In the Linux kernel, the following vulnerability has been resolved:
tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()
When a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func()
invokes the subsystem's ext->regfunc() before attempting to install the
new probe via func_add(). If func_add() then fails (for example, when
allocate_probes() cannot allocate a new probe array under memory pressure
and returns -ENOMEM), the function returns the error without calling the
matching ext->unregfunc(), leaving the side effects of regfunc() behind
with no installed probe to justify them.
For syscall tracepoints this is particularly unpleasant: syscall_regfunc()
bumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task.
After a leaked failure, the refcount is stuck at a non-zero value with no
consumer, and every task continues paying the syscall trace entry/exit
overhead until reboot. Other subsystems providing regfunc()/unregfunc()
pairs exhibit similarly scoped persistent state.
Mirror the existing 1 -> 0 cleanup and call ext->unregfunc() in the
func_add() error path, gated on the same condition used there so the
unwind is symmetric with the registration.
References
Configurations
Configuration 1 (hide)
|
History
10 Jun 2026, 19:18
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Linux linux Kernel
Linux |
|
| References | () https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c - Patch | |
| References | () https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90 - Patch | |
| References | () https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494 - Patch | |
| References | () https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49 - Patch | |
| References | () https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e - Patch | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| CWE | NVD-CWE-noinfo |
28 May 2026, 10:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-28 10:16
Updated : 2026-06-10 19:18
NVD link : CVE-2026-46196
Mitre link : CVE-2026-46196
CVE.ORG link : CVE-2026-46196
JSON object : View
Products Affected
linux
- linux_kernel
CWE