CVEFinder.io

CVE-2026-58094

⚠️ high
Summary

The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. This is intended to be used immediately after creating the object, before any memory is allocated for the object. The handler checked whether a page size had already been configured without holding the rangelock. Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state. An unprivileged local user can exploit th

Description

The FIOSSHMLPGCNF ioctl(2) operation configures the page size for a largepage shared memory object. This is intended to be used immediately after creating the object, before any memory is allocated for the object. The handler checked whether a page size had already been configured without holding the rangelock. Two concurrent callers could both observe an unconfigured object and set conflicting page sizes, leaving the object in an inconsistent state.

An unprivileged local user can exploit this race to escalate privileges.

CVSS Score
7.8
High
EPSS Score
0.1
Exploit Probability
Published Date
2026-08-26
First Seen: 2026-08-28
📊 Relative Risk Intelligence

This CVE is Moderate Risk - more severe than 68.5% of all 365,890 vulnerabilities in our database.

#115,129
Above average severity
Severity Percentile
🎯 CISA SSVC Assessment Updated: Aug 26, 2026
🔍 Exploitation Status
None
No known exploits
⚙️ Automatable
NO
Requires human interaction
💥 Technical Impact
Total
Complete system compromise possible
🏆 Discovered By
tsune of GMO Cybersecurity by Ierae, Inc. working with TrendAI Zero Day Initiative
SSVC data provided by CISA
Last Modified 2026-09-24
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE IDs (Weakness Types)
CWE-367

📦 Affected Products 3

Vendor Product Status Affected Versions
freebsd freebsd Affected
v14.4
freebsd freebsd Affected
v15.0
freebsd freebsd Affected
v15.1

🔗 References 1

https://security.freebsd.org/advisories/FreeBSD-SA-2...
Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-58089 ⚠️ high 7.8 0.1 When a process calls execve(2) to execute a setuid or setgid image, hwpmc(4) is supposed to detach PMCs owned by unprivi... 2026-08-26
CVE-2026-58090 ⚠️ high 7.8 0.2 The SOCK_STREAM receive path in the unix socket implementation failed to fully detach control messages from the socket b... 2026-08-26
CVE-2026-58091 ⚠️ high 7.8 0.2 The implementation of this ioctl attempts to acquire locks on all channels in a sync group. If locking a channel would ... 2026-08-26
CVE-2026-58092 ⚠️ high 8.1 0.4 In FreeBSD 15.0, the kernel structure used to represent user credentials changed: previously the primary group ID was st... 2026-08-26
CVE-2026-58093 ⚠️ high 7.0 0.1 The TIOCSCTTY ioctl handler drops the tty lock in order to acquire the process tree lock. After reacquiring the tty loc... 2026-08-26
CVE-2026-58095 ⚠️ high 8.8 0.6 mp_Enddisc() used incorrect length calculations when formatting endpoint discriminator addresses for display, allowing a... 2026-08-26
These CVEs affect the same products