CVE-2024-53057
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(-)
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2024-53057
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2024-53057.html
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/ce691c814bc7a3c30c220ffb5b7422715458fd9b
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/9995909615c3431a5304c1210face5f268d24dba
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/597cf9748c3477bf61bc35f0634129f56764ad24
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/580b3189c1972aff0f993837567d36392e9d981b
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/2e95c4384438adeaa772caa560244b1a2efef816
Vendor advisory: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 — https://git.kernel.org/stable/c/05df1b1dff8f197f1c275b57ccb2ca33021df552
Vendor advisory: redhat — https://access.redhat.com/errata/RHSA-2025:6966
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| rhel | 9 | fixed | |
| sles | affected | | |
| debian | bookworm | fixed | 6.1.119-1 |
| debian | bullseye | fixed | 5.10.234-1 |
| debian | forky | fixed | 6.11.7-1 |
| debian | sid | fixed | 6.11.7-1 |
| debian | trixie | fixed | 6.11.7-1 |
| linux-kernel | affected | 4.19.323 | |
| linux-kernel | 6.12 | affected | |
References
- https://access.redhat.com/errata/RHSA-2025:6966
- 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://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://www.suse.com/security/cve/CVE-2024-53057.html
- https://security-tracker.debian.org/tracker/CVE-2024-53057
CWEs
CWE-416
Verify integrity in audit chain (admin only). AS-IS.