CVE-2026-99072None▾ SunlitIn 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-o…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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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.
Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < 72d9d17092bb37b0717f12042a0817d01a1f9e78Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88Linux >= 680aea08e78c003292415518ad270bc20f9c80b1 < d3daa33c7af92e38f2274bbd2576f58bfbaf89e6Linux 5.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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