CVE-2025-38262: debian debian_linux NULL Pointer Dereference
Vulnerability summary
CVE-2025-38262 is a high (CVSS 7.8) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 7.7% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 40 · Related 36Timeline
- 09-07-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
EPSS trend
Probability
0.19%
Chance of exploitation in the next 30 days
Percentile
8%
Versus all other CVEs
30-day change
+0.02 pp
From 0.17% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu146 products
- linuxAll versions (No fix recorded) | < 5.15.0-156.166 | < 6.8.0-100.100
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1092.99 | < 6.8.0-1046.49
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.147-1 | < 6.12.37-1
- debian_linuxEOL11.0
Linux2 products
- linux≥ 238b8721a554a33a451a3f13bdb5be8fe5cfc927, < 5015eed450005bab6e5cb6810f7a62eab0434fc4 | ≥ 238b8721a554a33a451a3f13bdb5be8fe5cfc927, < 9c905fdbba68a6d73d39a6b7de9b9f0d6c46df87 | ≥ 238b8721a554a33a451a3f13bdb5be8fe5cfc927, < 6db06aaea07bb7c8e33a425cf7b98bf29ee6056e | ≥ 238b8721a554a33a451a3f13bdb5be8fe5cfc927, < 8e958d10dd0ce5ae674cce460db5c9ca3f25243b | ≥ 238b8721a554a33a451a3f13bdb5be8fe5cfc927, < 685d29f2c5057b32c7b1b46f2a7d303b926c8f72 | ≥ 238b8721a554a33a451a3f13bdb5be8fe5cfc927, < f5e4229d94792b40e750f30c92bcf7a3107c72ef | ≥ 238b8721a554a33a451a3f13bdb5be8fe5cfc927, < 6bd697b5fc39fd24e2aa418c7b7d14469f550a93 | 2.6.20
- linux_kernel≥ 2.6.20, < 5.4.296 | ≥ 5.5, < 5.15.187 | ≥ 5.16, < 6.1.143 | ≥ 6.2, < 6.6.96 | ≥ 6.7, < 6.12.36 | ≥ 6.13, < 6.15.5
3 vendors · 150 products
