tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()

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Summary

CVECVE-2026-46196
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:35 UTC
Updated2026-06-19 13:16:35 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.050080000 (date 2026-06-02)

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 5787052e5f69beb649f3d6a80a8aa37d9e683e4e git Not specified
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 4f1756d043e56ea2e9a6c858fb290a0cf6fc2251 git Not specified
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 36ff362235307af95152d510b53c2d9b8773a342 git Not specified
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 247ed8a969f981bfba3112fd4bb441eaa6cef59c git Not specified
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 7bcadb3c2bc1cf60690e931aadd35fb7bd646a49 git Not specified
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 2c5b8eeea006eb694c81631cd5713d494b80be90 git Not specified
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 342829e042ac00f3d68d442ea92873fb6683f494 git Not specified
CNA Linux Linux affected 8cf868affdc459beee1a941df0cfaba1673740e3 fad217e16fded7f3c09f8637b0f6a224d58b5f2e git Not specified
CNA Linux Linux affected 4.10 Not specified
CNA Linux Linux unaffected 4.10 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.88 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5787052e5f69beb649f3d6a80a8aa37d9e683e4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/36ff362235307af95152d510b53c2d9b8773a342 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4f1756d043e56ea2e9a6c858fb290a0cf6fc2251 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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