{"id":"CVE-2024-53057","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT\n\nIn qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed\nto be either root or ingress","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT\n\nIn qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed\nto be either root or ingress. This assu…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.25, < 4.19.323","linux_kernel >= 4.20, < 5.4.285","linux_kernel >= 5.5, < 5.10.229","linux_kernel >= 5.11, < 5.15.171","linux_kernel >= 5.16, < 6.1.116","linux_kernel >= 6.2, < 6.6.60","linux_kernel >= 6.7, < 6.11.7","linux_kernel = 6.12"],"patched":["linux_kernel 6.11.7"],"published":"2024-11-19","updated":"2026-10-15","sourceUpdated":"2026-10-15T01:19:13.497","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2024-53057","references":[{"url":"https://git.kernel.org/stable/c/05df1b1dff8f197f1c275b57ccb2ca33021df552","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2e95c4384438adeaa772caa560244b1a2efef816","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/580b3189c1972aff0f993837567d36392e9d981b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/597cf9748c3477bf61bc35f0634129f56764ad24","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9995909615c3431a5304c1210face5f268d24dba","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ce691c814bc7a3c30c220ffb5b7422715458fd9b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-265688.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-355557.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-398330.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00293,"epssPercentile":0.22033,"ingestedAt":"2026-10-15T03:30:12.769Z","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2024-12-11T14:25:23.594430Z"},"slug":"CVE-2024-53057","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT\n\nIn qdisc_tree_reduce_backlog, Qdiscs with major handle ffff: are assumed\nto be either root or ingress. This assumption is bogus since it's valid\nto create egress qdiscs with major handle ffff:\nBudimir Markovic found that for qdiscs like DRR that maintain an active\nclass list, it will cause a UAF with a dangling class pointer.\n\nIn 066a3b5b2346, the concern was to avoid iterating over the ingress\nqdisc since its parent is itself. The proper fix is to stop when parent\nTC_H_ROOT is reached because the only way to retrieve ingress is when a\nhierarchy which does not contain a ffff: major handle call into\nqdisc_lookup with TC_H_MAJ(TC_H_ROOT).\n\nIn the scenario where major ffff: is an egress qdisc in any of the tree\nlevels, the updates will also propagate to TC_H_ROOT, which then the\niteration must stop.\n\n\n net/sched/sch_api.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)\n\n## Affected\n\n- `linux_kernel >= 2.6.25, < 4.19.323`\n- `linux_kernel >= 4.20, < 5.4.285`\n- `linux_kernel >= 5.5, < 5.10.229`\n- `linux_kernel >= 5.11, < 5.15.171`\n- `linux_kernel >= 5.16, < 6.1.116`\n- `linux_kernel >= 6.2, < 6.6.60`\n- `linux_kernel >= 6.7, < 6.11.7`\n- `linux_kernel = 6.12`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.11.7`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}