5.5

CVE-2026-49424: Kernel stack disclosure in Linux compatibility layer

Analyzed
Published 19-08-2026Last modified 26-08-2026

Vulnerability summary

CVE-2026-49424 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in freebsd. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 19-08-2026
    PublishedVulnerability first disclosed.
  2. 26-08-2026
    Last modifiedVulnerability information updated.

Description

The Linux waitid() implementation translates a FreeBSD siginfo_t struct into a stack-declared Linux siginfo_t. It did not first zero the stack struct. An unprivileged user may observe 104 bytes of uninitialized kernel stack data, which may contain sensitive information.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.15% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Freebsd1 product
  • freebsdEOL≥ 15.0-RELEASE, < p11 | ≥ 14.4-RELEASE, < p7 | ≥ 14.3-RELEASE, < p16 | 14.3 | 14.3:p1 | 14.3:p10 | 14.3:p11 | 14.3:p12 | 14.3:p13 | 14.3:p14 | 14.3:p15 | 14.3:p2 | 14.3:p3 | 14.3:p4 | 14.3:p5 | 14.3:p6 | 14.3:p7 | 14.3:p8 | 14.3:p9 | 14.4 | 14.4:p1 | 14.4:p2 | 14.4:p3 | 14.4:p4 | 14.4:p5 | 14.4:p6 | 14.4:rc1 | 15.0 | 15.0:p1 | 15.0:p10 | 15.0:p2 | 15.0:p3 | 15.0:p4 | 15.0:p5 | 15.0:p6 | 15.0:p7 | 15.0:p8 | 15.0:p9

1 vendor · 1 product

References

1 links