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CVE-2021-22555: Linux Kernel

EPSS78.6%No. 635 of 1739 in KEV
CVE year2021~4 yrs before listing
Same vendor in KEV31
Same product31
FieldValue
VendorLinux
ProductKernel
NameLinux Kernel Heap Out-of-Bounds Write Vulnerability
Added to KEV2025-10-06
US federal due date2025-10-27
Ransomware useUnknown
CWECWE-787

CISA description

Linux Kernel contains a heap out-of-bounds write vulnerability that could allow an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space.

Other entries for this product

CVEVendor / productAddedEPSSRansomware
CVE-2026-53266Linux Kernel2026-09-180.8%Unknown
CVE-2025-39964Linux Kernel2026-09-181.2%Unknown
CVE-2025-39682Linux Kernel2026-09-182.8%Unknown
CVE-2026-53362Linux Kernel2026-08-270.7%Unknown
CVE-2022-0995Linux Kernel2026-08-268.7%Unknown
CVE-2022-0492Linux Kernel2026-06-025.5%Unknown
CVE-2026-31431Linux Kernel2026-05-013.4%Unknown
CVE-2018-14634Linux Kernel2026-01-2614.6%Unknown
CVE-2025-38352Linux Kernel2025-09-041.2%Unknown
CVE-2023-0386Linux Kernel2025-06-177.8%Unknown
CVE-2024-53197Linux Kernel2025-04-094.1%Unknown
CVE-2024-53150Linux Kernel2025-04-091.3%Unknown
CVE-2024-50302Linux Kernel2025-03-040.8%Unknown
CVE-2024-53104Linux Kernel2025-02-053.3%Unknown
CVE-2017-1000253Linux Kernel2024-09-0910.6%Known

NVD — CVE-2021-22555

Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.
About this page

A Linux Kernel vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2025-10-06.