Description (CNA)
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
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected a31caf5779ace8fa98b0d454133808e082ee7a1b before d616876256b38ecf9a1a1c7d674192c5346bc69c; affected fe9b9e621cebe6b7e83f7e954c70f8bb430520e5 before e07a9c2a850cdebf625e7a1b8171bd23a8554313; affected 7de16d75b20ab13b75a7291f449a1b00090edfea before 5391f9db2cab5ef1cb411be1ab7dbec728078fba; affected d2d3ab1b1de3302de2c85769121fd4f890e47ceb before 280cf1173726a7059b628c610c71050d5c0b6937; affected 51e394c6f81adbfe7c34d15f58b3d4d44f144acf before a02fd5d775cf9787ee7698c797e20f2fa13d2e2b; affected 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9 before b6ebe4fed73eedeb73f4540f8edc4871945474c8; affected 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9 before d377f5a28332954b19e373d36823e59830ab1712; affected 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9 before 0b9130247f3b6a1122478471ff0e014ea96bb735; affected e666990abb2e42dd4ba979b4706280a3664cfae7; affected 4.19.272 before 4.19.317; affected 5.4.231 before 5.4.279; affected 5.10.166 before 5.10.221; affected 5.15.91 before 5.15.162; affected 6.1.9 before 6.1.96; affected 4.14.305 before 4.15 |
| Linux / Linux | affected 6.2; unaffected 0 before 6.2; unaffected 4.19.317 through 4.19.*; unaffected 5.4.279 through 5.4.*; unaffected 5.10.221 through 5.10.*; unaffected 5.15.162 through 5.15.*; unaffected 6.1.96 through 6.1.*; unaffected 6.6.36 through 6.6.*; unaffected 6.9.7 through 6.9.*; unaffected 6.10 through * |
CWE
No CWE identifiers supplied.
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
ADP enrichment
No English description supplied.
- 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
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
No English description supplied.
No references supplied.
No English description supplied.