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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-53057

net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < e7f9a6f97eb067599a74f3bcb6761976b0ed303eaffected
  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20affected
  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < ce691c814bc7a3c30c220ffb5b7422715458fd9baffected
  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < 05df1b1dff8f197f1c275b57ccb2ca33021df552affected
  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < 580b3189c1972aff0f993837567d36392e9d981baffected
  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < 597cf9748c3477bf61bc35f0634129f56764ad24affected
  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < 9995909615c3431a5304c1210face5f268d24dbaaffected
  • 066a3b5b2346febf9a655b444567b7138e3bb939 to < 2e95c4384438adeaa772caa560244b1a2efef816affected

Linux Linux

Default version status: affected

  • 2.6.25affected
  • 0 to < 2.6.25unaffected
  • 4.19.323 to ≤ 4.19.*unaffected
  • 5.4.285 to ≤ 5.4.*unaffected
  • 5.10.229 to ≤ 5.10.*unaffected
  • 5.15.171 to ≤ 5.15.*unaffected
  • 6.1.116 to ≤ 6.1.*unaffected
  • 6.6.60 to ≤ 6.6.*unaffected
  • 6.11.7 to ≤ 6.11.*unaffected
  • 6.12 to ≤ *unaffected

References