What is CVE-2025-21748?

CVE-2025-21748 is a critical-severity vulnerability in Linux, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2025-02-27.

How severe is CVE-2025-21748?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2025-21748 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Linux

CVE-2025-21748

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix integer overflows on 32 bit systems On 32bit systems the addition operations in ipc_msg_alloc() can potentially overflow leading to memory corruption. Add bounds checking using KSMBD_IPC_MAX_PAYLOAD to avoid overflow.

Vulnerability class: Integer Overflow

EPSS: 0.002 (12.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 0626e6641f6b467447c81dd7678a69c66f7746cf, 5.15, 0
Linux Linux_kernel

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

w4zu/Debian_

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2025-21748?: CVE-2025-21748 is a critical-severity vulnerability in Linux, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2025-02-27.
How severe is CVE-2025-21748?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-21748 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.