Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_flow: fix NULL pointer dereference on shared blocks flow_change() calls tcf_block_q() and dereferences q->handle to derive a default baseclass. Shared blocks leave block->q NULL, causing a NULL deref when a flow filter without a fully qualified baseclass is created on a shared block. Check tcf_block_shared() before accessing block->q and return -EINVAL for shared blocks. This avoids the null-deref shown below: ======================================================================= KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] RIP: 0010:flow_change (net/sched/cls_flow.c:508) Call Trace: tc_new_tfilter (net/sched/cls_api.c:2432) rtnetlink_rcv_msg (net/core/rtnetlink.c:6980) [...] =======================================================================
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
1abf272022cf1d18469405f47b4ec49c6a3125db to < 57f94ac7e953eece5ed4819605a18f3cdfc63dccaffected1abf272022cf1d18469405f47b4ec49c6a3125db to < 942813276edeb1741fa5b0a73471beb4e495fa08affected1abf272022cf1d18469405f47b4ec49c6a3125db to < cc707a4fd4c3b6ab2722e06bc359aa010e13d408affected1abf272022cf1d18469405f47b4ec49c6a3125db to < 4a09f72007201c9f667dc47f64517ec23eea65e5affected1abf272022cf1d18469405f47b4ec49c6a3125db to < 9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957eaffected1abf272022cf1d18469405f47b4ec49c6a3125db to < a208c3e1232997e9317887294c20008dfcb75449affected1abf272022cf1d18469405f47b4ec49c6a3125db to < 415ea0c973c754b9f375225807810eb9045f4293affected1abf272022cf1d18469405f47b4ec49c6a3125db to < 1a280dd4bd1d616a01d6ffe0de284c907b555504affected
Linux Linux
Default version status: affected
4.15affected0 to < 4.15unaffected5.10.253 to ≤ 5.10.*unaffected5.15.203 to ≤ 5.15.*unaffected6.1.168 to ≤ 6.1.*unaffected6.6.134 to ≤ 6.6.*unaffected6.12.81 to ≤ 6.12.*unaffected6.18.22 to ≤ 6.18.*unaffected6.19.12 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/57f94ac7e953eece5ed4819605a18f3cdfc63dcc ↗
- https://git.kernel.org/stable/c/942813276edeb1741fa5b0a73471beb4e495fa08 ↗
- https://git.kernel.org/stable/c/cc707a4fd4c3b6ab2722e06bc359aa010e13d408 ↗
- https://git.kernel.org/stable/c/4a09f72007201c9f667dc47f64517ec23eea65e5 ↗
- https://git.kernel.org/stable/c/9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e ↗
- https://git.kernel.org/stable/c/a208c3e1232997e9317887294c20008dfcb75449 ↗
- https://git.kernel.org/stable/c/415ea0c973c754b9f375225807810eb9045f4293 ↗
- https://git.kernel.org/stable/c/1a280dd4bd1d616a01d6ffe0de284c907b555504 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html ↗
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html ↗