{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2025-37915", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.967Z", "datePublished": "2025-05-20T15:21:46.440Z", "dateUpdated": "2025-06-04T12:57:28.827Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-06-04T12:57:28.827Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: drr: Fix double list add in class with netem as child qdisc\n\nAs described in Gerrard's report [1], there are use cases where a netem\nchild qdisc will make the parent qdisc's enqueue callback reentrant.\nIn the case of drr, there won't be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\n\nIn addition to checking for qlen being zero, this patch checks whether the\nclass was already added to the active_list (cl_is_active) before adding\nto the list to cover for the reentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_drr.c"], "versions": [{"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "5da3aad1a13e7edb8ff0778a444ccf49930313e9", "status": "affected", "versionType": "git"}, {"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "4b07ac06b0a712923255aaf2691637693fc7100d", "status": "affected", "versionType": "git"}, {"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "2968632880f1792007eedd12eeedf7f6e2b7e9f3", "status": "affected", "versionType": "git"}, {"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "4f0ecf50cdf76da95828578a92f130b653ac2fcf", "status": "affected", "versionType": "git"}, {"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "db205b92dfe0501e5b92fb7cf00971d0e44ba3eb", "status": "affected", "versionType": "git"}, {"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "26e75716b94d6ff9be5ea07d63675c4d189f30b4", "status": "affected", "versionType": "git"}, {"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "ab2248110738d4429668140ad22f530a9ee730e1", "status": "affected", "versionType": "git"}, {"version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea", "lessThan": "f99a3fbf023e20b626be4b0f042463d598050c9a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_drr.c"], "versions": [{"version": "5.0", "status": "affected"}, {"version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.294", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.238", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.182", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.138", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.90", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.28", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.6", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.4.294"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.238"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.182"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.138"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.90"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.28"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.14.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5da3aad1a13e7edb8ff0778a444ccf49930313e9"}, {"url": "https://git.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100d"}, {"url": "https://git.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3"}, {"url": "https://git.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcf"}, {"url": "https://git.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3eb"}, {"url": "https://git.kernel.org/stable/c/26e75716b94d6ff9be5ea07d63675c4d189f30b4"}, {"url": "https://git.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1"}, {"url": "https://git.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9a"}], "title": "net_sched: drr: Fix double list add in class with netem as child qdisc", 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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: drr: Fix double list add in class with netem as child qdisc\n\nAs described in Gerrard's report [1], there are use cases where a netem\nchild qdisc will make the parent qdisc's enqueue callback reentrant.\nIn the case of drr, there won't be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\n\nIn addition to checking for qlen being zero, this patch checks whether the\nclass was already added to the active_list (cl_is_active) before adding\nto the list to cover for the reentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net_sched: drr: Se corrige la doble adici\u00f3n de lista en la clase con netem como qdisc hija. Como se describe en el informe de Gerrard [1], existen casos de uso en los que una qdisc hija de netem har\u00e1 que la devoluci\u00f3n de llamada de encolado de la qdisc madre sea reentrante. En el caso de drr, no habr\u00e1 un UAF, pero el c\u00f3digo agregar\u00e1 el mismo clasificador a la lista dos veces, lo que causar\u00e1 corrupci\u00f3n de memoria. Adem\u00e1s de verificar que qlen sea cero, este parche verifica si la clase ya se agreg\u00f3 a active_list (cl_is_active) antes de agregarla a la lista para cubrir el caso reentrante. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"}], "id": "CVE-2025-37915", "lastModified": "2025-06-04T13:15:26.730", "metrics": {}, "published": "2025-05-20T16:15:28.057", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/26e75716b94d6ff9be5ea07d63675c4d189f30b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2968632880f1792007eedd12eeedf7f6e2b7e9f3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4b07ac06b0a712923255aaf2691637693fc7100d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4f0ecf50cdf76da95828578a92f130b653ac2fcf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5da3aad1a13e7edb8ff0778a444ccf49930313e9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ab2248110738d4429668140ad22f530a9ee730e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/db205b92dfe0501e5b92fb7cf00971d0e44ba3eb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f99a3fbf023e20b626be4b0f042463d598050c9a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: net_sched: drr: Fix double list add in class with netem as child qdisc", "id": "2367527", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2367527"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet_sched: drr: Fix double list add in class with netem as child qdisc\nAs described in Gerrard's report [1], there are use cases where a netem\nchild qdisc will make the parent qdisc's enqueue callback reentrant.\nIn the case of drr, there won't be a UAF, but the code will add the same\nclassifier to the list twice, which will cause memory corruption.\nIn addition to checking for qlen being zero, this patch checks whether the\nclass was already added to the active_list (cl_is_active) before adding\nto the list to cover for the reentrant case.\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/"], "name": "CVE-2025-37915", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37915\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37915\nhttps://lore.kernel.org/linux-cve-announce/2025052000-CVE-2025-37915-83e3@gregkh/T"], "threat_severity": "Moderate"}