What is CVE-2022-39842?

CVE-2022-39842 is a medium-severity vulnerability in Linux Kernel, classified under Integer Overflow or Wraparound. CVSS score: 6.1/10. Published 2022-09-05.

How severe is CVE-2022-39842?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2022-39842 known to be exploited?

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

Integer overflow in Linux Kernel

CVE-2022-39842

An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen.

Vulnerability class: Integer Overflow

Published 2022-09-05 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Linux Kernel — versions 5.19
Debian Linux — versions 10.0, 11.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19 (Release Notes, Vendor Advisory)
github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/10/msg00000.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2022/dsa-5257 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/11/msg00001.html (mailing-list, Mailing List, Third Party Advisory)
lore.kernel.org/all/YylaC1wHHyLw22D3@kadam/T/

Frequently asked questions

What is CVE-2022-39842?: CVE-2022-39842 is a medium-severity vulnerability in Linux Kernel, classified under Integer Overflow or Wraparound. CVSS score: 6.1/10. Published 2022-09-05.
How severe is CVE-2022-39842?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2022-39842 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.