Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:net/sched: cls_api: fix error handling causing NULL dereferencetcf_exts_miss_cookie_base_alloc() calls xa_alloc_cyclic() which canreturn 1 if the allocation succeeded after wrapping. This was treated asan error, with value 1 returned to caller tcf_exts_init_ex() which setsexts->actions to NULL and returns 1 to caller fl_change().fl_change() treats err == 1 as success, calling tcf_exts_validate_ex()which calls tcf_action_init() with exts->actions as argument, where itis dereferenced.Example trace:BUG: kernel NULL pointer dereference, address: 0000000000000000CPU: 114 PID: 16151 Comm: handler114 Kdump: loaded Not tainted 5.14.0-503.16.1.el9_5.x86_64 #1RIP: 0010:tcf_action_init+0x1f8/0x2c0Call Trace: tcf_action_init+0x1f8/0x2c0 tcf_exts_validate_ex+0x175/0x190 fl_change+0x537/0x1120 [cls_flower]
No PoCs from references.
- https://github.com/fkie-cad/nvd-json-data-feeds