VDB-392996 · CVE-2026-58084 · EUVD-2026-62338

FreeBSD Kernel up to p1/p11 Timer realtimer_gettime uninitialized pointer

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3.2	$0-$5k	2.13-

Summaryinfo

A vulnerability, which was classified as problematic, was found in FreeBSD Kernel up to p1/p11. Affected is the function realtimer_gettime of the component Timer. Such manipulation leads to uninitialized pointer. This vulnerability is documented as CVE-2026-58084. The attack needs to be performed locally. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in FreeBSD Kernel up to p1/p11. Affected by this issue is the function realtimer_gettime of the component Timer. The manipulation with an unknown input leads to a uninitialized pointer vulnerability. Using CWE to declare the problem leads to CWE-824. The product accesses or uses a pointer that has not been initialized. Impacted is confidentiality. CVE summarizes:

To retrieve the previous timer value, the kernel calls realtimer_gettime(), which obtains the current time for the timer's clock. For a timer using CLOCK_TAI this can fail when no TAI offset has been configured, but the error return was not checked, so the uninitialized output buffer was copied to userspace. An unprivileged local user can obtain uninitialized kernel stack memory by creating a POSIX timer with CLOCK_TAI and calling timer_settime(2), potentially disclosing sensitive kernel data.

The advisory is shared for download at security.freebsd.org. This vulnerability is handled as CVE-2026-58084 since 06/29/2026. The exploitation is known to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version p2 or p12 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-62338). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Operating System

Vendor

FreeBSD

Name

Kernel

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uninitialized pointer
CWE: CWE-824 / CWE-908
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel p2/p12

Timelineinfo

06/29/2026 CVE reserved
08/19/2026 +51 days Advisory disclosed
08/19/2026 +0 days VulDB entry created
08/19/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: security.freebsd.org
Status: Confirmed

CVE: CVE-2026-58084 (🔒)
GCVE (CVE): GCVE-0-2026-58084
GCVE (VulDB): GCVE-100-392996
EUVD: 🔒

Entryinfo

Created: 08/19/2026 09:50
Updated: 08/19/2026 12:05
Changes: 08/19/2026 09:50 (56), 08/19/2026 12:05 (1)
Complete: 🔍
Cache ID: 216::103