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CVE-2025-38262

tty: serial: uartlite: register uart driver in init

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.296, 5.15.187, 6.1.143, 6.6.96, 6.12.36, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 238b8721a554a33a451a3f13bdb5be8fe5cfc927 · fixed in 5015eed450005bab6e5cb6810f7a62eab0434fc4; From 238b8721a554a33a451a3f13bdb5be8fe5cfc927 · fixed in 9c905fdbba68a6d73d39a6b7de9b9f0d6c46df87; From 238b8721a554a33a451a3f13bdb5be8fe5cfc927 · fixed in 6db06aaea07bb7c8e33a425cf7b98bf29ee6056e; From 238b8721a554a33a451a3f13bdb5be8fe5cfc927 · fixed in 8e958d10dd0ce5ae674cce460db5c9ca3f25243b; From 238b8721a554a33a451a3f13bdb5be8fe5cfc927 · fixed in 685d29f2c5057b32c7b1b46f2a7d303b926c8f72; From 238b8721a554a33a451a3f13bdb5be8fe5cfc927 · fixed in f5e4229d94792b40e750f30c92bcf7a3107c72ef; From 238b8721a554a33a451a3f13bdb5be8fe5cfc927 · fixed in 6bd697b5fc39fd24e2aa418c7b7d14469f550a93

  • Linux Linux

    2.6.20

  • KernelLinux

    From 2.6.20 · fixed in 5.4.296; From 5.5.0 · fixed in 5.15.187; From 5.16.0 · fixed in 6.1.143; From 6.2.0 · fixed in 6.6.96; From 6.7.0 · fixed in 6.12.36; From 6.13.0 · fixed in 6.15.5

References 7

git.kernel.org