CVE-2022-49728: ipv6: Fix signed integer overflow in __ip6_append_data
In the Linux kernel, the following vulnerability has been resolved:
ipv6: Fix signed integer overflow in ip6appenddata
Resurrect ubsan overflow checks and ubsan report this warning, fix it by change the variable [length] type to sizet.
UBSAN: signed-integer-overflow in net/ipv6/ip6output.c:1489:19 2147479552 + 8567 cannot be represented in type 'int' CPU: 0 PID: 253 Comm: err Not tainted 5.16.0+ #1 Hardware name: linux,dummy-virt (DT) Call trace: dumpbacktrace+0x214/0x230 showstack+0x30/0x78 dumpstacklvl+0xf8/0x118 dumpstack+0x18/0x30 ubsanepilogue+0x18/0x60 handleoverflow+0xd0/0xf0 ubsanhandleaddoverflow+0x34/0x44 ip6appenddata.isra.48+0x1598/0x1688 ip6appenddata+0x128/0x260 udpv6sendmsg+0x680/0xdd0 inet6sendmsg+0x54/0x90 socksendmsg+0x70/0x88 syssendmsg+0xe8/0x368 syssendmsg+0x98/0xe0 syssendmmsg+0xf4/0x3b8 arm64syssendmmsg+0x34/0x48 invokesyscall+0x64/0x160 el0svccommon.constprop.4+0x124/0x300 doel0svc+0x44/0xc8 el0svc+0x3c/0x1e8 el0t64synchandler+0x88/0xb0 el0t64sync+0x16c/0x170
Changes since v1: -Change the variable [length] type to unsigned, as Eric Dumazet suggested. Changes since v2: -Don't change exthdrlen type in ip6makeskb, as Paolo Abeni suggested. Changes since v3: -Don't change ulen type in udpv6sendmsg and l2tpip6sendmsg, as Jakub Kicinski suggested.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 5.15.180.1-1 - Configuration
Fix the signed-integer-overflow in __ip6_append_data (net/ipv6/ip6_output.c:1489:19) by changing the variable [length] type to size_t (per 'fix it by change the variable [length] type to size_t').
Linux kernel net/ipv6/ip6_output.c (__ip6_append_data) [length] variable type = size_t - Configuration
Do not change exthdrlen type in ip6_make_skb (as suggested by Paolo Abeni).
Linux kernel net/ipv6/ip6_output.c (ip6_make_skb) exthdrlen variable type change = do not change - Configuration
Do not change ulen type in udpv6_sendmsg and l2tp_ip6_sendmsg because 2147479552 + 8567 cannot be represented in type 'int' (as stated in the material).
Linux kernel net/ipv6 (udpv6_sendmsg and l2tp_ip6_sendmsg) ulen variable type change = do not change
Event History
Frequently Asked Questions
What is the severity of CVE-2022-49728?
CVE-2022-49728 has been rated as a moderate severity vulnerability due to its potential for causing signed integer overflow in the Linux kernel.
How do I fix CVE-2022-49728?
To fix CVE-2022-49728, upgrade to a patched version of the Linux kernel, specifically versions beyond 5.16.0.
What systems are affected by CVE-2022-49728?
CVE-2022-49728 affects Linux Kernel versions starting from 5.16.0.
What is the impact of CVE-2022-49728?
The impact of CVE-2022-49728 includes the risk of an attacker exploiting signed integer overflow which may lead to system instability or potential security breaches.
What does CVE-2022-49728 actually involve?
CVE-2022-49728 involves a signed integer overflow vulnerability in the IPv6 subsystem of the Linux kernel.