{"id":"CVE-2026-98010","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: drr: clamp quantum in change class\n\ndrr_change_class() rejects explicit quantum==0 but falls back to\npsched_mtu() with no floor","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: drr: clamp quantum in change class\n\ndrr_change_class() rejects explicit quantum==0 but falls back to\npsched_mtu() with no floor. With a crafted size table qd…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"vendor":"Linux","product":"Linux","affected":["Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < e2297bbf9cf6ece86f1d1f8c683517a994990f9e","Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < 560794ee6e040b6e1c4ac2b3c8909f341a4596ee","Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < 23fea7e6736b2e1c6f6f2f05cccf33d36834da73","Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < b464affe9f9dfe41ac48930c376e3fb8596651b0","Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < dc8b374214ef5bba4882bbd95b361e42555cfc0d","Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < d43cded350fe1218493ad3d37a276aff14108ae6","Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < 8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b","Linux >= 13d2a1d2b032de08d7dcab6a1edcd47802681f96 < 8382abec0f1568d0a5590d75a3df92f23fcf5196","Linux 2.6.29"],"published":"2026-09-25","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:24.017","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98010","references":[{"url":"https://git.kernel.org/stable/c/23fea7e6736b2e1c6f6f2f05cccf33d36834da73","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/560794ee6e040b6e1c4ac2b3c8909f341a4596ee","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8382abec0f1568d0a5590d75a3df92f23fcf5196","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b464affe9f9dfe41ac48930c376e3fb8596651b0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d43cded350fe1218493ad3d37a276aff14108ae6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dc8b374214ef5bba4882bbd95b361e42555cfc0d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e2297bbf9cf6ece86f1d1f8c683517a994990f9e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98010.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98010"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541141"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98010"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98010"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98010.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00177,"epssPercentile":0.07163,"cvssSource":"vendor","ingestedAt":"2026-09-25T11:06:38.859Z","slug":"CVE-2026-98010","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: drr: clamp quantum in change class\n\ndrr_change_class() rejects explicit quantum==0 but falls back to\npsched_mtu() with no floor. With a crafted size table qdisc_pkt_len\nreaches ~2 GiB, so quantum=1 (or a zero psched_mtu on a headerless\ndevice) makes the deficit-refill loop spin under the qdisc lock.\n\nAdd clamp_t(u32, quantum, 256, 1<<20) after the zero reject and on the\nfallback path. The explicit-zero reject is preserved.\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_DRR=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root drr\n  tc class add dev dummy0 parent 1: classid 1:1 drr quantum 1\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98010.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212509,"id":"CVE-2026-98010","ts":1790668195041,"field":"cvss","old":null,"new":"5.5"},{"seq":212508,"id":"CVE-2026-98010","ts":1790668195041,"field":"severity","old":"none","new":"medium"}]}