CVE-2026-99072ipv4: stop route notification sizing when nexthop group shrinks
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 23, 2026
- First seen by InfoSec Signals
- Oct 23, 2026
Affected products
Linux Linux linux:linux (from the name) | 680aea08e78c003292415518ad270bc20f9c80b1 builds before 72d9d17092bb37b0717f12042a0817d01a1f9e78; from 680aea08e78c003292415518ad270bc20f9c80b1 before ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54; from 680aea08e78c003292415518ad270bc20f9c80b1 before c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49; from 680aea08e78c003292415518ad270bc20f9c80b1 before ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88; from 680aea08e78c003292415518ad270bc20f9c80b1 before d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 | CNA record |
References
- https://git.kernel.org/stable/c/72d9d17092bb37b0717f12042a0817d01a1f9e78
- https://git.kernel.org/stable/c/ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54
- https://git.kernel.org/stable/c/c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49
- https://git.kernel.org/stable/c/ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88
- https://git.kernel.org/stable/c/d3daa33c7af92e38f2274bbd2576f58bfbaf89e6
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.