CVE-2026-99072
ipv4: stop route notification sizing when nexthop group shrinks
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Description
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.
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < 72d9d17092bb37b0717f12042a0817d01a1f9e78 affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54 affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49 affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88 affected: 680aea08e78c003292415518ad270bc20f9c80b1 … < d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 default: unaffected |
| Linux | Linux | affected: 5.12 unaffected: 0 … < 5.12 unaffected: 6.6.160 … <= 6.6.* unaffected: 6.12.113 … <= 6.12.* unaffected: 6.18.57 … <= 6.18.* unaffected: 7.2.11 … <= 7.2.* unaffected: 7.3 … <= * default: affected |
Open-source packages (GitHub Advisory / OSV)
ipv4: stop route notification sizing when nexthop group shrinks
| Ecosystem | Package | Affected versions | Fixed in |
|---|---|---|---|
| >= 680aea08e78c003292415518ad270bc20f9c80b1, < 72d9d17092bb37b0717f12042a0817d01a1f9e78; < ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54; < c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49; < ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88; < d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 | 72d9d17092bb37b0717f12042a0817d01a1f9e78, ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54, c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49, ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88, d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 | ||
| Linux | Kernel | >= 5.12.0, < 6.6.160; >= 6.7.0, < 6.12.113; >= 6.13.0, < 6.18.57; >= 6.19.0, < 7.2.11 | 6.6.160, 6.12.113, 6.18.57, 7.2.11 |
Linux distribution status
References (8)
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git OSV
- https://git.kernel.org/stable/c/72d9d17092bb37b0717f12042a0817d01a1f9e78 NVD, CNA, OSV
- https://git.kernel.org/stable/c/ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54 NVD, CNA, OSV
- https://git.kernel.org/stable/c/ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88 NVD, CNA, OSV
- https://git.kernel.org/stable/c/c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49 NVD, CNA, OSV
- https://git.kernel.org/stable/c/d3daa33c7af92e38f2274bbd2576f58bfbaf89e6 NVD, CNA, OSV
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99072.json OSV
- https://nvd.nist.gov/vuln/detail/CVE-2026-99072 OSV