CVE-2026-46196tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8cf868affdc459beee1a941df0cfaba1673740e3 before 5787052e5f69beb649f3d6a80a8aa37d9e683e4e; 8cf868affdc459beee1a941df0cfaba1673740e3 builds before 4f1756d043e56ea2e9a6c858fb290a0cf6fc2251; from 8cf868affdc459beee1a941df0cfaba1673740e3 before 36ff362235307af95152d510b53c2d9b8773a342; from 8cf868affdc459beee1a941df0cfaba1673740e3 before 247ed8a969f981bfba3112fd4bb441eaa6cef59c; 8cf868affdc459beee1a941df0cfaba1673740e3 builds before 7bcadb3c2bc1cf60690e931aadd35fb7bd646a49; 8cf868affdc459beee1a941df0cfaba1673740e3 builds before 2c5b8eeea006eb694c81631cd5713d494b80be90; from 8cf868affdc459beee1a941df0cfaba1673740e3 before 342829e042ac00f3d68d442ea92873fb6683f494; from 8cf868affdc459beee1a941df0cfaba1673740e3 before fad217e16fded7f3c09f8637b0f6a224d58b5f2e | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.10 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7 | NVD |
References
- https://git.kernel.org/stable/c/5787052e5f69beb649f3d6a80a8aa37d9e683e4e
- https://git.kernel.org/stable/c/4f1756d043e56ea2e9a6c858fb290a0cf6fc2251
- https://git.kernel.org/stable/c/36ff362235307af95152d510b53c2d9b8773a342
- https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59cpatch
- https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49patch
- https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90patch
- https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494patch
- https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2epatch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.