# CVE-2022-49728: linux: In the Linux kernel, the following vulnerability has been resolved:  ipv6: Fix signed integer overflow in __ip6_appen...

CVE-2022-49728 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49728, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49728
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.14-1 | [DEBIAN-CVE-2022-49728](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49728.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.14-1 | [DEBIAN-CVE-2022-49728](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49728.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.14-1 | [DEBIAN-CVE-2022-49728](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49728.md) | Feb 26, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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