cve/published/2022/CVE-2022-49889.json

{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Check for NULL cpu_buffer in ring_buffer_wake_waiters()\n\nOn some machines the number of listed CPUs may be bigger than the actual\nCPUs that exist. The tracing subsystem allocates a per_cpu directory with\naccess to the per CPU ring buffer via a cpuX file. But to save space, the\nring buffer will only allocate buffers for online CPUs, even though the\nCPU array will be as big as the nr_cpu_ids.\n\nWith the addition of waking waiters on the ring buffer when closing the\nfile, the ring_buffer_wake_waiters() now needs to make sure that the\nbuffer is allocated (with the irq_work allocated with it) before trying to\nwake waiters, as it will cause a NULL pointer dereference.\n\nWhile debugging this, I added a NULL check for the buffer itself (which is\nOK to do), and also NULL pointer checks against buffer->buffers (which is\nnot fine, and will WARN) as well as making sure the CPU number passed in\nis within the nr_cpu_ids (which is also not fine if it isn't).\n\n\nBugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=1204705"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "kernel/trace/ring_buffer.c"
               ],
               "versions": [
                  {
                     "version": "2475de2bc0de17fb1b24c5e90194f84b5ca70d3e",
                     "lessThan": "b5074df412bf3df9d6ce096b6fa03eb1082d05c9",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f4f15344110d0b5b8822ac97bc8200e71939c945",
                     "lessThan": "49ca992f6e50d0f46ec9608f44e011cf3121f389",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "f3ddb74ad0790030c9592229fb14d8c451f4e9a8",
                     "lessThan": "7433632c9ff68a991bd0bc38cabf354e9d2de410",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "5544f411a4e8bc39e6a444badbac37dd0e0caf0a",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "kernel/trace/ring_buffer.c"
               ],
               "versions": [
                  {
                     "version": "5.15.75",
                     "lessThan": "5.15.78",
                     "status": "affected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.0.3",
                     "lessThan": "6.0.8",
                     "status": "affected",
                     "versionType": "semver"
                  }
               ]
            }
         ],
         "cpeApplicability": [
            {
               "nodes": [
                  {
                     "operator": "OR",
                     "negate": false,
                     "cpeMatch": [
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.15.75",
                           "versionEndExcluding": "5.15.78"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "6.0.3",
                           "versionEndExcluding": "6.0.8"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.19.17"
                        }
                     ]
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/b5074df412bf3df9d6ce096b6fa03eb1082d05c9"
            },
            {
               "url": "https://git.kernel.org/stable/c/49ca992f6e50d0f46ec9608f44e011cf3121f389"
            },
            {
               "url": "https://git.kernel.org/stable/c/7433632c9ff68a991bd0bc38cabf354e9d2de410"
            }
         ],
         "title": "ring-buffer: Check for NULL cpu_buffer in ring_buffer_wake_waiters()",
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            "engine": "bippy-1.2.0"
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      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-49889",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}