaffected
LinuxLinux6.1.138 <= 6.1.*unaffected
LinuxLinux6.6.90 <= 6.6.*unaffected
LinuxLinux6.12.28 <= 6.12.*unaffected
LinuxLinux6.14.6 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References