CVE-2026-98011
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
net/sched: hhf: clamp quantum in change and init paths
In the Linux kernel, the following vulnerability has been resolved: net/sched: hhf: clamp quantum in change and init paths hhf_change() accepts any quantum from userspace, including 1. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times under the qdisc lock (a soft lockup / denial of service). Add max(256U, ...) in hhf_change() matching fq_codel_change(). Clamp hhf_init() to [256, 1<<20] matching the siblings, and remove the old fallback that only set quantum=256 on overflow. Conditions to recreate the bug: CONFIG_NET_SCH_HHF=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root hhf tc qdisc change dev dummy0 root hhf quantum 1 stab data 32768 size_log 15 cell_log 0
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | a328698d046098e6f55b3b1460cac6bab577be58 | Unavailable | None listed |
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | c364ad3ab3c8a6bce469a5cbf02881ab1324c5da | Unavailable | None listed |
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | 2c6dd9fc86d446a03728c43f3b96d9ae29aa058f | Unavailable | None listed |
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | 6570f326a6a96bedf3d1d1dab6acc9f8c29104ec | Unavailable | None listed |
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | 1113b674307ffddd402524bd1fd9d7d5629b705b | Unavailable | None listed |
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | 2e77947bbf6c166e76c038663832d0914418f761 | Unavailable | None listed |
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | 0898c6f9fa9ce2632ae88bd0f34a878ccc6335af | Unavailable | None listed |
| 10239edf86f137ce4c39b62ea9575e8053c549a0 | affected | git | eb56a495f59baf6cad5ed80e3ffb9078098b1346 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 3.14 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 3.14 | Unavailable | None listed |
| 5.10.271 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.222 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.189 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.158 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.111 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.53 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.7 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |