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TI-2021-10334 Aliases CVE-2021-29626GHSA-h9f8-7jjc-4hg6

Use after free in FreeBSD

Priority LOW 25CWE-416Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

In FreeBSD 13.0-STABLE before n245117, 12.2-STABLE before r369551, 11.4-STABLE before r369559, 13.0-RC5 before p1, 12.2-RELEASE before p6, and 11.4-RELEASE before p9, copy-on-write logic failed to invalidate shared memory page mappings between multiple processes allowing an unprivileged process to maintain a mapping after it is freed, allowing the process to read private data belonging to other processes or the kernel.

Why it matters now

EPSS 0.00336 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
—FreeBSDFreeBSD 12.2-RELEASE before p6, 11.4-RELEASE before p9—No fix listedCNA
  • FreeBSD Vendor— Affected FreeBSD 12.2-RELEASE before p6, 11.4-RELEASE before p9 Fixed in — No fix listed CNA

CPE configurations NVD · 22

CPEVersionsRoleVendor
cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:*before 11.4; 12.0 to before 12.2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:-:*:*:*:*:*:*11.4VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:beta1:*:*:*:*:*:*11.4 beta1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:p1:*:*:*:*:*:*11.4 p1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:p2:*:*:*:*:*:*11.4 p2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:p3:*:*:*:*:*:*11.4 p3VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:p4:*:*:*:*:*:*11.4 p4VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:p5:*:*:*:*:*:*11.4 p5VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:rc1:*:*:*:*:*:*11.4 rc1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:11.4:rc2:*:*:*:*:*:*11.4 rc2VulnerableFreeBSD
  • cpe:2.3:o:freebsd:freebsd:*:*:*:*:*:*:*:* Versions before 11.4; 12.0 to before 12.2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:-:*:*:*:*:*:* Versions 11.4 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:beta1:*:*:*:*:*:* Versions 11.4 beta1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:p1:*:*:*:*:*:* Versions 11.4 p1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:p2:*:*:*:*:*:* Versions 11.4 p2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:p3:*:*:*:*:*:* Versions 11.4 p3 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:p4:*:*:*:*:*:* Versions 11.4 p4 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:p5:*:*:*:*:*:* Versions 11.4 p5 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:rc1:*:*:*:*:*:* Versions 11.4 rc1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:11.4:rc2:*:*:*:*:*:* Versions 11.4 rc2 Vulnerable ·FreeBSD
Show 12 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:freebsd:freebsd:12.2:-:*:*:*:*:*:*12.2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:12.2:p1:*:*:*:*:*:*12.2 p1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:12.2:p2:*:*:*:*:*:*12.2 p2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:beta1:*:*:*:*:*:*13.0 beta1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:beta2:*:*:*:*:*:*13.0 beta2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:beta3:*:*:*:*:*:*13.0 beta3VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:beta4:*:*:*:*:*:*13.0 beta4VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:rc1:*:*:*:*:*:*13.0 rc1VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:rc2:*:*:*:*:*:*13.0 rc2VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:rc3:*:*:*:*:*:*13.0 rc3VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:rc4:*:*:*:*:*:*13.0 rc4VulnerableFreeBSD
cpe:2.3:o:freebsd:freebsd:13.0:rc5:*:*:*:*:*:*13.0 rc5VulnerableFreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.2:-:*:*:*:*:*:* Versions 12.2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.2:p1:*:*:*:*:*:* Versions 12.2 p1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:12.2:p2:*:*:*:*:*:* Versions 12.2 p2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:beta1:*:*:*:*:*:* Versions 13.0 beta1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:beta2:*:*:*:*:*:* Versions 13.0 beta2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:beta3:*:*:*:*:*:* Versions 13.0 beta3 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:beta4:*:*:*:*:*:* Versions 13.0 beta4 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:rc1:*:*:*:*:*:* Versions 13.0 rc1 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:rc2:*:*:*:*:*:* Versions 13.0 rc2 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:rc3:*:*:*:*:*:* Versions 13.0 rc3 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:rc4:*:*:*:*:*:* Versions 13.0 rc4 Vulnerable ·FreeBSD
  • cpe:2.3:o:freebsd:freebsd:13.0:rc5:*:*:*:*:*:* Versions 13.0 rc5 Vulnerable ·FreeBSD

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29626
  2. 2026-10-03 Alias added: GHSA-h9f8-7jjc-4hg6

References

Advisory 2

  • TI-2011-04182 Buffer overflow in libtelnet/encrypt.c in telnetd in FreeBSD 7.3 through 9.0, MIT… CVSS 2.0HIGH 10.0
  • TI-2007-03684 Integer overflow in print-bgp.c in the BGP dissector in tcpdump 3.9.6 and earlier allows… CVSS 3.1CRITICAL 9.8
  • TI-2002-00376 Integer overflow in xdr_array function in RPC servers for operating systems that use… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2003-00437 Off-by-one error in the fb_realpath() function, as derived from the realpath function in… CVSS 3.1CRITICAL 9.8
  • TI-2003-00642 The prescan function in Sendmail 8.12.9 allows remote attackers to execute arbitrary code… CVSS 2.0HIGH 10.0
See all 576 →

Sources

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