cve/published/2024/CVE-2024-50048.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\nfbcon: Fix a NULL pointer dereference issue in fbcon_putcs\n\nsyzbot has found a NULL pointer dereference bug in fbcon.\nHere is the simplified C reproducer:\n\nstruct param {\n\tuint8_t type;\n\tstruct tiocl_selection ts;\n};\n\nint main()\n{\n\tstruct fb_con2fbmap con2fb;\n\tstruct param param;\n\n\tint fd = open(\"/dev/fb1\", 0, 0);\n\n\tcon2fb.console = 0x19;\n\tcon2fb.framebuffer = 0;\n\tioctl(fd, FBIOPUT_CON2FBMAP, &con2fb);\n\n\tparam.type = 2;\n\tparam.ts.xs = 0; param.ts.ys = 0;\n\tparam.ts.xe = 0; param.ts.ye = 0;\n\tparam.ts.sel_mode = 0;\n\n\tint fd1 = open(\"/dev/tty1\", O_RDWR, 0);\n\tioctl(fd1, TIOCLINUX, &param);\n\n\tcon2fb.console = 1;\n\tcon2fb.framebuffer = 0;\n\tioctl(fd, FBIOPUT_CON2FBMAP, &con2fb);\n\n\treturn 0;\n}\n\nAfter calling ioctl(fd1, TIOCLINUX, &param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb)\ncauses the kernel to follow a different execution path:\n\n set_con2fb_map\n  -> con2fb_init_display\n   -> fbcon_set_disp\n    -> redraw_screen\n     -> hide_cursor\n      -> clear_selection\n       -> highlight\n        -> invert_screen\n         -> do_update_region\n          -> fbcon_putcs\n           -> ops->putcs\n\nSince ops->putcs is a NULL pointer, this leads to a kernel panic.\nTo prevent this, we need to call set_blitting_type() within set_con2fb_map()\nto properly initialize ops->putcs."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/video/fbdev/core/fbcon.c"
               ],
               "versions": [
                  {
                     "version": "b07db39584856e16814e2f065380e533a001535d",
                     "lessThan": "8266ae6eafdcd5a3136592445ff4038bbc7ee80e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "b07db39584856e16814e2f065380e533a001535d",
                     "lessThan": "f7fb5dda555344529ce584ff7a28b109528d2f1b",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "b07db39584856e16814e2f065380e533a001535d",
                     "lessThan": "e5c2dba62996a3a6eeb34bd248b90fc69c5a6a1b",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "b07db39584856e16814e2f065380e533a001535d",
                     "lessThan": "5b97eebcce1b4f3f07a71f635d6aa3af96c236e7",
                     "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/video/fbdev/core/fbcon.c"
               ],
               "versions": [
                  {
                     "version": "5.19",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.19",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.1.113",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.6.57",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.11.4",
                     "lessThanOrEqual": "6.11.*",
                     "status": "unaffected",
                     "versionType": "semver"
                  },
                  {
                     "version": "6.12",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "cpeApplicability": [
            {
               "nodes": [
                  {
                     "operator": "OR",
                     "negate": false,
                     "cpeMatch": [
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.19",
                           "versionEndExcluding": "6.1.113"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.19",
                           "versionEndExcluding": "6.6.57"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.19",
                           "versionEndExcluding": "6.11.4"
                        },
                        {
                           "vulnerable": true,
                           "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                           "versionStartIncluding": "5.19",
                           "versionEndExcluding": "6.12"
                        }
                     ]
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/8266ae6eafdcd5a3136592445ff4038bbc7ee80e"
            },
            {
               "url": "https://git.kernel.org/stable/c/f7fb5dda555344529ce584ff7a28b109528d2f1b"
            },
            {
               "url": "https://git.kernel.org/stable/c/e5c2dba62996a3a6eeb34bd248b90fc69c5a6a1b"
            },
            {
               "url": "https://git.kernel.org/stable/c/5b97eebcce1b4f3f07a71f635d6aa3af96c236e7"
            }
         ],
         "title": "fbcon: Fix a NULL pointer dereference issue in fbcon_putcs",
         "x_generator": {
            "engine": "bippy-1.2.0"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-50048",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}