CVE-2024-41006: netrom: Fix a memory leak in nr_heartbeat_expiry()
First published: Fri Jul 12 2024(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=4.19.272<4.19.317 | |
| Linux Linux kernel | >=5.4.231<5.4.279 | |
| Linux Linux kernel | >=5.10.166<5.10.221 | |
| Linux Linux kernel | >=5.15.91<5.15.162 | |
| Linux Linux kernel | >=6.1.9<6.1.96 | |
| Linux Linux kernel | >=6.2<6.6.36 | |
| Linux Linux kernel | >=6.7<6.9.7 | |
| Linux Linux kernel | =6.10-rc1 | |
| Linux Linux kernel | =6.10-rc2 | |
| Linux Linux kernel | =6.10-rc3 | |
| Linux Linux kernel | =6.10-rc4 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- 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/linus/0b9130247f3b6a1122478471ff0e014ea96bb735
- https://security-tracker.debian.org/tracker/CVE-2024-41006
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-41006
- https://nvd.nist.gov/vuln/detail/CVE-2024-41006
- https://launchpad.net/bugs/cve/CVE-2024-41006
- https://ubuntu.com/security/CVE-2024-41006
- agent/title
- agent/type
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/severity
- agent/weakness
- agent/author
- agent/remedy
- agent/first-publish-date
- agent/references
- agent/tags
- collector/usn-cve
- source/Ubuntu
- agent/description
- collector/nvd-cve
- agent/event
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/trending
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/4.19.272
- version/linux linux kernel/5.4.231
- version/linux linux kernel/5.10.166
- version/linux linux kernel/5.15.91
- version/linux linux kernel/6.1.9
- version/linux linux kernel/6.2
- version/linux linux kernel/6.7
- version/linux linux kernel/6.10-rc1
- version/linux linux kernel/6.10-rc2
- version/linux linux kernel/6.10-rc3
- version/linux linux kernel/6.10-rc4
- package-manager/debian