CVE-2026-93111 PUBLISHED

bpf: Mark tracing_multi trampolines as ftrace managed

Assigner: Linux
Reserved: 17.09.2026 Published: 17.09.2026 Updated: 17.09.2026

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

bpf: Mark tracing_multi trampolines as ftrace managed

Since tracing_multi link does not set ftrace_managed, it would fail to release the tracing_multi link when attaching tracing_multi link and then attaching fentry link.

[ 3.714215] WARNING: kernel/bpf/trampoline.c:1727 at bpf_trampoline_multi_detach+0x20b/0x240, CPU#1: test_progs/97 ... [ 3.733170] bpf_tracing_multi_link_release+0x14/0x30 [ 3.733890] bpf_link_free+0x58/0x130 [ 3.734414] bpf_link_release+0x23/0x30

Fix it by setting 'ftrace_managed = true' in register_fentry_multi().

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from aef4dfa790b22d8052cfb78044eadbe03c876c39 to 280145253fd38fa975cc04963ddaf74c7f415011 (excl.)
  • affected from aef4dfa790b22d8052cfb78044eadbe03c876c39 to 30bdd6d1384d894931f113eb595636092d8e650c (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 7.2 is affected
  • unaffected from 0 to 7.2 (excl.)
  • unaffected from 7.2.6 to 7.2.* (incl.)
  • unaffected from 7.3-rc1 to * (incl.)

References