{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89750", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.762Z", "datePublished": "2026-09-11T19:46:54.565Z", "dateUpdated": "2026-09-11T19:46:54.565Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:54.565Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/user_events: Clear copied tracing state before fork duplication\n\ndup_task_struct() copies user_event_mm from the parent into the child,\nwithout grabbing a reference to it. user_event_mm_dup() should\nreplace it, but it leaves that copied pointer unmodified if\nuser_event_mm_alloc() fails.\n\nWhen the child exits, user_event_mm_remove() decrements a reference\nthe child never owned, which ultimately frees user_event_mm, while\nthe parent still as a stale pointer to it. This creates a UAF, which\nKASAN reports as:\n\n BUG: KASAN: slab-use-after-free in\n current_user_event_mm+0x51/0x1d0 Write of size 4 at addr\n ffff888005010d30 by task init/44\n\n Call Trace:\n <TASK>\n kasan_report+0xce/0x100\n kasan_check_range+0x10f/0x1e0\n current_user_event_mm+0x51/0x1d0\n user_events_ioctl+0x82e/0x15c0\n __x64_sys_ioctl+0x139/0x1c0\n do_syscall_64+0xce/0x450\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n Allocated by task 44:\n __kasan_kmalloc+0x8f/0xa0\n __kmalloc_cache_noprof+0x180/0x3a0\n user_event_mm_alloc+0x3c/0x1f0\n current_user_event_mm+0x88/0x1d0\n\n Freed by task 42:\n __kasan_slab_free+0x43/0x70\n kfree+0x13a/0x390\n process_one_work+0x696/0xf90\n worker_thread+0x420/0xba0\n\nThe fix simply clears the copied pointer before any possible failure.\nIn case of failure, the child then has nothing to free."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_user.c"], "versions": [{"version": "7235759084a4f8524a46bd2638885ff3b34ce279", "lessThan": "63b39e49a4c9d68e010e96b26fc7374f0864f2b1", "status": "affected", "versionType": "git"}, {"version": "7235759084a4f8524a46bd2638885ff3b34ce279", "lessThan": "25a0758cf6bdbfddac2be71124c9bd0692f4b0b1", "status": "affected", "versionType": "git"}, {"version": "7235759084a4f8524a46bd2638885ff3b34ce279", "lessThan": "b799f67119aff179719a0b1e12441ebbdaaf62f9", "status": "affected", "versionType": "git"}, {"version": "7235759084a4f8524a46bd2638885ff3b34ce279", "lessThan": "390f6bd8583d177029d9df4bea6667509e55a765", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_user.c"], "versions": [{"version": "6.4", "status": "affected"}, {"version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/63b39e49a4c9d68e010e96b26fc7374f0864f2b1"}, {"url": "https://git.kernel.org/stable/c/25a0758cf6bdbfddac2be71124c9bd0692f4b0b1"}, {"url": "https://git.kernel.org/stable/c/b799f67119aff179719a0b1e12441ebbdaaf62f9"}, {"url": "https://git.kernel.org/stable/c/390f6bd8583d177029d9df4bea6667509e55a765"}], "title": "tracing/user_events: Clear copied tracing state before fork duplication", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/trace/trace_events_user.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "63b39e49a4c9d68e010e96b26fc7374f0864f2b1", "status": "affected", "version": "7235759084a4f8524a46bd2638885ff3b34ce279", "versionType": "git"}, {"lessThan": "25a0758cf6bdbfddac2be71124c9bd0692f4b0b1", "status": "affected", "version": "7235759084a4f8524a46bd2638885ff3b34ce279", "versionType": "git"}, {"lessThan": "b799f67119aff179719a0b1e12441ebbdaaf62f9", "status": "affected", "version": "7235759084a4f8524a46bd2638885ff3b34ce279", "versionType": "git"}, {"lessThan": "390f6bd8583d177029d9df4bea6667509e55a765", "status": "affected", "version": "7235759084a4f8524a46bd2638885ff3b34ce279", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/trace/trace_events_user.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.4"}, {"lessThan": "6.4", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing/user_events: Clear copied tracing state before fork duplication\n\ndup_task_struct() copies user_event_mm from the parent into the child,\nwithout grabbing a reference to it. user_event_mm_dup() should\nreplace it, but it leaves that copied pointer unmodified if\nuser_event_mm_alloc() fails.\n\nWhen the child exits, user_event_mm_remove() decrements a reference\nthe child never owned, which ultimately frees user_event_mm, while\nthe parent still as a stale pointer to it. This creates a UAF, which\nKASAN reports as:\n\n BUG: KASAN: slab-use-after-free in\n current_user_event_mm+0x51/0x1d0 Write of size 4 at addr\n ffff888005010d30 by task init/44\n\n Call Trace:\n <TASK>\n kasan_report+0xce/0x100\n kasan_check_range+0x10f/0x1e0\n current_user_event_mm+0x51/0x1d0\n user_events_ioctl+0x82e/0x15c0\n __x64_sys_ioctl+0x139/0x1c0\n do_syscall_64+0xce/0x450\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n Allocated by task 44:\n __kasan_kmalloc+0x8f/0xa0\n __kmalloc_cache_noprof+0x180/0x3a0\n user_event_mm_alloc+0x3c/0x1f0\n current_user_event_mm+0x88/0x1d0\n\n Freed by task 42:\n __kasan_slab_free+0x43/0x70\n kfree+0x13a/0x390\n process_one_work+0x696/0xf90\n worker_thread+0x420/0xba0\n\nThe fix simply clears the copied pointer before any possible failure.\nIn case of failure, the child then has nothing to free."}], "id": "CVE-2026-89750", "lastModified": "2026-09-11T20:20:05.883", "metrics": {}, "published": "2026-09-11T20:20:05.883", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/25a0758cf6bdbfddac2be71124c9bd0692f4b0b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/390f6bd8583d177029d9df4bea6667509e55a765"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63b39e49a4c9d68e010e96b26fc7374f0864f2b1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b799f67119aff179719a0b1e12441ebbdaaf62f9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Use-After-Free in tracing/user_events component", "id": "2532248", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532248"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's tracing/user_events component. This vulnerability arises when a child process, created via `fork`, exits and frees memory that the parent process still references. This creates a Use-After-Free (UAF) condition, where the parent process attempts to access freed memory. A local attacker could exploit this flaw to cause memory corruption, potentially leading to a denial of service or privilege escalation."], "name": "CVE-2026-89750", "public_date": "2026-09-11T19:46:54Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89750\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89750\nhttps://git.kernel.org/stable/c/25a0758cf6bdbfddac2be71124c9bd0692f4b0b1\nhttps://git.kernel.org/stable/c/390f6bd8583d177029d9df4bea6667509e55a765\nhttps://git.kernel.org/stable/c/63b39e49a4c9d68e010e96b26fc7374f0864f2b1\nhttps://git.kernel.org/stable/c/b799f67119aff179719a0b1e12441ebbdaaf62f9"], "threat_severity": "Moderate"}

{}