GHSA-hhjv-qj57-f47fHighCVSS 7.8

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix WARNING in...

Published
September 17, 2026
Last Modified
September 18, 2026

🔗 CVE IDs covered (1)

CVE-2026-92485 →

📋 Description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix WARNING in bpf_tracing_link_release

The trampoline could be corrupted by the blindly 'tr->flags = BPF_TRAMP_F_TAIL_CALL_CTX' in verifier.

  1. A fexit attached to a tail_call_reachable prog. 'tr->flags' became 'BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_TAIL_CALL_CTX'. And, the trampoline would poke the target prog's nop insn using jmp insn instead of call insn.
  2. Another fexit loaded with the same tail_call_reachable prog target. 'tr->flags' became 'BPF_TRAMP_F_TAIL_CALL_CTX'.
  3. Close the first fexit link. Due to no BPF_TRAMP_F_CALL_ORIG in 'tr->flags', the trampoline will fail to restore the prog's nop insn using call insn.

[ 3.410719] WARNING: kernel/bpf/syscall.c:3551 at bpf_tracing_link_release+0x53/0x60, CPU#1: test_progs/98 ... [ 3.428793] bpf_link_free+0x58/0x130 [ 3.429293] bpf_link_release+0x23/0x30

Fix the warning by updating 'tr->flags' with '|=' and lock.

🔗 References (4)