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Message-ID: <2025050210-CVE-2025-37797-2aab@gregkh> Date: Fri, 2 May 2025 16:16:11 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-37797: net_sched: hfsc: Fix a UAF vulnerability in class handling From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel. The vulnerability works as follows: 1. hfsc_change_class() checks if a class has packets (q.qlen != 0) 2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g., codel, netem) might drop packets and empty the queue 3. The code continues assuming the queue is still non-empty, adding the class to vttree 4. This breaks HFSC scheduler assumptions that only non-empty classes are in vttree 5. Later, when the class is destroyed, this can lead to a Use-After-Free The fix adds a second queue length check after qdisc_peek_len() to verify the queue wasn't emptied. The Linux kernel CVE team has assigned CVE-2025-37797 to this issue. Affected and fixed versions =========================== Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 5.4.293 with commit 28b09a067831f7317c3841812276022d6c940677 Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 5.10.237 with commit 39b9095dd3b55d9b2743df038c32138efa34a9de Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 5.15.181 with commit fcc8ede663569c704fb00a702973bd6c00373283 Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 6.1.136 with commit 20d584a33e480ae80d105f43e0e7b56784da41b9 Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 6.6.89 with commit 3aa852e3605000d5c47035c3fc3a986d14ccfa9f Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 6.12.26 with commit 86cd4641c713455a4f1c8e54c370c598c2b1cee0 Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 6.14.5 with commit bb583c88d23b72d8d16453d24856c99bd93dadf5 Issue introduced in 4.14 with commit 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 and fixed in 6.15-rc4 with commit 3df275ef0a6ae181e8428a6589ef5d5231e58b5c 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-2025-37797 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/28b09a067831f7317c3841812276022d6c940677 https://git.kernel.org/stable/c/39b9095dd3b55d9b2743df038c32138efa34a9de https://git.kernel.org/stable/c/fcc8ede663569c704fb00a702973bd6c00373283 https://git.kernel.org/stable/c/20d584a33e480ae80d105f43e0e7b56784da41b9 https://git.kernel.org/stable/c/3aa852e3605000d5c47035c3fc3a986d14ccfa9f https://git.kernel.org/stable/c/86cd4641c713455a4f1c8e54c370c598c2b1cee0 https://git.kernel.org/stable/c/bb583c88d23b72d8d16453d24856c99bd93dadf5 https://git.kernel.org/stable/c/3df275ef0a6ae181e8428a6589ef5d5231e58b5c
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