CVE-2026-99072 Affecting kernel-livepatch-6.12.113-138.209 package, versions <1:1.0-0.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-KERNELLIVEPATCH612113138209-21811146
- published29 Oct 2026
- disclosed23 Oct 2026
Introduced: 23 Oct 2026
NewCVE-2026-99072 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel-livepatch-6.12.113-138.209 to version 1:1.0-0.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3335.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-6.12.113-138.209 package and not the kernel-livepatch-6.12.113-138.209 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:
ipv4: stop route notification sizing when nexthop group shrinks
Commit 680aea08e78c ("net: ipv4: Emit notification when fib hardware flags are changed") added an RCU-only fib_nlmsg_size() call for asynchronous hardware flag notifications.
fib_nlmsg_size() checks fib_info_num_path() before each iteration, then fib_info_nhc() independently reloads nh->nh_grp. If RTM_NEWNEXTHOP replaces a group with fewer paths between those loads, fib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences it.
Stop sizing when the indexed path is absent. Nexthop groups are dense, so the current snapshot has no later path.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-99072
- https://git.kernel.org/stable/c/72d9d17092bb37b0717f12042a0817d01a1f9e78
- https://git.kernel.org/stable/c/ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54
- https://git.kernel.org/stable/c/ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88
- https://git.kernel.org/stable/c/c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49
- https://git.kernel.org/stable/c/d3daa33c7af92e38f2274bbd2576f58bfbaf89e6