Perl threads have a working directory race condition where file operations may target unintended paths. If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any third (or more) thread already running. This may lead to unintended operations such as loading code or accessing files from unexpected locations, which a local attacker may be able to exploit. The bug was introduced in commit 11a11ecf4bea72b17d250cfb43c897be1341861e and released in Perl version 5.13.6

The remote Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-f142899732 advisory.

    Fixes CVE-2025-40909 - Clone dirhandles without fchdir

Tenable has extracted the preceding description block directly from the Fedora 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 remote Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-30244ebfc7 advisory.

    Fixes CVE-2025-40909 - Clone dirhandles without fchdir

Tenable has extracted the preceding description block directly from the Fedora 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 remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2025:02051-1 advisory.

    - CVE-2025-40909: do not change the current directory when cloning an open directory handle (bsc#1244079)

Tenable has extracted the preceding description block directly from the SUSE 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 remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2025:02027-1 advisory.

    - CVE-2025-40909: Do not change the current directory when cloning an open directory handle (bsc#1244079).

Tenable has extracted the preceding description block directly from the SUSE 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 version of perl installed on the remote host is prior to 5.16.3-299. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2025-2879 advisory.

    Thread creation while a directory handle is open does a fchdir, affecting other threads (race condition)     (CVE-2025-40909)

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

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

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2025-1007 advisory.

    Thread creation while a directory handle is open does a fchdir, affecting other threads (race condition)     (CVE-2025-40909)

Tenable has extracted the preceding description block directly from the tested product 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 version of perl installed on the remote host is prior to 5.16.3-294.45. It is, therefore, affected by a vulnerability as referenced in the ALAS-2025-1981 advisory.

    Thread creation while a directory handle is open does a fchdir, affecting other threads (race condition)     (CVE-2025-40909)

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

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

ID	Name	Product	Family	Severity
242038	Fedora 41 : perl (2025-f142899732)	Nessus	Fedora Local Security Checks	medium
242024	Fedora 42 : perl (2025-30244ebfc7)	Nessus	Fedora Local Security Checks	medium
240579	SUSE SLES12 Security Update : perl (SUSE-SU-2025:02051-1)	Nessus	SuSE Local Security Checks	medium
240541	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : perl (SUSE-SU-2025:02027-1)	Nessus	SuSE Local Security Checks	medium
238358	Amazon Linux 2 : perl (ALAS-2025-2879)	Nessus	Amazon Linux Local Security Checks	medium
238269	Amazon Linux 2023 : perl, perl-Attribute-Handlers, perl-AutoLoader (ALAS2023-2025-1007)	Nessus	Amazon Linux Local Security Checks	medium
238027	Amazon Linux AMI : perl (ALAS-2025-1981)	Nessus	Amazon Linux Local Security Checks	medium

Detections

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CVE-2025-40909

medium

Tenable Plugins

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