{"id":"CVE-2026-46196","state":"PUBLISHED","title":"tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()\n\nWhen a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func()\ninvokes the subsystem's ext->regfunc() before attempting to install the\nnew probe via func_add(). If func_add() then fails (for example, when\nallocate_probes() cannot allocate a new probe array under memory pressure\nand returns -ENOMEM), the function returns the error without calling the\nmatching ext->unregfunc(), leaving the side effects of regfunc() behind\nwith no installed probe to justify them.\n\nFor syscall tracepoints this is particularly unpleasant: syscall_regfunc()\nbumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task.\nAfter a leaked failure, the refcount is stuck at a non-zero value with no\nconsumer, and every task continues paying the syscall trace entry/exit\noverhead until reboot. Other subsystems providing regfunc()/unregfunc()\npairs exhibit similarly scoped persistent state.\n\nMirror the existing 1 -> 0 cleanup and call ext->unregfunc() in the\nfunc_add() error path, gated on the same condition used there so the\nunwind is symmetric with the registration.","publishedAt":"2026-05-28T09:36:49.293Z","updatedAt":"2026-10-15T01:21:17.317Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"5787052e5f69beb649f3d6a80a8aa37d9e683e4e","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"4f1756d043e56ea2e9a6c858fb290a0cf6fc2251","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"36ff362235307af95152d510b53c2d9b8773a342","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"247ed8a969f981bfba3112fd4bb441eaa6cef59c","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"7bcadb3c2bc1cf60690e931aadd35fb7bd646a49","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"2c5b8eeea006eb694c81631cd5713d494b80be90","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"342829e042ac00f3d68d442ea92873fb6683f494","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"fad217e16fded7f3c09f8637b0f6a224d58b5f2e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/tracepoint.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.10","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/tracepoint.c"]}],"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/247ed8a969f981bfba3112fd4bb441eaa6cef59c","https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49","https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90","https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494","https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e","https://cert-portal.siemens.com/productcert/html/ssa-784472.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46196.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46196","state":"PUBLISHED","datePublished":"2026-05-28T09:36:49.293Z","dateUpdated":"2026-10-15T01:21:17.317Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.104Z"},"containers":{"cna":{"title":"tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntracepoint: balance regfunc() on func_add() failure in tracepoint_add_func()\n\nWhen a tracepoint goes through the 0 -> 1 transition, tracepoint_add_func()\ninvokes the subsystem's ext->regfunc() before attempting to install the\nnew probe via func_add(). If func_add() then fails (for example, when\nallocate_probes() cannot allocate a new probe array under memory pressure\nand returns -ENOMEM), the function returns the error without calling the\nmatching ext->unregfunc(), leaving the side effects of regfunc() behind\nwith no installed probe to justify them.\n\nFor syscall tracepoints this is particularly unpleasant: syscall_regfunc()\nbumps sys_tracepoint_refcount and sets SYSCALL_TRACEPOINT on every task.\nAfter a leaked failure, the refcount is stuck at a non-zero value with no\nconsumer, and every task continues paying the syscall trace entry/exit\noverhead until reboot. Other subsystems providing regfunc()/unregfunc()\npairs exhibit similarly scoped persistent state.\n\nMirror the existing 1 -> 0 cleanup and call ext->unregfunc() in the\nfunc_add() error path, gated on the same condition used there so the\nunwind is symmetric with the registration."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"5787052e5f69beb649f3d6a80a8aa37d9e683e4e","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"4f1756d043e56ea2e9a6c858fb290a0cf6fc2251","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"36ff362235307af95152d510b53c2d9b8773a342","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"247ed8a969f981bfba3112fd4bb441eaa6cef59c","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"7bcadb3c2bc1cf60690e931aadd35fb7bd646a49","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"2c5b8eeea006eb694c81631cd5713d494b80be90","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"342829e042ac00f3d68d442ea92873fb6683f494","versionType":"git"},{"version":"8cf868affdc459beee1a941df0cfaba1673740e3","status":"affected","lessThan":"fad217e16fded7f3c09f8637b0f6a224d58b5f2e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/tracepoint.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.10","versionType":"semver"},{"version":"5.10.259","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.210","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.176","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.140","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.88","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.30","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.7","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/tracepoint.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/5787052e5f69beb649f3d6a80a8aa37d9e683e4e"},{"url":"https://git.kernel.org/stable/c/4f1756d043e56ea2e9a6c858fb290a0cf6fc2251"},{"url":"https://git.kernel.org/stable/c/36ff362235307af95152d510b53c2d9b8773a342"},{"url":"https://git.kernel.org/stable/c/247ed8a969f981bfba3112fd4bb441eaa6cef59c"},{"url":"https://git.kernel.org/stable/c/7bcadb3c2bc1cf60690e931aadd35fb7bd646a49"},{"url":"https://git.kernel.org/stable/c/2c5b8eeea006eb694c81631cd5713d494b80be90"},{"url":"https://git.kernel.org/stable/c/342829e042ac00f3d68d442ea92873fb6683f494"},{"url":"https://git.kernel.org/stable/c/fad217e16fded7f3c09f8637b0f6a224d58b5f2e"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-06-19T11:59:59.175Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.10.259"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"5.15.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.1.176"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.6.140"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.12.88"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"6.18.30"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"7.0.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.10","versionEndExcluding":"7.1"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"affected":[{"vendor":"Siemens","product":"SIMATIC S7-1500 TM MFP - 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