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Message-ID: <2024111928-CVE-2024-53057-a3a5@gregkh> Date: Tue, 19 Nov 2024 18:19:39 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-53057: net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT 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(-) The Linux kernel CVE team has assigned CVE-2024-53057 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 4.19.323 with commit e7f9a6f97eb0 Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 5.4.285 with commit dbe778b08b51 Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 5.10.229 with commit ce691c814bc7 Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 5.15.171 with commit 05df1b1dff8f Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 6.1.116 with commit 580b3189c197 Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 6.6.60 with commit 597cf9748c34 Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 6.11.7 with commit 9995909615c3 Issue introduced in 2.6.25 with commit 066a3b5b2346 and fixed in 6.12 with commit 2e95c4384438 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-53057 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: net/sched/sch_api.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/e7f9a6f97eb067599a74f3bcb6761976b0ed303e https://git.kernel.org/stable/c/dbe778b08b5101df9e89bc06e0a3a7ecd2f4ef20 https://git.kernel.org/stable/c/ce691c814bc7a3c30c220ffb5b7422715458fd9b https://git.kernel.org/stable/c/05df1b1dff8f197f1c275b57ccb2ca33021df552 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/2e95c4384438adeaa772caa560244b1a2efef816
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