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Message-ID: <2025070411-CVE-2025-38177-bd6c@gregkh> Date: Fri, 4 Jul 2025 14:47:12 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-38177: sch_hfsc: make hfsc_qlen_notify() idempotent From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe. The Linux kernel CVE team has assigned CVE-2025-38177 to this issue. Affected and fixed versions =========================== Fixed in 6.1.138 with commit 0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 Fixed in 6.6.90 with commit 9030a91235ae4845ec71902c3e0cecfc9ed1f2df Fixed in 6.12.28 with commit d06476714d2819b550e0cc39222347e2c8941c9d Fixed in 6.14.6 with commit c1175c4ad01dbc9c979d099861fa90a754f72059 Fixed in 6.15 with commit 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb 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-2025-38177 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_hfsc.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/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059 https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
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