Common vulnerabilities and Exposures (CVE)

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Required CVE Record Information

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix listen() setting the bar too high for the prealloc rings AF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump up the sysctl), but whilst the preallocation circular buffers have 32 slots in them, one of them has to be a dead slot because we're using CIRC_CNT(). This means that listen(rxrpc_sock, 32) will cause an oops when the socket is closed because rxrpc_service_prealloc_one() allocated one too many calls and rxrpc_discard_prealloc() won't then be able to get rid of them because it'll think the ring is empty. rxrpc_release_calls_on_socket() then tries to abort them, but oopses because call->peer isn't yet set. Fix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match the ring capacity. BUG: kernel NULL pointer dereference, address: 0000000000000086 ... RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc] Call Trace: <TASK> ? __wake_up_common_lock+0x7a/0x90 ? rxrpc_notify_socket+0x8e/0x140 [rxrpc] ? rxrpc_abort_call+0x4c/0x60 [rxrpc] rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc] rxrpc_release+0xc9/0x1c0 [rxrpc] __sock_release+0x37/0xa0 sock_close+0x11/0x20 __fput+0x89/0x240 task_work_run+0x59/0x90 do_exit+0x319/0xaa0

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Versions 9 Total

Default Status: unaffected

affected

  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 61fb38cfbb1d54d3dafd0c25752f684b3cd00b32 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 616f76498d5ddf26b997caf64a95cda3c8a55533 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 4a3a78b7918bdd723d8c7c9786522ca969bffcc4 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 91b34bf0409f43bb60453bab23c5beadd726d022 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 5b4826657d36c218e9f08e8d3223b0edce3de88f 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before b3a9b227d5e7467b8518160ff034ea22bb9de573 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 369de57492c4f1a42563c5a3bd365822ca3bfc79 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before e198f1930050e3115c80b67d9249f80f98a27c67 
  • affected from 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 before 88e22159750b0d55793302eeed8ee603f5c1a95c 

Versions 11 Total

Default Status: affected

affected

  • affected at 4.9 

unaffected

  • unaffected from 0 before 4.9 
  • unaffected from 4.9.318 through 4.9.* 
  • unaffected from 4.14.283 through 4.14.* 
  • unaffected from 4.19.247 through 4.19.* 
  • unaffected from 5.4.198 through 5.4.* 
  • unaffected from 5.10.121 through 5.10.* 
  • unaffected from 5.15.46 through 5.15.* 
  • unaffected from 5.17.14 through 5.17.* 
  • unaffected from 5.18.3 through 5.18.* 
  • unaffected from 5.19