01 Record

CVE-2026-23406

apparmor: fix side-effect bug in match_char() macro usage

HighPUBLISHEDCNA: Linux

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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02 Description

apparmor: fix side-effect bug in match_char() macro usage

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.18% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 7.5% of scored records. A rank, not a probability.
NVD base score: 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD analysis status: Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity: No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-04-01 08:36Z5 MO AGO

Last updated

2026-08-05 12:21Z1 MO AGO

Reserved

2026-01-13

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-125Out-of-bounds ReadBase
CWE-788Access of Memory Location After End of BufferBase

Data version

5.2

Document digest

a5cb4cea03b20dce0b73c27b6de717aecd63b1c63d0467a94da88971a48ea51c

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux074c1cd798cb0b481d7eaa749b64aa416563c053 to < c7dc56d8b37eda1396feeec3ab1c7ecee5eae31b, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < f16f2e5936c0f5f0d11fdf10d2be3e47e7108e42, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 1fc94f16098213d01e56c97feed9b3ecf0147a37, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 5a184f7cbdeaad17e16dedf3c17d0cd622edfed8, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < b73c1dff8a9d7eeaebabf8097a5b2de192f40913, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 0510d1ba0976f97f521feb2b75b0572ea5df3ceb, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 383b7270faf42564f133134c2fc3c24bbae52615, 074c1cd798cb0b481d7eaa749b64aa416563c053 to < 8756b68edae37ff546c02091989a4ceab3f20abd, 4.17—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/c7dc56d8b37eda1396feeec3ab1c7ecee5eae31b
git.kernel.orghttps://git.kernel.org/stable/c/f16f2e5936c0f5f0d11fdf10d2be3e47e7108e42
git.kernel.orghttps://git.kernel.org/stable/c/1fc94f16098213d01e56c97feed9b3ecf0147a37
git.kernel.orghttps://git.kernel.org/stable/c/5a184f7cbdeaad17e16dedf3c17d0cd622edfed8
git.kernel.orghttps://git.kernel.org/stable/c/b73c1dff8a9d7eeaebabf8097a5b2de192f40913
git.kernel.orghttps://git.kernel.org/stable/c/0510d1ba0976f97f521feb2b75b0572ea5df3ceb
git.kernel.orghttps://git.kernel.org/stable/c/383b7270faf42564f133134c2fc3c24bbae52615
git.kernel.orghttps://git.kernel.org/stable/c/8756b68edae37ff546c02091989a4ceab3f20abd

01 Record index

CVE-2026-23406

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2026-23406

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References