CVE-2026-89643
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, audit_del_rule() has a use-after-free on fsnotify rule autoremove. The unconditional audit_put_tree() assumes the template case, so for mixed AUDIT_DIR and AUDIT_EXE rules an autoremove event drops the installed rule's live tree reference. Repeating this can free the tree while another rule still references it, leading to dereferencing a freed pathname. The fix moves the temporary tree put to audit_rule_change().
Risk Assessment
A use-after-free in the kernel audit subsystem can lead to system crash, privilege escalation, or arbitrary code execution in kernel context. It requires local access and configured audit rules.
Recommendation
Update the Linux kernel to a version containing this fix. Restrict the ability to configure audit rules to trusted users.
Other vulnerabilities in Linux kernel
See all- CVE-2026-80923Unknown
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- CVE-2026-80920Unknown
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- CVE-2026-80918Unknown
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- CVE-2026-80917Unknown
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- CVE-2026-80916Unknown
A vulnerability in the Linux kernel's KCOV mechanism causes data corruption and race conditions on PREEMPT_RT systems. The issue stems from storing temporary KCOV state in per-CPU areas, which can be overwritten by nested softirq preemption. Additionally, under certain initialization conditions, it may lead to kernel panic or memory leaks.
- CVE-2026-80915Unknown
In the Linux kernel, the drm/xe driver's DPT allocation paths were fixed. The fallback from VRAM to system memory was removed as it did not work and caused black screen with pipe faults. Also, stolen memory usage is avoided due to latency and risk of random system hangs under load.
- CVE-2026-80886Unknown
In the Linux kernel, a vulnerability in the msm serial driver was fixed by disabling DMA for the console UART. Concurrent writes from userspace and the kernel can trigger a race condition resulting in an infinite loop of the same messages. The fix disables DMA for the console UART to ensure a reliable output path.
- CVE-2026-80885Unknown
In the Linux kernel, a fix was made for an uncancelled rxrpc OOB message handler in AFS. The fix cancels OOB message processing (typically to respond to security challenges) and moves it to afs_wq so it is also waited for. The OOB handler now returns if the net namespace is no longer live.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: audit: avoid dropping live tree ref on fsnotify rule autoremove audit_del_rule() is used for both netlink deletion templates and internal fsnotify autoremove. The former passes a parsed template which owns a temporary tree reference; the latter passes the installed entry itself. The unconditional audit_put_tree() at the end of audit_del_rule() assumes the template case. For mixed AUDIT_DIR plus AUDIT_EXE rules, an fsnotify autoremove event therefore drops the installed rule's live tree reference. Repeating this across rules sharing the same tree can free the tree while another rule still references it, and a later autoremove dereferences the freed pathname while comparing rules. Move the temporary-tree put to audit_rule_change(), the caller that owns deletion templates. Keep it in the AUDIT_DEL_RULE cleanup so both successful deletion and -ENOENT still release the parser-owned tree. [PM: dropped unnecessary comment for line length reasons]