net/sched: ets: clamp quantum in parse and fallback paths

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98009
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:29 UTC
Updated2026-09-25 11:17:29 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/sched: ets: clamp quantum in parse and fallback paths ets_qdisc_change() falls back to psched_mtu() with no floor for bands without an explicit quantum. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so a zero psched_mtu on a headerless device makes the deficit-refill loop spin under the qdisc lock. Move the floor into ets_quantum_parse() so explicitly configured quanta are also clamped to [256, 1<<20], not just the fallback path. Conditions to recreate the bug: CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.053900000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 99ae477b892e203a37985ebc56f0063e072f7f4b git Not specified
CNA Linux Linux affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 8f80b113dea0bed3c1a31a4224b72775cd9ec52d git Not specified
CNA Linux Linux affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 de22c30ec5598aca8797f02082d2ee1358dfa3ff git Not specified
CNA Linux Linux affected dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 1c38487f46b243bfeefec0c0c86023a3904f2214 git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/99ae477b892e203a37985ebc56f0063e072f7f4b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8f80b113dea0bed3c1a31a4224b72775cd9ec52d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1c38487f46b243bfeefec0c0c86023a3904f2214 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/de22c30ec5598aca8797f02082d2ee1358dfa3ff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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