{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-04-28T23:46:16.055","vulnerabilities":[{"cve":{"id":"CVE-2025-37797","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","published":"2025-05-02T15:15:48.557","lastModified":"2025-11-06T20:48:20.637","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: hfsc: Fix a UAF vulnerability in class handling\n\nThis patch fixes a Use-After-Free vulnerability in the HFSC qdisc class\nhandling. The issue occurs due to a time-of-check/time-of-use condition\nin hfsc_change_class() when working with certain child qdiscs like netem\nor codel.\n\nThe vulnerability works as follows:\n1. hfsc_change_class() checks if a class has packets (q.qlen != 0)\n2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g.,\n   codel, netem) might drop packets and empty the queue\n3. The code continues assuming the queue is still non-empty, adding\n   the class to vttree\n4. This breaks HFSC scheduler assumptions that only non-empty classes\n   are in vttree\n5. Later, when the class is destroyed, this can lead to a Use-After-Free\n\nThe fix adds a second queue length check after qdisc_peek_len() to verify\nthe queue wasn't emptied."},{"lang":"es","value":"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: hfsc: Se corrige una vulnerabilidad de UAF en la gestión de clases. Este parche corrige una vulnerabilidad de use-after-free en la gestión de clases de qdisc HFSC. El problema se produce debido a una condición de tiempo de comprobación/tiempo de uso en hfsc_change_class() al trabajar con ciertas qdiscs secundarias como netem o codel. La vulnerabilidad funciona de la siguiente manera: 1. hfsc_change_class() verifica si una clase tiene paquetes (q.qlen != 0) 2. Luego llama a qdisc_peek_len(), que para ciertos qdiscs (por ejemplo, codel, netem) puede descartar paquetes y vaciar la cola 3. El código continúa asumiendo que la cola todavía no está vacía, agregando la clase a vttree 4. Esto rompe las suposiciones del programador HFSC de que solo las clases no vacías están en vttree 5. Más tarde, cuando se destruye la clase, esto puede llevar a un Use-After-Free La solución agrega una segunda verificación de longitud de cola después de qdisc_peek_len() para verificar que la cola no se haya vaciado."}],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"weaknesses":[{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"CWE-416"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.1","versionEndExcluding":"5.4.293","matchCriteriaId":"8D3ABA83-8B6C-43AD-9878-0CA649728149"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.237","matchCriteriaId":"0710B81E-E2FA-4E15-8F68-D297EBB4D50D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.11","versionEndExcluding":"5.15.181","matchCriteriaId":"12331C9E-F601-4EFC-899E-369F98DCC70B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.136","matchCriteriaId":"27735C1B-DDFC-4860-8952-1D01025F9D4C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.89","matchCriteriaId":"D79CE030-3114-45E0-B52B-C77781BCB587"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.12.26","matchCriteriaId":"22F52099-F422-4D19-8283-45F9F9BF4392"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.14.5","matchCriteriaId":"6B25CA7E-4CD0-46DB-B4EF-13A3516071FB"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:-:*:*:*:*:*:*","matchCriteriaId":"7875AA30-1F6F-470C-A52D-ECBD6663CEC5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:rc2:*:*:*:*:*:*","matchCriteriaId":"B483DA9A-D449-48DE-9CA2-CEA23FD0B202"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:rc3:*:*:*:*:*:*","matchCriteriaId":"DEF29F06-4FF7-4FE6-B66D-9D758B182CF3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:rc4:*:*:*:*:*:*","matchCriteriaId":"17941A19-6A3D-477F-BC6A-972D7F815FDD"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:rc5:*:*:*:*:*:*","matchCriteriaId":"4C9B8FA6-754F-42F5-98BC-410AF7DB9F4C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:rc6:*:*:*:*:*:*","matchCriteriaId":"EC8F8565-B401-4F3C-B423-51F371DCB908"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:rc7:*:*:*:*:*:*","matchCriteriaId":"C834B5F2-810F-4291-8E1F-1B32635E08F3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:4.14:rc8:*:*:*:*:*:*","matchCriteriaId":"BB4A96BC-72CC-4EF1-916C-9ED7177C196E"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*","matchCriteriaId":"8D465631-2980-487A-8E65-40AE2B9F8ED1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*","matchCriteriaId":"4C9D071F-B28E-46EC-AC61-22B913390211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*","matchCriteriaId":"13FC0DDE-E513-465E-9E81-515702D49B74"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","matchCriteriaId":"FA6FEEC2-9F11-4643-8827-749718254FED"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/20d584a33e480ae80d105f43e0e7b56784da41b9","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/28b09a067831f7317c3841812276022d6c940677","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/39b9095dd3b55d9b2743df038c32138efa34a9de","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/3aa852e3605000d5c47035c3fc3a986d14ccfa9f","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/3df275ef0a6ae181e8428a6589ef5d5231e58b5c","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/86cd4641c713455a4f1c8e54c370c598c2b1cee0","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/bb583c88d23b72d8d16453d24856c99bd93dadf5","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://git.kernel.org/stable/c/fcc8ede663569c704fb00a702973bd6c00373283","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":["Patch"]},{"url":"https://lists.debian.org/debi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