UBUNTU-CVE-2024-53057
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(-)
02 / AFFECTED SOFTWARE
Affected packages
56 explicit affected versions
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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(-)
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/2e95c4384438adeaa772caa560244b1a2efef816
- https://git.kernel.org/stable/c/05df1b1dff8f197f1c275b57ccb2ca33021df552
- https://git.kernel.org/stable/c/2e95c4384438adeaa772caa560244b1a2efef816
- https://git.kernel.org/stable/c/580b3189c1972aff0f993837567d36392e9d981b
- https://git.kernel.org/stable/c/597cf9748c3477bf61bc35f0634129f56764ad24
- https://git.kernel.org/stable/c/9995909615c3431a5304c1210face5f268d24dba
- https://git.kernel.org/stable/c/ce691c814bc7a3c30c220ffb5b7422715458fd9b
- https://git.kernel.org/stable/c/dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20
- https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e
- https://ubuntu.com/security/CVE-2024-53057
- https://ubuntu.com/security/notices/USN-7163-1
- https://ubuntu.com/security/notices/USN-7167-1
- https://ubuntu.com/security/notices/USN-7167-2
- https://ubuntu.com/security/notices/USN-7169-1
- https://ubuntu.com/security/notices/USN-7169-2
- https://ubuntu.com/security/notices/USN-7169-3
- https://ubuntu.com/security/notices/USN-7169-4
- https://ubuntu.com/security/notices/USN-7169-5
- https://ubuntu.com/security/notices/USN-7170-1
- https://ubuntu.com/security/notices/USN-7173-1
- https://ubuntu.com/security/notices/USN-7173-2
- https://ubuntu.com/security/notices/USN-7173-3
- https://ubuntu.com/security/notices/USN-7179-1
- https://ubuntu.com/security/notices/USN-7179-2
- https://ubuntu.com/security/notices/USN-7179-3
- https://ubuntu.com/security/notices/USN-7179-4
- https://ubuntu.com/security/notices/USN-7183-1
- https://ubuntu.com/security/notices/USN-7184-1
- https://ubuntu.com/security/notices/USN-7185-1
- https://ubuntu.com/security/notices/USN-7185-2
- https://ubuntu.com/security/notices/USN-7186-1
- https://ubuntu.com/security/notices/USN-7186-2
- https://ubuntu.com/security/notices/USN-7194-1
- https://ubuntu.com/security/notices/USN-7195-1
- https://ubuntu.com/security/notices/USN-7195-2
- https://ubuntu.com/security/notices/USN-7196-1
- https://ubuntu.com/security/notices/USN-7413-1
- https://www.cve.org/CVERecord?id=CVE-2024-53057