What’s Vulnerable › Vulnerabilities

CVE-2022-49862: tipc: fix the msg->req tlv len check in tipc_nl_compat_name_table_dump_header

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-01 · updated 2026-06-17
• Weakness: CWE-908

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]

Affected products

• Linux kernel: from 4.4.172 before 4.5; from 4.9.152 before 4.9.334; from 4.14.95 before 4.14.300; from 4.19.17 before 4.19.267; from 4.20.4 before 5.4.225; from 5.5 before 5.10.155 — fixed in 4.14.300, 4.19.267, 4.5, 4.9.334, 5.10.155, 5.15.79

How to fix

Upgrade to a fixed version: Linux kernel 4.14.300, 4.19.267, 4.5, 4.9.334. Check the vendor advisory for mitigations.

References

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

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