{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrivers: core: synchronize really_probe() and dev_uevent()\n\nSynchronize the dev->driver usage in really_probe() and dev_uevent().\nThese can run in different threads, what can result in the following\nrace condition for dev->driver uninitialization:\n\nThread #1:\n==========\n\nreally_probe() {\n...\nprobe_failed:\n...\ndevice_unbind_cleanup(dev) {\n    ...\n    dev->driver = NULL;   // <= Failed probe sets dev->driver to NULL\n    ...\n    }\n...\n}\n\nThread #2:\n==========\n\ndev_uevent() {\n...\nif (dev->driver)\n      // If dev->driver is NULLed from really_probe() from here on,\n      // after above check, the system crashes\n      add_uevent_var(env, \"DRIVER=%s\", dev->driver->name);\n...\n}\n\nreally_probe() holds the lock, already. So nothing needs to be done\nthere. dev_uevent() is called with lock held, often, too. But not\nalways. What implies that we can't add any locking in dev_uevent()\nitself. So fix this race by adding the lock to the non-protected\npath. This is the path where above race is observed:\n\n dev_uevent+0x235/0x380\n uevent_show+0x10c/0x1f0  <= Add lock here\n dev_attr_show+0x3a/0xa0\n sysfs_kf_seq_show+0x17c/0x250\n kernfs_seq_show+0x7c/0x90\n seq_read_iter+0x2d7/0x940\n kernfs_fop_read_iter+0xc6/0x310\n vfs_read+0x5bc/0x6b0\n ksys_read+0xeb/0x1b0\n __x64_sys_read+0x42/0x50\n x64_sys_call+0x27ad/0x2d30\n do_syscall_64+0xcd/0x1d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nSimilar cases are reported by syzkaller in\n\nhttps://syzkaller.appspot.com/bug?extid=ffa8143439596313a85a\n\nBut these are regarding the *initialization* of dev->driver\n\ndev->driver = drv;\n\nAs this switches dev->driver to non-NULL these reports can be considered\nto be false-positives (which should be \"fixed\" by this commit, as well,\nthough).\n\nThe same issue was reported and tried to be fixed back in 2015 in\n\nhttps://lore.kernel.org/lkml/1421259054-2574-1-git-send-email-a.sangwan@samsung.com/\n\nalready."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/base/core.c"
               ],
               "versions": [
                  {
                     "version": "239378f16aa1",
                     "lessThan": "bb3641a58317",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "239378f16aa1",
                     "lessThan": "13d25e82b6d0",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "239378f16aa1",
                     "lessThan": "760603e30bf1",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "239378f16aa1",
                     "lessThan": "ec772ed7cb21",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "239378f16aa1",
                     "lessThan": "08891eeaa97c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "239378f16aa1",
                     "lessThan": "a42b0060d6ff",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "239378f16aa1",
                     "lessThan": "95d03d369ea6",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "239378f16aa1",
                     "lessThan": "c0a40097f0bc",
                     "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/base/core.c"
               ],
               "versions": [
                  {
                     "version": "2.6.21",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "2.6.21",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.317",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.279",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.221",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.162",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.95",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.35",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9.6",
                     "lessThanOrEqual": "6.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/bb3641a5831789d83a58a39ed4a928bcbece7080"
            },
            {
               "url": "https://git.kernel.org/stable/c/13d25e82b6d00d743c7961dcb260329f86bedf7c"
            },
            {
               "url": "https://git.kernel.org/stable/c/760603e30bf19d7b4c28e9d81f18b54fa3b745ad"
            },
            {
               "url": "https://git.kernel.org/stable/c/ec772ed7cb21b46fb132f89241682553efd0b721"
            },
            {
               "url": "https://git.kernel.org/stable/c/08891eeaa97c079b7f95d60b62dcf0e3ce034b69"
            },
            {
               "url": "https://git.kernel.org/stable/c/a42b0060d6ff2f7e59290a26d5f162a3c6329b90"
            },
            {
               "url": "https://git.kernel.org/stable/c/95d03d369ea647b89e950667f1c3363ea6f564e6"
            },
            {
               "url": "https://git.kernel.org/stable/c/c0a40097f0bc81deafc15f9195d1fb54595cd6d0"
            }
         ],
         "title": "drivers: core: synchronize really_probe() and dev_uevent()",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-39501",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}