CVE-2026-90074
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: fq_pie: clamp default quantum to avoid signed overflow
In 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.
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) |
|---|---|---|---|---|---|
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | 1f43e4dbc93b7d02761a024d5f895df823c07b72 | Unavailable | None listed |
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | f7942b2693bc24c7d609a03d06f97bee3b0bd96a | Unavailable | None listed |
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | 6f1be05faecef4c0f9a008200209f66ef2e133f7 | Unavailable | None listed |
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | 435da3734a8e63d3067016accc977ed1d10aaaa0 | Unavailable | None listed |
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f | Unavailable | None listed |
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795 | Unavailable | None listed |
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | bf97fd2163ad1191ef8daa3d4df8372aee19e396 | Unavailable | None listed |
| ec97ecf1ebe485a17cd8395a5f35e6b80b57665a | affected | git | c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 | 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) |
|---|---|---|---|---|---|
| 5.6 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 5.6 | Unavailable | None listed |
| 5.10.270 | unaffected | semver | Unavailable | 5.10.* | None listed |
| 5.15.221 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.188 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.157 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.110 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.52 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 7.2.6 | unaffected | semver | Unavailable | 7.2.* | None listed |
| 7.3 | unaffected | original_commit_for_fix | Unavailable | * | None listed |