CVSS
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Оригинално описание
In the Linux kernel, the following vulnerability has been resolved: bpf: Skip detached progs in trampoline images that are still in use bpf_tramp_image_put() makes sure a trampoline image is not freed while a task may still be running in it, but nothing similar is done for the progs called by that image. Detach drops the last prog reference right away and the prog is freed after grace periods, on the basis that a task still in the traced function skips the fexit progs once the nop at ip_after_call is patched to a jump. That leaves out a task sleeping in a sleepable prog that runs before the detached one, which no grace period waits for: CPU 0 CPU 1 in image I, sleeping in prog S detach P from I's trampoline -> new image, bpf_tramp_image_put(I) bpf_prog_put(P), last ref grace periods, P freed back from S __bpf_prog_enter(P) call P->bpf_func If S and P are fexit progs the task is already past the patched jump, and fentry only images don't have one. On x86 this is an int3 in poisoned bpf_prog_pack memory: Oops: int3: 0000 [#1] SMP NOPTI CPU: 18 UID: 0 PID: 94573 Comm: x169 Not tainted 6.18.44 #1 PREEMPT(lazy) RIP: 0010:0xffffffffc0601d8d Call Trace: <TASK> ? bpf_trampoline_6442515411+0x1a4/0x21b bpf_lsm_bprm_committed_creds+0x5/0x10 security_bprm_committed_creds+0x5f/0x70 begin_new_exec+0x2d6/0x410 ... We hit this in production when progs attached through trampolines got detached while their hooks were busy, and it was independently found with a fuzzer and KASAN. Have the JITs emit a patchable nop in front of each prog call sequence and record it in the image. When a prog is detached, patch its nop to a jump over the call sequence. Progs that stay attached keep running for the tasks that are in the image, and ip_after_call isn't needed anymore.
Засегнати продукти
- Linux Linux: e21aa341785c679dd409c8cb71f864c00fe6c463 преди 967566ad325b42150483e81acb09ea9d800c00b8; e21aa341785c679dd409c8cb71f864c00fe6c463 преди 17637e1a581a22466ac3620a91e099683ff9cc6f; e21d2b92354b3cd25dd774ebb0f0e52ff04a7861; 85d177f56e5256e14b74a65940f981f6e3e8bb32; 5.10.28 преди 5.11; 5.11.11 преди 5.12
- Linux Linux: 5.12; преди 5.12; 7.2.10 до 7.2.*; от 7.3 нататък
История
- 18 октомври 2026 Публикувано