CVE-2025-39943 — Out-of-bounds Read in Linux

CWE-125 — Out-of-bounds Read46 documents8 sources
Severity
7.1HIGHNVD
OSV7.8OSV5.5OSV3.2
EPSS
0.0%
top 97.08%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
LinuxLinux KernelDebian Linux+2 more
Timeline
PublishedOct 4
Latest updateApr 13

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: smbdirect: validate data_offset and data_length field of smb_direct_data_transfer If data_offset and data_length of smb_direct_data_transfer struct are invalid, out of bounds issue could happen. This patch validate data_offset and data_length field in recv_done.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:HExploitability: 1.8 | Impact: 5.2

Affected Packages7 packages

▶NVDlinux/linux_kernel5.15.1 — 5.15.194+6
▶Debianlinux/linux_kernel< 6.1.158-1+2
▶Ubuntulinux/linux_kernel< 5.15.0-170.180+1
▶CVEListV5linux/linux2ea086e35c3d726a3bacd0a971c1f02a50e98206 — 773fddf976d282ef059c36c575ddb81567acd6bc+6

Patches

Patch: git.kernel.org ↗Patch: git.kernel.org ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

21
OSV
linux-raspi vulnerabilities↗2026-04-01
▶
OSV
linux-raspi, linux-raspi-realtime vulnerabilities↗2026-04-01
▶
OSV
linux-azure-6.8 vulnerabilities↗2026-03-25
▶
OSV
linux-azure vulnerabilities↗2026-03-25
▶
OSV
linux-aws-6.8 vulnerabilities↗2026-03-23
▶

📋Vendor Advisories

23
Ubuntu
Linux kernel (Azure) vulnerabilities↗2026-04-13
▶
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities↗2026-04-09
▶
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities↗2026-04-09
▶
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities↗2026-04-01
▶
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities↗2026-04-01
▶

🕵️Threat Intelligence

1
Bleepingcomputer
Microsoft October 2025 Patch Tuesday fixes 6 zero-days, 172 flaws↗2025-10-14
▶
CVE-2025-39943 — Out-of-bounds Read in Linux | cvebase