CVE-2022-47943

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-12-23 · updated 2026-06-17
Weakness: CWE-125

Description

An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.19 before 5.19.2. There is an out-of-bounds read and OOPS for SMB2_WRITE, when there is a large length in the zero DataOffset case.

Affected products

Linux kernel: from 5.15 before 5.15.62; from 5.16 before 5.18.18; from 5.19 before 5.19.2 — fixed in 5.15.62, 5.18.18, 5.19.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.62, 5.18.18, 5.19.2. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2022/12/23/10
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.2
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ac60778b87e45576d7bfdbd6f53df902654e6f09
https://github.com/torvalds/linux/commit/ac60778b87e45576d7bfdbd6f53df902654e6f09
https://security.netapp.com/advisory/ntap-20230216-0006/
https://www.zerodayinitiative.com/advisories/ZDI-22-1691/
http://www.openwall.com/lists/oss-security/2022/12/23/10
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.2
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ac60778b87e45576d7bfdbd6f53df902654e6f09
https://github.com/torvalds/linux/commit/ac60778b87e45576d7bfdbd6f53df902654e6f09
https://security.netapp.com/advisory/ntap-20230216-0006/
https://www.zerodayinitiative.com/advisories/ZDI-22-1691/

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