CVE-2025-40308: linux

CVSS: UnknownDeferred
AliasesUBUNTU-CVE-2025-40308DEBIAN-CVE-2025-40308
Published 08-12-2025Last modified 23-05-2026
Open JSON

Vulnerability summary

CVE-2025-40308 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.6% of scored vulnerabilities.

Overall risk
0/100
0100
Minimal · default modelHow is this calculated?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 43 · Related 39
DLA-4404-1DLA-4436-1MGASA-2026-0017MGASA-2026-0018OPENSUSE-SU-2026:20145-1SUSE-SU-2026:0278-1

Timeline

  1. 08-12-2025
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bcsp: receive data only if registered Currently, bcsp_recv() can be called even when the BCSP protocol has not been registered. This leads to a NULL pointer dereference, as shown in the following stack trace: KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] RIP: 0010:bcsp_recv+0x13d/0x1740 drivers/bluetooth/hci_bcsp.c:590 Call Trace: <TASK> hci_uart_tty_receive+0x194/0x220 drivers/bluetooth/hci_ldisc.c:627 tiocsti+0x23c/0x2c0 drivers/tty/tty_io.c:2290 tty_ioctl+0x626/0xde0 drivers/tty/tty_io.c:2706 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f To prevent this, ensure that the HCI_UART_REGISTERED flag is set before processing received data. If the protocol is not registered, return -EUNATCH.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

9%

Versus all other CVEs

30-day change

0.00 pp

From 0.19% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.19%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu154 products
  • linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-106.106 | < 6.17.0-14.14
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1050.53 | < 6.17.0-1007.7
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.159-1 | < 6.12.63-1 | < 6.17.8-1
Linux1 product
  • linux≥ 48effdb7a798232db945503cf3f51e0be8070cea, < 39a7d40314b6288cfa2d13269275e9247a7a055a | ≥ 45fa7bd82c6178f4fec0ab94891144a043ec5fe8, < 164586725b47f9d61912e6bf17dbaffeff11710b | ≥ d71a57a34ab6bbc95dc461158403c02e8ff3f912, < b65ca9708bfbf47d8b7bd44b7c574bd16798e9c9 | ≥ 9cf7dccaa7f4c56d2089700e5cb11f85a8d5f6cf, < 8b892dbef3887dbe9afdc7176d1a5fd90e1636aa | ≥ 806464634e7fc6b523160defeeddb1ade2a72f81, < 799cd62cbcc3f12ee04b33ef390ff7d41c37d671 | ≥ 6b7a32fa9bacdebd98c18b2a56994116995ee643, < b420a4c7f915fc1c94ad1f6ca740acc046d94334 | ≥ 366ceff495f902182d42b6f41525c2474caf3f9a, < 55c1519fca830f59a10bbf9aa8209c87b06cf7bc | ≥ 366ceff495f902182d42b6f41525c2474caf3f9a, < ca94b2b036c22556c3a66f1b80f490882deef7a6 | 15543b7bbe7b5f744fdbb44f75b14f81a0117813 | a4b89a45b12b69bc82c8137346b150a118e02c26 | ≥ 5.4.293, < 5.4.302 | ≥ 5.10.237, < 5.10.247 | ≥ 5.15.181, < 5.15.197 | ≥ 6.1.135, < 6.1.159 | ≥ 6.6.88, < 6.6.117 | ≥ 6.12.24, < 6.12.58 | ≥ 6.13.12, < 6.14 | ≥ 6.14.3, < 6.15 | 6.15

3 vendors · 156 products

References

38 links
Show all 38 references