CVE-2025-38107

Summary

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

net_sched: ets: fix a race in ets_qdisc_change()

Gerrard Tai reported a race condition in ETS, whenever SFQ perturb timer fires at the wrong time.

The race is as follows:

CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put()

This can be abused to underflow a parent's qlen.

Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux699d82e9a6db29d509a71f1f2f4316231e6232e6 < eb7b74e9754e1ba2088f914ad1f57a778b11894baffected
LinuxLinuxce881ddbdc028fb1988b66e40e45ca0529c23b46 < 0b479d0aa488cb478eb2e1d8868be946ac8afb4faffected
LinuxLinuxb05972f01e7d30419987a1f221b5593668fd6448 < 347867cb424edae5fec1622712c8dd0a2c42918faffected
LinuxLinuxb05972f01e7d30419987a1f221b5593668fd6448 < 0383b25488a545be168744336847549d4a2d3d6caffected
LinuxLinuxb05972f01e7d30419987a1f221b5593668fd6448 < 073f64c03516bcfaf790f8edc772e0cfb8a84ec3affected
LinuxLinuxb05972f01e7d30419987a1f221b5593668fd6448 < fed94bd51d62d2e0e006aa61480e94e5cd0582b0affected
LinuxLinuxb05972f01e7d30419987a1f221b5593668fd6448 < d92adacdd8c2960be856e0b82acc5b7c5395fddbaffected
LinuxLinuxfffa19b5e58c34004a0d6f642d9c24b11d213994affected
LinuxLinuxfb155f6597cd7bc3aeed668c3bb15fc3b7cb257daffected
LinuxLinux5.10.142 < 5.10.239affected
LinuxLinux5.15.66 < 5.15.186affected
LinuxLinux5.4.213 < 5.5affected
LinuxLinux5.19.8 < 5.20affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux5.10.239 <= 5.10.*unaffected
LinuxLinux5.15.186 <= 5.15.*unaffected
LinuxLinux6.1.142 <= 6.1.*unaffected
LinuxLinux6.6.94 <= 6.6.*unaffected
LinuxLinux6.12.34 <= 6.12.*unaffected
LinuxLinux6.15.3 <= 6.15.*unaffected
LinuxLinux6.16 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References