CVE-2026-89988 Affecting kernel-tools-devel package, versions <1:6.1.188-233.385.amzn2023
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-AMZN2023-KERNELTOOLSDEVEL-20871369
- published13 Oct 2026
- disclosed16 Sept 2026
Introduced: 16 Sep 2026
NewCVE-2026-89988 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel-tools-devel to version 1:6.1.188-233.385.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3197.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools-devel package and not the kernel-tools-devel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
kprobes: Protect kprobe_blacklist with RCU
__within_kprobe_blacklist() traverses kprobe_blacklist without holding kprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist() removes blacklist entries and immediately frees them with kfree(). A concurrent call to within_kprobe_blacklist() can therefore dereference freed memory.
Furthermore, within_kprobe_blacklist() can be called in atomic or non-preemptible contexts where the sleeping kprobe_mutex cannot be taken.
Protect kprobe_blacklist with RCU. Use guard(rcu)() and list_for_each_entry_rcu() for traversal, list_add_tail_rcu() for insertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim entries safely after a grace period.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-89988
- https://git.kernel.org/stable/c/0c4256196b3a105307e2235fbfd85e768bbcdd0f
- https://git.kernel.org/stable/c/518d9b5568bb06f86e4434f7a30faa9612ea91ad
- https://git.kernel.org/stable/c/5da247e4d1e8661d4d6f997101d59967e8994e32
- https://git.kernel.org/stable/c/630ed8734a02b992e8a97538179c2ece42c5210f
- https://git.kernel.org/stable/c/6e62cf983a2bd547e6bbd3f935539233e5f97f8f
- https://git.kernel.org/stable/c/8f406205003f741225f620f0e357ca0de71d45e3