{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98012","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:19:56.069Z","datePublished":"2026-09-25T10:23:35.934Z","dateUpdated":"2026-10-03T11:01:32.631Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-03T11:01:32.631Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sfq: clamp quantum in change path\n\nsfq_change() accepts any non-negative quantum (only rejects\n(int)ctl->quantum < 0). With a crafted size table qdisc_pkt_len reaches\n~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times\nunder the qdisc lock (a soft lockup / denial of service).\n\nAdd max(256U, ...) matching fq_codel_change(). Reject quantum > 1<<20\nwith -EINVAL, matching fq_codel_change() and the init clamp.\n\nConditions to recreate the bug:\n  CONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via\n  unshare -Urn suffices).\n\n  tc qdisc add dev dummy0 root sfq\n  tc qdisc change dev dummy0 root sfq quantum 1 stab data 32768 size_log 15 cell_log 0"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_sfq.c"],"versions":[{"version":"4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa","lessThan":"4117c528b2de5fdc3e4a7e3626815b616a635cdc","status":"affected","versionType":"git"},{"version":"548cf048b426729a7a1fa6acd1271c010c9a7380","lessThan":"f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0","status":"affected","versionType":"git"},{"version":"c49ac48fac51a6a54efd5963954d02bacf075085","lessThan":"0692ce5a528df450d64e9f819054177e9d91076f","status":"affected","versionType":"git"},{"version":"58ae7465f0e7113d45aa88a66bf2d203c71c195e","lessThan":"e4192bcf83aaab02129644ddf4656fd86e93751f","status":"affected","versionType":"git"},{"version":"82bd38bd5467ece1ee274b493f51326cf5220a5a","lessThan":"f3820dce042a673fcb28cc31c87ee14257e21a17","status":"affected","versionType":"git"},{"version":"e4650d7ae4252f67e997a632adfae0dd74d3a99a","lessThan":"534cd7ecbbc6e8a974f4003a5c1557439c6e0a72","status":"affected","versionType":"git"},{"version":"e4650d7ae4252f67e997a632adfae0dd74d3a99a","lessThan":"e6c1cb728e389354203a72bc77464c222a247aeb","status":"affected","versionType":"git"},{"version":"e4650d7ae4252f67e997a632adfae0dd74d3a99a","lessThan":"fb9f88a33c516ea5c0bcd9a22ca288b246b34567","status":"affected","versionType":"git"},{"version":"843cacb88f42f426973f1ed11c6fb562558efb27","status":"affected","versionType":"git"},{"version":"5.10.239","lessThan":"5.10.271","status":"affected","versionType":"semver"},{"version":"5.15.186","lessThan":"5.15.222","status":"affected","versionType":"semver"},{"version":"6.1.129","lessThan":"6.1.189","status":"affected","versionType":"semver"},{"version":"6.6.76","lessThan":"6.6.158","status":"affected","versionType":"semver"},{"version":"6.12.13","lessThan":"6.12.111","status":"affected","versionType":"semver"},{"version":"5.4.297","lessThan":"5.5","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sched/sch_sfq.c"],"versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc3","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":"5.10.239","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.186","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.129","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.76","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.13","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.3-rc3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.297"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4117c528b2de5fdc3e4a7e3626815b616a635cdc"},{"url":"https://git.kernel.org/stable/c/f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0"},{"url":"https://git.kernel.org/stable/c/0692ce5a528df450d64e9f819054177e9d91076f"},{"url":"https://git.kernel.org/stable/c/e4192bcf83aaab02129644ddf4656fd86e93751f"},{"url":"https://git.kernel.org/stable/c/f3820dce042a673fcb28cc31c87ee14257e21a17"},{"url":"https://git.kernel.org/stable/c/534cd7ecbbc6e8a974f4003a5c1557439c6e0a72"},{"url":"https://git.kernel.org/stable/c/e6c1cb728e389354203a72bc77464c222a247aeb"},{"url":"https://git.kernel.org/stable/c/fb9f88a33c516ea5c0bcd9a22ca288b246b34567"}],"title":"net/sched: sfq: clamp quantum in change path","x_generator":{"engine":"bippy-1.2.0"}}}}