PatchTheCVECVE-2026-58089: When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned
CVE-2026-58089 is a high-severity flaw (CVSS 7.8) affecting freebsd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivileged processes. An inverted check meant that this scenario was not handled properly. An unprivileged local user who has attached PMCs to a process can continue monitoring it after the process executes a setuid or setgid binary, contrary to the intended policy.
Why this priority
- High severity
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 7.8 (High) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.1% (top 97%) |
| CISA exploited list | No |
| Weakness | CWE-273 |
| Published | 2026-08-26 |
| Last modified | 2026-09-24 |
Last updated 2026-09-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-58089?
freebsd: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2026-58089 being exploited?
CVE-2026-58089 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-58089 affect?
CVE-2026-58089 affects freebsd. Severity is high (CVSS 7.8). When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivileged processes. An inverted check meant that this scenario was not handled properly. An unprivileged local user who h
How urgent is CVE-2026-58089?
Priority 28/100. High severity
Related CVEs
- CVE-2026-58082 CRITICAL 9.8 MITIGATE The ISO-2022 encoding module used a stack buffer sized to MB_LEN_MAX (6 bytes) for intermediate character outp
- CVE-2026-58081 CRITICAL 9.8 MITIGATE Several encoding modules, including HZ, UTF-7, VIQR, and ZW, did not properly check the size of the caller-sup
- CVE-2026-58085 HIGH 7.5 MITIGATE After dispatching a decrypt operation to OCF and receiving the result, the wg(4) driver failed to check whethe
- CVE-2026-58086 HIGH 8.1 MITIGATE As an inadvertent side effect of an unrelated code change, PRIV_KTRACE was always denied to a jailed root user
- CVE-2026-58083 HIGH 8.4 MITIGATE While the kernel was copying knotes during fork, a knote with a timer-based filter could fire and be enqueued