SB2026072286 - Multiple vulnerabilities in libseccomp

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Main Vulnerability Database SB2026072286

SB2026072286 - Multiple vulnerabilities in libseccomp

Published: July 22, 2026

Security Bulletin ID SB2026072286
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Integer overflow (CVE-ID: N/A)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause heap corruption.

The vulnerability exists due to integer overflow in seccomp BPF generation in libseccomp when compiling unusually large attacker-controlled seccomp profiles. A remote attacker can supply a specially crafted oversized seccomp profile to cause heap corruption.

This issue can occur when generated BPF instruction counts exceed 65,535 and wrap the internal struct bpf_program.blk_cnt field; the resulting corruption may include a double-free.


2) Double free (CVE-ID: N/A)

CWE-ID: CWE-415 - Double Free

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to double free in _bpf_append_blk() in src/gen_bpf.c when generating BPF filters from an extremely large seccomp rule set. A remote attacker can supply a specially crafted oversized seccomp profile to cause a denial of service.

The issue occurs during filter generation before the filter is loaded into the kernel, and exploitation requires an unusually large non-default rule set of roughly 66,000 rules.


3) Always-Incorrect Control Flow Implementation (CVE-ID: N/A)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass intended seccomp restrictions.

The vulnerability exists due to a logic error in _db_tree_add() in libseccomp filter tree construction when merging multiple rules for the same syscall and the same 64-bit argument using SCMP_CMP_LT or SCMP_CMP_LE. A remote attacker can supply input that reaches a syscall argument range the policy was intended to deny to bypass intended seccomp restrictions.

The issue affects 64-bit architectures only and requires overlapping rules with the same high 32-bit comparison value, different low 32-bit values, and different actions.


Remediation

Install update from vendor's website.

References