net/sched: fq_pie: clamp default quantum to avoid signed overflow

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90074
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:16:56 UTC
Updated2026-09-17 17:16:56 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net/sched: fq_pie: clamp default quantum to avoid signed overflow fq_pie_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) without clamping. A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return 0x80000000, which overflows the signed flow->deficit to INT_MIN in fq_pie_qdisc_dequeue(), causing an infinite loop and soft lockup. Emulate fq_pie_policy which is already bounded to [1, 1 << 20]; clamp the default to [256, 1 << 20]. 256 matches fq_codel's floor and is a sane minimum for a DRR quantum. Conditions to recreate the bug: a device whose MTU (plus hard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy device with max_mtu == 0 accepting MTU 2147483634). Requires CAP_NET_ADMIN in a user namespace.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 1f43e4dbc93b7d02761a024d5f895df823c07b72 git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a f7942b2693bc24c7d609a03d06f97bee3b0bd96a git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 6f1be05faecef4c0f9a008200209f66ef2e133f7 git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 435da3734a8e63d3067016accc977ed1d10aaaa0 git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795 git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a bf97fd2163ad1191ef8daa3d4df8372aee19e396 git Not specified
CNA Linux Linux affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 git Not specified
CNA Linux Linux affected 5.6 Not specified
CNA Linux Linux unaffected 5.6 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/bf97fd2163ad1191ef8daa3d4df8372aee19e396 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6f1be05faecef4c0f9a008200209f66ef2e133f7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/435da3734a8e63d3067016accc977ed1d10aaaa0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f43e4dbc93b7d02761a024d5f895df823c07b72 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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