Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE

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Summary

CVECVE-2021-22555
StatePUBLISHED
AssignerGoogle
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-07-07 12:15:08 UTC
Updated2026-10-13 18:25:34 UTC
DescriptionA 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

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.786840000 probability, percentile 0.995870000 (date 2026-10-20)

CISA KEV: Listed on 2025-10-06; due 2025-10-27; ransomware use Unknown

Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary8.3HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
2.0[email protected]Primary4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:L/AC:L/Au:N/C:P/I:P/A:P

CISA Known Exploited Vulnerability

VendorLinux
ProductKernel
NameLinux Kernel Heap Out-of-Bounds Write Vulnerability
Required ActionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Noteshttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21 ; https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d ; https://security.netapp.com/advisory/ntap-20210805-0010/ ; https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 ; https://nvd.nist.gov/vuln/detail/CVE-2021-22555

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Hardware Netapp C250 - All All All
Operating System Netapp C250 Firmware - All All All
Hardware Netapp C400 - All All All
Operating System Netapp C400 Firmware - All All All
Hardware Netapp H300s - All All All
Operating System Netapp H300s Firmware - All All All
Hardware Netapp H410c - All All All
Operating System Netapp H410c Firmware - All All All
Hardware Netapp H410s - All All All
Operating System Netapp H410s Firmware - All All All
Hardware Netapp H500s - All All All
Operating System Netapp H500s Firmware - All All All
Hardware Netapp H700s - All All All
Operating System Netapp H700s Firmware - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Linux Kernel affected 2.6.19-rc1 unspecified custom Not specified

References

ReferenceSourceLinkTags
Kernel Live Patch Security Notice LSN-0081-1 ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Exploit, Third Party Advisory, VDB Entry
Kernel Live Patch Security Notice LSN-0083-1 ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Exploit, Third Party Advisory, VDB Entry
Kernel Live Patch Security Notice LSN-0080-1 ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Exploit, Third Party Advisory, VDB Entry
github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
Netfilter x_tables Heap Out-Of-Bounds Write / Privilege Escalation ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Exploit, Third Party Advisory, VDB Entry
CVE-2021-22555 Linux Kernel Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
Linux Kernel Netfilter Heap Out-Of-Bounds Write ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com Third Party Advisory, VDB Entry
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

Vendor Comments And Credit

Discovery Credit

CNA: Andy Nguyen (en)

Legacy QID Mappings

  • 159329 Oracle Enterprise Linux Security Update for kernel (ELSA-2021-3057)
  • 159332 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9395)
  • 159375 Oracle Enterprise Linux Security Update for kernel (ELSA-2021-3327)
  • 179640 Debian Security Update for linux (CVE-2021-22555)
  • 239541 Red Hat Update for kernel (RHSA-2021:3057)
  • 239542 Red Hat Update for kpatch-patch (RHSA-2021:3044)
  • 239543 Red Hat Update for kernel-rt (RHSA-2021:3088)
  • 239566 Red Hat Update for kpatch-patch (RHSA-2021:3181)
  • 239570 Red Hat Update for kernel (RHSA-2021:3173)
  • 239592 Red Hat Update for kpatch-patch (RHSA-2021:3381)
  • 239593 Red Hat Update for kpatch-patch (RHSA-2021:3380)
  • 239594 Red Hat Update for kernel-rt (RHSA-2021:3375)
  • 239599 Red Hat Update for kernel (RHSA-2021:3363)
  • 239602 Red Hat Update for kernel-rt (RHSA-2021:3328)
  • 239603 Red Hat Update for kernel (RHSA-2021:3327)
  • 257109 CentOS Security Update for kernel (CESA-2021:3327)
  • 352831 Amazon Linux Security Advisory for kernel: ALAC2012-2021-030
  • 352832 Amazon Linux Security Advisory for kmod-sfc: ALAC2012-2021-031
  • 352833 Amazon Linux Security Advisory for kmod-mlx5: ALAC2012-2021-032
  • 376748 F5 BIG-IP Application Security Manager (ASM), Local Traffic Manager (LTM), Access Policy Manager (APM) Linux kernel Vulnerability (K06524534)
  • 390220 Oracle Managed Virtualization (VM) Server for x86 Security Update for kernel (OVMSA-2021-0025)
  • 670707 EulerOS Security Update for kernel (EulerOS-SA-2021-2465)
  • 670772 EulerOS Security Update for kernel (EulerOS-SA-2021-2530)
  • 670796 EulerOS Security Update for kernel (EulerOS-SA-2021-2554)
  • 671047 EulerOS Security Update for kernel (EulerOS-SA-2021-2588)
  • 671051 EulerOS Security Update for kernel (EulerOS-SA-2021-2663)
  • 750844 SUSE Enterprise Linux Security Update for kernel (SUSE-SU-2021:2407-1)
  • 750847 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2409-1)
  • 750848 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2416-1)(Sequoia)
  • 750851 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2415-1)(Sequoia)
  • 750864 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2421-1)
  • 750868 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2427-1)
  • 750869 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2422-1)
  • 750877 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:2427-1)
  • 750880 SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2021:2451-1)
  • 750887 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1076-1)
  • 750899 SUSE Enterprise Linux Security Update for the Linux Kernel (Live Patch 36 for SLE 12 SP3) (SUSE-SU-2021:2538-1)
  • 940353 AlmaLinux Security Update for kernel (ALSA-2021:3057)
  • 960074 Rocky Linux Security Update for kernel (RLSA-2021:3057)
  • 960852 Rocky Linux Security Update for kernel-rt (RLSA-2021:3088)

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