Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: skip hash tables in u32_bind_class() u32_walk() enumerates both struct tc_u_hnode and struct tc_u_knode through the walker callback. u32_bind_class() unconditionally casts the passed fh to tc_u_knode and accesses &n->res, so when fh is actually a tc_u_hnode, which has no tcf_result member, this results in a slab-out-of-bounds read of res->classid in tc_cls_bind_class(). The issue can be reproduced with the following commands: tc qdisc add dev lo root handle 1: hfsc tc class add dev lo parent 1: classid 1:1 hfsc sc rate 1000kbit tc filter add dev lo parent 1:1 protocol ip prio 1 u32 match u32 0 0 flowid 1:1 tc class add dev lo parent 1: classid 1:2 hfsc sc rate 2000kbit Fix this by skipping hash tables via the TC_U32_KEY(handle) check.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < 43e1a952d534fc0e173b513a24b19ce99bb60974affected07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < 07f57c7c47459e9bc75186b3af0fc2bc5be72f89affected07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < ec5f3005586a785689fd568361b0c5925cb1548baffected07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < 19d114b93c94bdef70496f26685c2a6b242f41b3affected07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < 594a064d603202b9ee21e07679d854e5c1750cc4affected07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < 31f26a95eeee926946809ac456c61a3217936a62affected07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < e71f8e9ed6f311410b14741f6012afe01869c0faaffected07d79fc7d94e3f884b8b1c95aa615b202bb5e4c1 to < 6d3724e616faf952c3adcf8414fc21a828ef3709affected
Linux Linux
Default version status: affected
4.14affected0 to < 4.14unaffected5.10.273 to ≤ 5.10.*unaffected5.15.224 to ≤ 5.15.*unaffected6.1.184 to ≤ 6.1.*unaffected6.6.153 to ≤ 6.6.*unaffected6.12.105 to ≤ 6.12.*unaffected6.18.46 to ≤ 6.18.*unaffected7.1.10 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/43e1a952d534fc0e173b513a24b19ce99bb60974 ↗
- https://git.kernel.org/stable/c/07f57c7c47459e9bc75186b3af0fc2bc5be72f89 ↗
- https://git.kernel.org/stable/c/ec5f3005586a785689fd568361b0c5925cb1548b ↗
- https://git.kernel.org/stable/c/19d114b93c94bdef70496f26685c2a6b242f41b3 ↗
- https://git.kernel.org/stable/c/594a064d603202b9ee21e07679d854e5c1750cc4 ↗
- https://git.kernel.org/stable/c/31f26a95eeee926946809ac456c61a3217936a62 ↗
- https://git.kernel.org/stable/c/e71f8e9ed6f311410b14741f6012afe01869c0fa ↗
- https://git.kernel.org/stable/c/6d3724e616faf952c3adcf8414fc21a828ef3709 ↗