Answer in brief
CVE-2026-99072 records a Unknown severity vulnerability in ipv4: stop route notification sizing when nexthop group shrinks. The current sources do not mark it as known exploited. The current feed maps 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.
A CVSS score is not reported in the current record. 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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=680aea08e78c003292415518ad270bc20f9c80b1 <72d9d17092bb37b0717f12042a0817d01a1f9e78 || >=680aea08e78c003292415518ad270bc20f9c80b1 <ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54 || >=680aea08e78c003292415518ad270bc20f9c80b1 <c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49 || >=680aea08e78c003292415518ad270bc20f9c80b1 <ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88 || >=680aea08e78c003292415518ad270bc20f9c80b1 <d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 | 72d9d17092bb37b0717f12042a0817d01a1f9e78, ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54, c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49, ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88, d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 |
| Linux/Linuxgeneric | 5.12 | Not reported |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
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.
Quoted source text, attributed separately from HOL analysis.