CVE-2026-98012
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: sfq: clamp quantum in change path
In the Linux kernel, the following vulnerability has been resolved: net/sched: sfq: clamp quantum in change path sfq_change() accepts any non-negative quantum (only rejects (int)ctl->quantum < 0). 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, ...) matching fq_codel_change(). Reject quantum > 1<<20 with -EINVAL, matching fq_codel_change() and the init clamp. Conditions to recreate the bug: CONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root sfq tc qdisc change dev dummy0 root sfq 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) |
|---|---|---|---|---|---|
| 4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa | affected | git | 4117c528b2de5fdc3e4a7e3626815b616a635cdc | Unavailable | None listed |
| 548cf048b426729a7a1fa6acd1271c010c9a7380 | affected | git | f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0 | Unavailable | None listed |
| c49ac48fac51a6a54efd5963954d02bacf075085 | affected | git | 0692ce5a528df450d64e9f819054177e9d91076f | Unavailable | None listed |
| 58ae7465f0e7113d45aa88a66bf2d203c71c195e | affected | git | e4192bcf83aaab02129644ddf4656fd86e93751f | Unavailable | None listed |
| 82bd38bd5467ece1ee274b493f51326cf5220a5a | affected | git | f3820dce042a673fcb28cc31c87ee14257e21a17 | Unavailable | None listed |
| e4650d7ae4252f67e997a632adfae0dd74d3a99a | affected | git | 534cd7ecbbc6e8a974f4003a5c1557439c6e0a72 | Unavailable | None listed |
| e4650d7ae4252f67e997a632adfae0dd74d3a99a | affected | git | e6c1cb728e389354203a72bc77464c222a247aeb | Unavailable | None listed |
| e4650d7ae4252f67e997a632adfae0dd74d3a99a | affected | git | fb9f88a33c516ea5c0bcd9a22ca288b246b34567 | Unavailable | None listed |
| 843cacb88f42f426973f1ed11c6fb562558efb27 | affected | git | Unavailable | Unavailable | None listed |
| 5.10.239 | affected | semver | 5.10.271 | Unavailable | None listed |
| 5.15.186 | affected | semver | 5.15.222 | Unavailable | None listed |
| 6.1.129 | affected | semver | 6.1.189 | Unavailable | None listed |
| 6.6.76 | affected | semver | 6.6.158 | Unavailable | None listed |
| 6.12.13 | affected | semver | 6.12.111 | Unavailable | None listed |
| 5.4.297 | affected | semver | 5.5 | 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) |
|---|---|---|---|---|---|
| 6.13 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.13 | 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 |