cve-2024-41006
Vulnerability from cvelistv5
Published
2024-07-12 12:44
Modified
2024-12-19 09:09
Severity ?
Summary
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
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b9130247f3b6a1122478471ff0e014ea96bb735Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/280cf1173726a7059b628c610c71050d5c0b6937Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5391f9db2cab5ef1cb411be1ab7dbec728078fbaMailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a02fd5d775cf9787ee7698c797e20f2fa13d2e2bMailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6ebe4fed73eedeb73f4540f8edc4871945474c8Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d377f5a28332954b19e373d36823e59830ab1712Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d616876256b38ecf9a1a1c7d674192c5346bc69cMailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e07a9c2a850cdebf625e7a1b8171bd23a8554313Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0b9130247f3b6a1122478471ff0e014ea96bb735Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/280cf1173726a7059b628c610c71050d5c0b6937Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5391f9db2cab5ef1cb411be1ab7dbec728078fbaMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a02fd5d775cf9787ee7698c797e20f2fa13d2e2bMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b6ebe4fed73eedeb73f4540f8edc4871945474c8Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d377f5a28332954b19e373d36823e59830ab1712Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d616876256b38ecf9a1a1c7d674192c5346bc69cMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e07a9c2a850cdebf625e7a1b8171bd23a8554313Mailing List, Patch
Impacted products
Vendor Product Version
Linux Linux Version: a31caf5779ace8fa98b0d454133808e082ee7a1b
Version: fe9b9e621cebe6b7e83f7e954c70f8bb430520e5
Version: 7de16d75b20ab13b75a7291f449a1b00090edfea
Version: d2d3ab1b1de3302de2c85769121fd4f890e47ceb
Version: 51e394c6f81adbfe7c34d15f58b3d4d44f144acf
Version: 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9
Version: 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9
Version: 409db27e3a2eb5e8ef7226ca33be33361b3ed1c9
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   Linux Linux Version: 6.2
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      nvd: "{\"cve\":{\"id\":\"CVE-2024-41006\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-12T13:15:21.370\",\"lastModified\":\"2024-11-21T09:32:03.057\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetrom: Fix a memory leak in nr_heartbeat_expiry()\\n\\nsyzbot reported a memory leak in nr_create() [0].\\n\\nCommit 409db27e3a2e (\\\"netrom: Fix use-after-free of a listening socket.\\\")\\nadded sock_hold() to the nr_heartbeat_expiry() function, where\\na) a socket has a SOCK_DESTROY flag or\\nb) a listening socket has a SOCK_DEAD flag.\\n\\nBut in the case \\\"a,\\\" when the SOCK_DESTROY flag is set, the file descriptor\\nhas already been closed and the nr_release() function has been called.\\nSo it makes no sense to hold the reference count because no one will\\ncall another nr_destroy_socket() and put it as in the case \\\"b.\\\"\\n\\nnr_connect\\n  nr_establish_data_link\\n    nr_start_heartbeat\\n\\nnr_release\\n  switch (nr->state)\\n  case NR_STATE_3\\n    nr->state = NR_STATE_2\\n    sock_set_flag(sk, SOCK_DESTROY);\\n\\n                        nr_rx_frame\\n                          nr_process_rx_frame\\n                            switch (nr->state)\\n                            case NR_STATE_2\\n                              nr_state2_machine()\\n                                nr_disconnect()\\n                                  nr_sk(sk)->state = NR_STATE_0\\n                                  sock_set_flag(sk, SOCK_DEAD)\\n\\n                        nr_heartbeat_expiry\\n                          switch (nr->state)\\n                          case NR_STATE_0\\n                            if (sock_flag(sk, SOCK_DESTROY) ||\\n                               (sk->sk_state == TCP_LISTEN\\n                                 && sock_flag(sk, SOCK_DEAD)))\\n                               sock_hold()  // ( !!! )\\n                               nr_destroy_socket()\\n\\nTo fix the memory leak, let's call sock_hold() only for a listening socket.\\n\\nFound by InfoTeCS on behalf of Linux Verification Center\\n(linuxtesting.org) with Syzkaller.\\n\\n[0]: https://syzkaller.appspot.com/bug?extid=d327a1f3b12e1e206c16\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netrom: corrige una pérdida de memoria en nr_heartbeat_expiry() syzbot informó una pérdida de memoria en nr_create() [0]. El commit 409db27e3a2e (\\\"netrom: Reparar el use-after-free de un socket de escucha\\\") agregó sock_hold() a la función nr_heartbeat_expiry(), donde a) un socket tiene un indicador SOCK_DESTROY ob) un socket de escucha tiene un indicador SOCK_DEAD. Pero en el caso \\\"a\\\", cuando se establece el indicador SOCK_DESTROY, el descriptor de archivo ya se ha cerrado y se ha llamado a la función nr_release(). Por lo tanto, no tiene sentido mantener el recuento de referencias porque nadie llamará a otro nr_destroy_socket() y lo pondrá como en el caso \\\"b\\\". nr_connect nr_establecer_data_link nr_start_heartbeat nr_release interruptor (nr->estado) caso NR_STATE_3 nr->estado = NR_STATE_2 sock_set_flag(sk, SOCK_DESTROY); nr_rx_frame nr_process_rx_frame interruptor (nr->estado) caso NR_STATE_2 nr_state2_machine() nr_disconnect() nr_sk(sk)->estado = NR_STATE_0 sock_set_flag(sk, SOCK_DEAD) nr_heartbeat_expiry interruptor (nr->estado) caso NR_STATE_0 if (sock_flag(sk, OCK_DESTROY) || (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) sock_hold() // ( !!! ) nr_destroy_socket() Para solucionar la pérdida de memoria, llamemos a sock_hold() solo para un socket de escucha. Encontrado por InfoTeCS en nombre del Centro de verificación de Linux (linuxtesting.org) con Syzkaller. 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// ( !!! )\\n                               nr_destroy_socket()\\n\\nTo fix the memory leak, let's call sock_hold() only for a listening socket.\\n\\nFound by InfoTeCS on behalf of Linux Verification Center\\n(linuxtesting.org) with Syzkaller.\\n\\n[0]: https://syzkaller.appspot.com/bug?extid=d327a1f3b12e1e206c16\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:34:54.773Z\"}}}",
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}


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