CVE-2024-26621

CVE-2024-26621 is a medium-severity vulnerability in Linux Linux Kernel with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: Medium (CVSS 3.x base score 5.5)
• EPSS exploit prediction: 0% (20th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2024-23883
• Affected product: Linux Linux Kernel
• Published: 2024-03-02
• Last modified: 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: mm: huge_memory: don't force huge page alignment on 32 bit commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP boundaries") caused two issues [1] [2] reported on 32 bit system or compat userspace. It doesn't make too much sense to force huge page alignment on 32 bit system due to the constrained virtual address space. [1] https://lore.kernel.org/linux-mm/[email protected]/ [2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/

Frequently asked questions

What is CVE-2024-26621?

In the Linux kernel, the following vulnerability has been resolved: mm: huge_memory: don't force huge page alignment on 32 bit commit efa7df3e3bb5 ("mm: align larger anonymous mappings on THP boundaries") caused two issues [1] [2] reported on 32 bit system or compat userspace. It doesn't make too much sense to force huge page alignment on 32 bit system due to the constrained virtual address space. [1] https://lore.kernel.org/linux-mm/[email protected]/ [2] https://lore.kernel.org/linux-mm/CAJuCfpHXLdQy1a2B6xN2d7quTYwg2OoZseYPZTRpU0eHHKD-sQ@mail.gmail.com/

How severe is CVE-2024-26621?

CVE-2024-26621 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2024-26621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-26621?

CVE-2024-26621 primarily affects Linux Linux Kernel. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-26621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-26621 have an EU (EUVD) identifier?

Yes. CVE-2024-26621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-23883.

When was CVE-2024-26621 published?

CVE-2024-26621 was published on 2024-03-02 and last updated on 2026-06-17.

References

• https://git.kernel.org/stable/c/4ef9ad19e17676b9ef071309bc62020e2373705d
• https://git.kernel.org/stable/c/6ea9aa8d97e6563676094cb35755884173269555
• https://git.kernel.org/stable/c/7432376c913381c5f24d373a87ff629bbde94b47
• https://git.kernel.org/stable/c/87632bc9ecff5ded93433bc0fca428019bdd1cfe
• http://www.openwall.com/lists/oss-security/2024/07/08/3
• http://www.openwall.com/lists/oss-security/2024/07/08/4
• http://www.openwall.com/lists/oss-security/2024/07/08/5
• http://www.openwall.com/lists/oss-security/2024/07/08/6
• http://www.openwall.com/lists/oss-security/2024/07/08/7
• http://www.openwall.com/lists/oss-security/2024/07/08/8
• http://www.openwall.com/lists/oss-security/2024/07/09/1
• http://www.openwall.com/lists/oss-security/2024/07/10/5
• http://www.openwall.com/lists/oss-security/2024/07/10/7
• http://www.openwall.com/lists/oss-security/2024/07/10/8
• http://www.openwall.com/lists/oss-security/2024/07/11/4
• http://www.openwall.com/lists/oss-security/2024/07/11/5
• http://www.openwall.com/lists/oss-security/2024/07/11/7
• http://www.openwall.com/lists/oss-security/2024/07/12/3
• http://www.openwall.com/lists/oss-security/2024/07/13/2
• http://www.openwall.com/lists/oss-security/2024/07/13/7
• http://www.openwall.com/lists/oss-security/2024/07/15/1
• http://www.openwall.com/lists/oss-security/2024/07/15/2
• http://www.openwall.com/lists/oss-security/2024/07/16/1
• http://www.openwall.com/lists/oss-security/2024/07/16/2
• http://www.openwall.com/lists/oss-security/2024/07/29/2
• http://www.openwall.com/lists/oss-security/2024/07/30/2
• https://zolutal.github.io/aslrnt/

Affected products (3)

• cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:6.8:rc1:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:6.8:rc2:*:*:*:*:*:*

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