Description (CNA)
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
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa before 4117c528b2de5fdc3e4a7e3626815b616a635cdc; affected 548cf048b426729a7a1fa6acd1271c010c9a7380 before f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0; affected c49ac48fac51a6a54efd5963954d02bacf075085 before 0692ce5a528df450d64e9f819054177e9d91076f; affected 58ae7465f0e7113d45aa88a66bf2d203c71c195e before e4192bcf83aaab02129644ddf4656fd86e93751f; affected 82bd38bd5467ece1ee274b493f51326cf5220a5a before f3820dce042a673fcb28cc31c87ee14257e21a17; affected e4650d7ae4252f67e997a632adfae0dd74d3a99a before 534cd7ecbbc6e8a974f4003a5c1557439c6e0a72; affected e4650d7ae4252f67e997a632adfae0dd74d3a99a before e6c1cb728e389354203a72bc77464c222a247aeb; affected e4650d7ae4252f67e997a632adfae0dd74d3a99a before fb9f88a33c516ea5c0bcd9a22ca288b246b34567; affected 843cacb88f42f426973f1ed11c6fb562558efb27; affected 5.10.239 before 5.10.271; affected 5.15.186 before 5.15.222; affected 6.1.129 before 6.1.189; affected 6.6.76 before 6.6.158; affected 6.12.13 before 6.12.111; affected 5.4.297 before 5.5 |
| Linux / Linux | affected 6.13; unaffected 0 before 6.13; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4117c528b2de5fdc3e4a7e3626815b616a635cdc
- https://git.kernel.org/stable/c/f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0
- https://git.kernel.org/stable/c/0692ce5a528df450d64e9f819054177e9d91076f
- https://git.kernel.org/stable/c/e4192bcf83aaab02129644ddf4656fd86e93751f
- https://git.kernel.org/stable/c/f3820dce042a673fcb28cc31c87ee14257e21a17
- https://git.kernel.org/stable/c/534cd7ecbbc6e8a974f4003a5c1557439c6e0a72
- https://git.kernel.org/stable/c/e6c1cb728e389354203a72bc77464c222a247aeb
- https://git.kernel.org/stable/c/fb9f88a33c516ea5c0bcd9a22ca288b246b34567