Answer in brief
CVE-2026-89750 records a High severity (CVSS 7.8) vulnerability in tracing/user_events: Clear copied tracing state before fork duplication. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7235759084a4f8524a46bd2638885ff3b34ce279 <63b39e49a4c9d68e010e96b26fc7374f0864f2b1 || >=7235759084a4f8524a46bd2638885ff3b34ce279 <25a0758cf6bdbfddac2be71124c9bd0692f4b0b1 || >=7235759084a4f8524a46bd2638885ff3b34ce279 <b799f67119aff179719a0b1e12441ebbdaaf62f9 || >=7235759084a4f8524a46bd2638885ff3b34ce279 <390f6bd8583d177029d9df4bea6667509e55a765 | 63b39e49a4c9d68e010e96b26fc7374f0864f2b1, 25a0758cf6bdbfddac2be71124c9bd0692f4b0b1, b799f67119aff179719a0b1e12441ebbdaaf62f9, 390f6bd8583d177029d9df4bea6667509e55a765 |
| Linux/Linuxgeneric | 6.4 | Not reported |
| Linux/Linuxgeneric | >=7235759084a4f8524a46bd2638885ff3b34ce279 <33ce55b368b64d65941867add00e7f288cbb8234 || >=7235759084a4f8524a46bd2638885ff3b34ce279 <63b39e49a4c9d68e010e96b26fc7374f0864f2b1 || >=7235759084a4f8524a46bd2638885ff3b34ce279 <25a0758cf6bdbfddac2be71124c9bd0692f4b0b1 || >=7235759084a4f8524a46bd2638885ff3b34ce279 <b799f67119aff179719a0b1e12441ebbdaaf62f9 || >=7235759084a4f8524a46bd2638885ff3b34ce279 <390f6bd8583d177029d9df4bea6667509e55a765 | 33ce55b368b64d65941867add00e7f288cbb8234, 63b39e49a4c9d68e010e96b26fc7374f0864f2b1, 25a0758cf6bdbfddac2be71124c9bd0692f4b0b1, b799f67119aff179719a0b1e12441ebbdaaf62f9, 390f6bd8583d177029d9df4bea6667509e55a765 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
In the Linux kernel, the following vulnerability has been resolved: tracing/user_events: Clear copied tracing state before fork duplication dup_task_struct() copies user_event_mm from the parent into the child, without grabbing a reference to it. user_event_mm_dup() should replace it, but it leaves that copied pointer unmodified if user_event_mm_alloc() fails. When the child exits, user_event_mm_remove() decrements a reference the child never owned, which ultimately frees user_event_mm, while the parent still as a stale pointer to it. This creates a UAF, which KASAN reports as: BUG: KASAN: slab-use-after-free in current_user_event_mm+0x51/0x1d0 Write of size 4 at addr ffff888005010d30 by task init/44 Call Trace: <TASK> kasan_report+0xce/0x100 kasan_check_range+0x10f/0x1e0 current_user_event_mm+0x51/0x1d0 user_events_ioctl+0x82e/0x15c0 __x64_sys_ioctl+0x139/0x1c0 do_syscall_64+0xce/0x450 entry_SYSCALL_64_after_hwframe+0x77/0x7f Allocated by task 44: __kasan_kmalloc+0x8f/0xa0 __kmalloc_cache_noprof+0x180/0x3a0 user_event_mm_alloc+0x3c/0x1f0 current_user_event_mm+0x88/0x1d0 Freed by task 42: __kasan_slab_free+0x43/0x70 kfree+0x13a/0x390 process_one_work+0x696/0xf90 worker_thread+0x420/0xba0 The fix simply clears the copied pointer before any possible failure. In case of failure, the child then has nothing to free.
Quoted source text, attributed separately from HOL analysis.