Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2024-53057

net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.323, 5.4.285, 5.10.229, 5.15.171, 6.1.116, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

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(-)

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in e7f9a6f97eb067599a74f3bcb6761976b0ed303e; From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20; From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in ce691c814bc7a3c30c220ffb5b7422715458fd9b; From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in 05df1b1dff8f197f1c275b57ccb2ca33021df552; From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in 580b3189c1972aff0f993837567d36392e9d981b; From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in 597cf9748c3477bf61bc35f0634129f56764ad24; From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in 9995909615c3431a5304c1210face5f268d24dba; From 066a3b5b2346febf9a655b444567b7138e3bb939 · fixed in 2e95c4384438adeaa772caa560244b1a2efef816

  • Linux Linux

    2.6.25

  • KernelLinux

    From 2.6.25 · fixed in 4.19.323; From 4.20.0 · fixed in 5.4.285; From 5.5.0 · fixed in 5.10.229; From 5.11.0 · fixed in 5.15.171; From 5.16.0 · fixed in 6.1.116; From 6.2.0 · fixed in 6.6.60; From 6.7.0 · fixed in 6.11.7

References 8

git.kernel.org