CVE-2026-98012

CVE CVE-2026-98012EUVD EUVD-2026-86665Published 2026-09-25T10:23:35.000Z

What the advisory describes

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

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 7.2.7; 4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa; patch: 7.3-rc3; 5.10.239 <5.11; patch: 6.18.53; 5.15.186 <5.16; 5.4.297 <5.5; c49ac48fac51a6a54efd5963954d02bacf075085; e4650d7ae4252f67e997a632adfae0dd74d3a99a <534cd7ecbbc6e8a974f4003a5c1557439c6e0a72; 6.12.13 <6.12.111; 843cacb88f42f426973f1ed11c6fb562558efb27; 6.6.76 <6.7; 82bd38bd5467ece1ee274b493f51326cf5220a5a <f3820dce042a673fcb28cc31c87ee14257e21a17; e4650d7ae4252f67e997a632adfae0dd74d3a99a <e6c1cb728e389354203a72bc77464c222a247aeb; patch: 0; e4650d7ae4252f67e997a632adfae0dd74d3a99a <fb9f88a33c516ea5c0bcd9a22ca288b246b34567; 58ae7465f0e7113d45aa88a66bf2d203c71c195e; patch: 6.12.111; 548cf048b426729a7a1fa6acd1271c010c9a7380; 6.13; 6.1.129 <6.2

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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