CVSS
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Описание
Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: bpf: don't downgrade half-dead scalar zero spills to STACK_ZERO states.c:__clean_func_state() can downgrade scalar zero spill to STACK_ZERO in the following case: *(u64 *)(r10 - 8) = 0; ... checkpoint ... r1 = *(u32 *)(r10 - 4); ... no reads from r10-8 ... Here 4 bytes at r10-8 are dead and verifier changes scalar spill to a combination: 0000pppp (p stands for poison). Such a change breaks precision propagation chains. All places that produce STACK_ZERO should call bpf_mark_chain_precision() for the zero source. This patch fixes the bug in a simplest way possible: avoids converting stack spills of zero to STACK_ZERO. Two smarter approaches are possible: - do bpf_mark_chain_precision() from __clean_func_state() - check slot liveness information in check_stack_write_fixed_off() I investigated both and the changes required are a bit tricky, hence go with a simple fix for the time being.
Засегнати продукти
- Linux Linux: be23266b4a08540aa43d8503a2ea10247c8daebe преди 436fa689630b741a77ef8c4a6f426479affd5bac; be23266b4a08540aa43d8503a2ea10247c8daebe преди 2f3536bff8823d3c5fdbbe15e17bfca696cc2b2e
- Linux Linux: 7.1; преди 7.1; 7.2.7 до 7.2.*; от 7.3 нататък
История
- 25 септември 2026 Публикувано