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tty: serial: uartlite: register uart driver in init

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: tty: serial: uartlite: register uart driver in init When two instances of uart devices are probing, a concurrency race can occur. If one thread calls uart_register_driver function, which first allocates and assigns memory to 'uart_state' member of uart_driver structure, the other instance can bypass uart driver registration and call ulite_assign. This calls uart_add_one_port, which expects the uart driver to be fully initialized. This leads to a kernel panic due to a null pointer dereference: [ 8.143581] BUG: kernel NULL pointer dereference, address: 00000000000002b8 [ 8.156982] #PF: supervisor write access in kernel mode [ 8.156984] #PF: error_code(0x0002) - not-present page [ 8.156986] PGD 0 P4D 0 ... [ 8.180668] RIP: 0010:mutex_lock+0x19/0x30 [ 8.188624] Call Trace: [ 8.188629] ? __die_body.cold+0x1a/0x1f [ 8.195260] ? page_fault_oops+0x15c/0x290 [ 8.209183] ? __irq_resolve_mapping+0x47/0x80 [ 8.209187] ? exc_page_fault+0x64/0x140 [ 8.209190] ? asm_exc_page_fault+0x22/0x30 [ 8.209196] ? mutex_lock+0x19/0x30 [ 8.223116] uart_add_one_port+0x60/0x440 [ 8.223122] ? proc_tty_register_driver+0x43/0x50 [ 8.223126] ? tty_register_driver+0x1ca/0x1e0 [ 8.246250] ulite_probe+0x357/0x4b0 [uartlite] To prevent it, move uart driver registration in to init function. This will ensure that uart_driver is always registered when probe function is called.

Announced Source revision 1
Original source ↗

CVE-2025-38262

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-38262

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "238b8721a554a33a451a3f13bdb5be8fe5cfc927",
        "lessThan": "5015eed450005bab6e5cb6810f7a62eab0434fc4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "238b8721a554a33a451a3f13bdb5be8fe5cfc927",
        "lessThan": "9c905fdbba68a6d73d39a6b7de9b9f0d6c46df87",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "238b8721a554a33a451a3f13bdb5be8fe5cfc927",
        "lessThan": "6db06aaea07bb7c8e33a425cf7b98bf29ee6056e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "238b8721a554a33a451a3f13bdb5be8fe5cfc927",
        "lessThan": "8e958d10dd0ce5ae674cce460db5c9ca3f25243b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "238b8721a554a33a451a3f13bdb5be8fe5cfc927",
        "lessThan": "685d29f2c5057b32c7b1b46f2a7d303b926c8f72",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "238b8721a554a33a451a3f13bdb5be8fe5cfc927",
        "lessThan": "f5e4229d94792b40e750f30c92bcf7a3107c72ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "238b8721a554a33a451a3f13bdb5be8fe5cfc927",
        "lessThan": "6bd697b5fc39fd24e2aa418c7b7d14469f550a93",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/tty/serial/uartlite.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.20"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.20",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.296",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.187",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.96",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.15.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.16",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/tty/serial/uartlite.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38262

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30552 · Revision 1
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Publisher date
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