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CVE-2021-22555

HIGHCISA KEV

8.3

Description

A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space

CVE Details

CVSS v3.1 Score8.3

SeverityHIGH

CVSS VectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack VectorADJACENT_NETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published7/7/2021

Last Modified10/27/2025

Sourcekev

Honeypot Sightings0

CISA KEV

VendorLinux

ProductKernel

Vulnerability NameLinux Kernel Heap Out-of-Bounds Write Vulnerability

KEV Date Added2025-10-06

Remediation Due Date2025-10-27

Ransomware UseUnknown

Affected Products

brocade:fabric_operating_systemlinux:linux_kernelnetapp:aff_500fnetapp:aff_500f_firmwarenetapp:aff_a250netapp:aff_a250_firmwarenetapp:aff_a400netapp:aff_a400_firmwarenetapp:c250netapp:c250_firmwarenetapp:c400netapp:c400_firmwarenetapp:cloud_backupnetapp:fas_8300netapp:fas_8300_firmwarenetapp:fas_8700netapp:fas_8700_firmwarenetapp:h300snetapp:h300s_firmwarenetapp:h410cnetapp:h410c_firmwarenetapp:h410snetapp:h410s_firmwarenetapp:h500snetapp:h500s_firmwarenetapp:h610cnetapp:h610c_firmwarenetapp:h610snetapp:h610s_firmwarenetapp:h615cnetapp:h615c_firmwarenetapp:h700snetapp:h700s_firmwarenetapp:hci_management_nodenetapp:solidfirenetapp:solidfire_baseboard_management_controller

Weaknesses (CWE)

CWE-787CWE-787

References

http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html(cve-coordination@google.com)

http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html(cve-coordination@google.com)

http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html(cve-coordination@google.com)

http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html(cve-coordination@google.com)

http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html(cve-coordination@google.com)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21(cve-coordination@google.com)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d(cve-coordination@google.com)

https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528(cve-coordination@google.com)

https://security.netapp.com/advisory/ntap-20210805-0010/(cve-coordination@google.com)

http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html(af854a3a-2127-422b-91ae-364da2661108)

http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html(af854a3a-2127-422b-91ae-364da2661108)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21(af854a3a-2127-422b-91ae-364da2661108)

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20210805-0010/(af854a3a-2127-422b-91ae-364da2661108)

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22555(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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