| From bippy-7c5fe7eed585 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49728: ipv6: Fix signed integer overflow in __ip6_append_data |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ipv6: Fix signed integer overflow in __ip6_append_data |
| |
| Resurrect ubsan overflow checks and ubsan report this warning, |
| fix it by change the variable [length] type to size_t. |
| |
| UBSAN: signed-integer-overflow in net/ipv6/ip6_output.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: |
| dump_backtrace+0x214/0x230 |
| show_stack+0x30/0x78 |
| dump_stack_lvl+0xf8/0x118 |
| dump_stack+0x18/0x30 |
| ubsan_epilogue+0x18/0x60 |
| handle_overflow+0xd0/0xf0 |
| __ubsan_handle_add_overflow+0x34/0x44 |
| __ip6_append_data.isra.48+0x1598/0x1688 |
| ip6_append_data+0x128/0x260 |
| udpv6_sendmsg+0x680/0xdd0 |
| inet6_sendmsg+0x54/0x90 |
| sock_sendmsg+0x70/0x88 |
| ____sys_sendmsg+0xe8/0x368 |
| ___sys_sendmsg+0x98/0xe0 |
| __sys_sendmmsg+0xf4/0x3b8 |
| __arm64_sys_sendmmsg+0x34/0x48 |
| invoke_syscall+0x64/0x160 |
| el0_svc_common.constprop.4+0x124/0x300 |
| do_el0_svc+0x44/0xc8 |
| el0_svc+0x3c/0x1e8 |
| el0t_64_sync_handler+0x88/0xb0 |
| el0t_64_sync+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 ip6_make_skb, as Paolo Abeni suggested. |
| Changes since v3: |
| -Don't change ulen type in udpv6_sendmsg and l2tp_ip6_sendmsg, as |
| Jakub Kicinski suggested. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49728 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.10.236 with commit f26422eabeb517629568edf8c2dd9c6cb9147584 |
| Fixed in 5.15.180 with commit 70549c80fe80ac4e2a22068c76ebebced24f7e74 |
| Fixed in 5.18.6 with commit 84dc940890e91e42898e4443a093281702440abf |
| Fixed in 5.19 with commit f93431c86b631bbca5614c66f966bf3ddb3c2803 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49728 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| include/net/ipv6.h |
| net/ipv6/ip6_output.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/f26422eabeb517629568edf8c2dd9c6cb9147584 |
| https://git.kernel.org/stable/c/70549c80fe80ac4e2a22068c76ebebced24f7e74 |
| https://git.kernel.org/stable/c/84dc940890e91e42898e4443a093281702440abf |
| https://git.kernel.org/stable/c/f93431c86b631bbca5614c66f966bf3ddb3c2803 |
