Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: Fix fib_nlmsg_size() for RTA_VIA nexthops fib_nlmsg_size() still estimates nexthop space as if every gateway is encoded as an IPv4 RTA_GATEWAY attribute. IPv4 routes can also carry an IPv6 gateway, which fib_nexthop_info() dumps as RTA_VIA. As a result, route notifications can allocate an skb that is too small. fib_dump_info() then fails with -EMSGSIZE and rtmsg_fib() hits the WARN_ON() that marks such failures as a fib_nlmsg_size() bug. With panic_on_warn set, this becomes a kernel panic. Mirror the actual nexthop dump layout in fib_nlmsg_size(): account for IPv6 nexthop gateways dumped as RTA_VIA, for the no-header rtnexthop layout used inside RTA_MULTIPATH, and for RTA_FLOW only when it is actually present.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d15662682db232da77136cd348f4c9df312ca6f9 to < 57195f0ab5cfbb5ee0864e5aff15ceb48f5a5e28affectedd15662682db232da77136cd348f4c9df312ca6f9 to < 0f0ca602941d0a81ae9514943ca06c55159c6385affectedd15662682db232da77136cd348f4c9df312ca6f9 to < 5307a53599fa762c06e475ee4a375252074fd324affectedd15662682db232da77136cd348f4c9df312ca6f9 to < 7f80ad373ce4a7af5367ff273cea0f16e91387f3affectedd15662682db232da77136cd348f4c9df312ca6f9 to < 4a5dfbae5179f6574695012a980476254df2d295affectedd15662682db232da77136cd348f4c9df312ca6f9 to < a59edda6eda1252340354322d8ab318b2e9052fbaffectedd15662682db232da77136cd348f4c9df312ca6f9 to < 9b22f13524fa0de0d963bbd3002df6c28bae3395affectedd15662682db232da77136cd348f4c9df312ca6f9 to < 4ff9548d84945d2cbf9e4c207288063a200ea397affected
Linux Linux
Default version status: affected
5.2affected0 to < 5.2unaffected5.10.267 to ≤ 5.10.*unaffected5.15.216 to ≤ 5.15.*unaffected6.1.183 to ≤ 6.1.*unaffected6.6.152 to ≤ 6.6.*unaffected6.12.104 to ≤ 6.12.*unaffected6.18.45 to ≤ 6.18.*unaffected7.1.9 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/57195f0ab5cfbb5ee0864e5aff15ceb48f5a5e28 ↗
- https://git.kernel.org/stable/c/0f0ca602941d0a81ae9514943ca06c55159c6385 ↗
- https://git.kernel.org/stable/c/5307a53599fa762c06e475ee4a375252074fd324 ↗
- https://git.kernel.org/stable/c/7f80ad373ce4a7af5367ff273cea0f16e91387f3 ↗
- https://git.kernel.org/stable/c/4a5dfbae5179f6574695012a980476254df2d295 ↗
- https://git.kernel.org/stable/c/a59edda6eda1252340354322d8ab318b2e9052fb ↗
- https://git.kernel.org/stable/c/9b22f13524fa0de0d963bbd3002df6c28bae3395 ↗
- https://git.kernel.org/stable/c/4ff9548d84945d2cbf9e4c207288063a200ea397 ↗