net/sched: hhf: clamp quantum before hhf_change() to avoid overflow
In the Linux kernel, the following vulnerability has been resolved: net/sched: hhf: clamp quantum before hhf_change() to avoid overflow hhf_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) with no overflow check. A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes weight * quantum overflow the signed deficit in hhf_dequeue(), spinning forever. Clamp q->quantum before hhf_change() so both the opt and !opt paths see a sane quantum. Without this, bare "tc qdisc add ... hhf" succeeds with a clamped quantum but "tc qdisc add ... hhf limit 1000" (any option present) fails with -EINVAL because hhf_change() re-validates the unclamped default (sch_hhf.c:559). 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.
CVE-2026-90073
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90073
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "2e0f0729f922c8de13801004e2131b57646c7c5f",
"versionType": "git"
},
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "0c66223e90ddb4fd3700965a9241f2fde7bd6bc7",
"versionType": "git"
},
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "20b65bf7ca06e48ec1d62ed8012f71205328dbe4",
"versionType": "git"
},
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "dea2789a9d5ff38bdd77f2e64d550430899e2839",
"versionType": "git"
},
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "fa9c2055f0a60f801ccf286af53d387dc6202c3f",
"versionType": "git"
},
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "99770b5d8e0e1c69b996f74a19d71afd2c4a9aa4",
"versionType": "git"
},
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "2446644b0f6d045b01db6acbaf55552dbec8a59a",
"versionType": "git"
},
{
"status": "affected",
"version": "10239edf86f137ce4c39b62ea9575e8053c549a0",
"lessThan": "2164b512b97bb053e8ce4d6e95576f11bed6a005",
"versionType": "git"
}
],
"programFiles": [
"net/sched/sch_hhf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/sch_hhf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90073
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36491 · Revision 1
- Added to Heist Feed
- Publisher date