When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free).

The AlmaLinux 9.2 host has a package installed that is affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1782221814 advisory.

  - When processing files, malloc stores the data of the current line. When processing comments, malloc     incorrectly accesses the released memory (use after free). (CVE-2021-33641)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2023-000153 advisory.

    ** RESERVED ** This candidate has been reserved by an organization or individual that will use it when     announcing a new security problem. When the candidate has been publicized, the details for this candidate     will be provided.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - When processing files, malloc stores the data of the current line. When processing comments, malloc     incorrectly accesses the released memory (use after free). (CVE-2021-33641)

Note that Nessus relies on the presence of the package as reported by the vendor.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-204 advisory.

    When processing files, malloc stores the data of the current line. When processing comments, malloc     incorrectly accesses the released memory (use after free). (CVE-2021-33641)

    When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
    (CVE-2021-33642)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the byacc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - When processing files, malloc stores the data of the current line. When processing comments, malloc     incorrectly accesses the released memory (use after free). (CVE-2021-33641)

  - When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
    (CVE-2021-33642)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Type	Severity
362145	AlmaLinux 9.2 [TuxCare] Security Update: byacc (ALMALINUX9.2:CLSA-2026:1782221814)	Nessus	Alma Linux Local Security Checks	Local	high
348898	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: byacc (UTSA-2023-000153)	Nessus	Unity Linux Local Security Checks	Local	high
223874	Linux Distros Unpatched Vulnerability : CVE-2021-33641	Nessus	Misc.	Local	high
176917	Amazon Linux 2023 : byacc (ALAS2023-2023-204)	Nessus	Amazon Linux Local Security Checks	Local	high
175255	EulerOS 2.0 SP11 : byacc (EulerOS-SA-2023-1756)	Nessus	Huawei Local Security Checks	Local	high
175238	EulerOS 2.0 SP11 : byacc (EulerOS-SA-2023-1778)	Nessus	Huawei Local Security Checks	Local	high
172700	EulerOS 2.0 SP10 : byacc (EulerOS-SA-2023-1545)	Nessus	Huawei Local Security Checks	Local	high
172688	EulerOS 2.0 SP10 : byacc (EulerOS-SA-2023-1520)	Nessus	Huawei Local Security Checks	Local	high
172337	EulerOS 2.0 SP9 : byacc (EulerOS-SA-2023-1436)	Nessus	Huawei Local Security Checks	Local	high
172319	EulerOS 2.0 SP9 : byacc (EulerOS-SA-2023-1461)	Nessus	Huawei Local Security Checks	Local	high

Detections

Analytics

CVE-2021-33641

high

Tenable Plugins

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high

high

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high

high

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