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TI-2021-02547 Aliases CVE-2021-3600GHSA-769h-g9v6-cwg7

Out-of-bounds read in linux

Priority LOW 36CWE-125Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 4 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00282 20th percentileScored 2026-11-07
Fix Partial linux (The Linux Kernel Organization): 5.11Red Hat: 2 advisoriesRed Hat: 4 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Linuxlinuxbefore 5.115.11Patch availableCNA
  • linux VendorLinux Affected before 5.11 Fixed in 5.11 Patch available CNA

CPE configurations NVD · 13

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.14.115 to before 4.14.308; 4.15 to before 4.19.206; 4.20 to before 5.4.98; 5.5 to before 5.10.16VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:*5.11 rc1VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:*5.11 rc2VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:*5.11 rc3VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:*5.11 rc4VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:*5.11 rc5VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:*5.11 rc6VulnerableLinux
cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:*5.11 rc7VulnerableLinux
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.14.115 to before 4.14.308; 4.15 to before 4.19.206; 4.20 to before 5.4.98; 5.5 to before 5.10.16 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.11:rc1:*:*:*:*:*:* Versions 5.11 rc1 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.11:rc2:*:*:*:*:*:* Versions 5.11 rc2 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.11:rc3:*:*:*:*:*:* Versions 5.11 rc3 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.11:rc4:*:*:*:*:*:* Versions 5.11 rc4 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.11:rc5:*:*:*:*:*:* Versions 5.11 rc5 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.11:rc6:*:*:*:*:*:* Versions 5.11 rc6 Vulnerable ·Linux
  • cpe:2.3:o:linux:linux_kernel:5.11:rc7:*:*:*:*:*:* Versions 5.11 rc7 Vulnerable ·Linux
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
Show 3 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:*18.04VulnerableCanonical
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0VulnerableRed Hat
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:esm:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat

Remediation

  • Fix · CNA linux (The Linux Kernel Organization) Fixed in 5.11

Red Hat 2 advisories

  • RHSA-2021:4356 Released 2021-11-09 · Red Hat rating Moderate
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-348.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-348.el8, kernel-4.18.0-348.el8, kernel-abi-stablelists-4.18.0-348.el8 +19
  • RHSA-2021:4140 Released 2021-11-09 · Red Hat rating Moderate
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-348.rt7.130.el8, kernel-rt-core-4.18.0-348.rt7.130.el8, kernel-rt-debug-4.18.0-348.rt7.130.el8 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-348.rt7.130.el8, kernel-rt-core-4.18.0-348.rt7.130.el8, kernel-rt-debug-4.18.0-348.rt7.130.el8 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:4356
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:4356
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2021:4140
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2021:4140
Not affected: 2 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-3600
  2. 2026-10-03 Alias added: GHSA-769h-g9v6-cwg7

References

Patch 1

Advisory 1

Other 1

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences