CVE-2024-53057

Summary

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

net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT

In qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed to be either root or ingress. This assumption is bogus since it's valid to create egress qdiscs with major handle ffff: Budimir Markovic found that for qdiscs like DRR that maintain an active class list, it will cause a UAF with a dangling class pointer.

In 066a3b5b2346, the concern was to avoid iterating over the ingress qdisc since its parent is itself. The proper fix is to stop when parent TC_H_ROOT is reached because the only way to retrieve ingress is when a hierarchy which does not contain a ffff: major handle call into qdisc_lookup with TC_H_MAJ(TC_H_ROOT).

In the scenario where major ffff: is an egress qdisc in any of the tree levels, the updates will also propagate to TC_H_ROOT, which then the iteration must stop.

net/sched/sch_api.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

Affected Software

VendorProductVersion RangeStatus
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < e7f9a6f97eb067599a74f3bcb6761976b0ed303eaffected
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20affected
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < ce691c814bc7a3c30c220ffb5b7422715458fd9baffected
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < 05df1b1dff8f197f1c275b57ccb2ca33021df552affected
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < 580b3189c1972aff0f993837567d36392e9d981baffected
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < 597cf9748c3477bf61bc35f0634129f56764ad24affected
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < 9995909615c3431a5304c1210face5f268d24dbaaffected
LinuxLinux066a3b5b2346febf9a655b444567b7138e3bb939 < 2e95c4384438adeaa772caa560244b1a2efef816affected
LinuxLinux2.6.25affected
LinuxLinux0 < 2.6.25unaffected
LinuxLinux4.19.323 <= 4.19.*unaffected
LinuxLinux5.4.285 <= 5.4.*unaffected
LinuxLinux5.10.229 <= 5.10.*unaffected
LinuxLinux5.15.171 <= 5.15.*unaffected
LinuxLinux6.1.116 <= 6.1.*unaffected
LinuxLinux6.6.60 <= 6.6.*unaffected
LinuxLinux6.11.7 <= 6.11.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

CVE Program Container

Additional References

Additional References

References