{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: fix possible null-ptr-defer in spk_ttyio_release\n\nRun the following tests on the qemu platform:\n\nsyzkaller:~# modprobe speakup_audptr\n input: Speakup as /devices/virtual/input/input4\n initialized device: /dev/synth, node (MAJOR 10, MINOR 125)\n speakup 3.1.6: initialized\n synth name on entry is: (null)\n synth probe\n\nspk_ttyio_initialise_ldisc failed because tty_kopen_exclusive returned\nfailed (errno -16), then remove the module, we will get a null-ptr-defer\nproblem, as follow:\n\nsyzkaller:~# modprobe -r speakup_audptr\n releasing synth audptr\n BUG: kernel NULL pointer dereference, address: 0000000000000080\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#1] PREEMPT SMP PTI\n CPU: 2 PID: 204 Comm: modprobe Not tainted 6.1.0-rc6-dirty #1\n RIP: 0010:mutex_lock+0x14/0x30\n Call Trace:\n <TASK>\n  spk_ttyio_release+0x19/0x70 [speakup]\n  synth_release.part.6+0xac/0xc0 [speakup]\n  synth_remove+0x56/0x60 [speakup]\n  __x64_sys_delete_module+0x156/0x250\n  ? fpregs_assert_state_consistent+0x1d/0x50\n  do_syscall_64+0x37/0x90\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n </TASK>\n Modules linked in: speakup_audptr(-) speakup\n Dumping ftrace buffer:\n\nin_synth->dev was not initialized during modprobe, so we add check\nfor in_synth->dev to fix this bug."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/accessibility/speakup/spk_ttyio.c"
               ],
               "versions": [
                  {
                     "version": "4f2a81f3a882",
                     "lessThan": "2da67bff29ab",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "4f2a81f3a882",
                     "lessThan": "64152e05a4de",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "4f2a81f3a882",
                     "lessThan": "5abbeebd8296",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/accessibility/speakup/spk_ttyio.c"
               ],
               "versions": [
                  {
                     "version": "5.12",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.12",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.90",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.8",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.2",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/2da67bff29ab49caafb0766e8b8383b735ff796f"
            },
            {
               "url": "https://git.kernel.org/stable/c/64152e05a4de3ebf59f1740a0985a6d5fba0c77b"
            },
            {
               "url": "https://git.kernel.org/stable/c/5abbeebd8296c2301023b8dc4b5a6c0d5229b4f5"
            }
         ],
         "title": "tty: fix possible null-ptr-defer in spk_ttyio_release",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-48870",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}