CVE-2024-41006

MEDIUM
Published Jul 12, 2024 Modified May 12, 2026 CWE-401

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

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-401 CWE-401

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/0b9130247f3b6a1122478471ff0e014ea96bb735 https://git.kernel.org/stable/c/280cf1173726a7059b628c610c71050d5c0b6937 https://git.kernel.org/stable/c/5391f9db2cab5ef1cb411be1ab7dbec728078fba 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/d616876256b38ecf9a1a1c7d674192c5346bc69c https://git.kernel.org/stable/c/e07a9c2a850cdebf625e7a1b8171bd23a8554313 https://git.kernel.org/stable/c/0b9130247f3b6a1122478471ff0e014ea96bb735 https://git.kernel.org/stable/c/280cf1173726a7059b628c610c71050d5c0b6937 https://git.kernel.org/stable/c/5391f9db2cab5ef1cb411be1ab7dbec728078fba 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/d616876256b38ecf9a1a1c7d674192c5346bc69c https://git.kernel.org/stable/c/e07a9c2a850cdebf625e7a1b8171bd23a8554313

Frequently Asked Questions

What is CVE-2024-41006? +
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 It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-41006? +
CVE-2024-41006 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-41006? +
CVE-2024-41006 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-41006? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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