{"id":"CVE-2026-98010","published":"2026-09-25T11:17:29.320","lastModified":"2026-09-25T11:17:29.320","description":"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 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","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/8382abec0f1568d0a5590d75a3df92f23fcf5196","tags":[]},{"url":"https://git.kernel.org/stable/c/8f756ae1c87414ce9cc21b30e6e4c036d6e9e80b","tags":[]},{"url":"https://git.kernel.org/stable/c/d43cded350fe1218493ad3d37a276aff14108ae6","tags":[]},{"url":"https://git.kernel.org/stable/c/dc8b374214ef5bba4882bbd95b361e42555cfc0d","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}