Vulnerability-Lookup

CVE-2026-0861 (GCVE-0-2026-0861)

Vulnerability from cvelistv5 – Published: 2026-01-14 21:01 – Updated: 2026-01-16 17:06

Title

Integer overflow in memalign leads to heap corruption

Summary

Passing too large an alignment to the memalign suite of functions (memalign, posix_memalign, aligned_alloc) in the GNU C Library version 2.30 to 2.42 may result in an integer overflow, which could consequently result in a heap corruption. Note that the attacker must have control over both, the size as well as the alignment arguments of the memalign function to be able to exploit this. The size parameter must be close enough to PTRDIFF_MAX so as to overflow size_t along with the large alignment argument. This limits the malicious inputs for the alignment for memalign to the range [1<<62+ 1, 1<<63] and exactly 1<<63 for posix_memalign and aligned_alloc. Typically the alignment argument passed to such functions is a known constrained quantity (e.g. page size, block size, struct sizes) and is not attacker controlled, because of which this may not be easily exploitable in practice. An application bug could potentially result in the input alignment being too large, e.g. due to a different buffer overflow or integer overflow in the application or its dependent libraries, but that is again an uncommon usage pattern given typical sources of alignments.

Severity ?

8.4 (High)


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

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

glibc

References

URL

Tags

	https://sourceware.org/bugzilla/show_bug.cgi?id=33796
	https://sourceware.org/git/?p=glibc.git;a=blob_pl…

Impacted products

	Vendor	Product	Version
	The GNU C Library	glibc	Affected: 2.30 , ≤ 2.42 (custom)

Credits

Igor Morgenstern, Aisle Research

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-0861

Vulnerability from fkie_nvd - Published: 2026-01-14 21:15 - Updated: 2026-01-16 18:16

Severity ?

8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	3ff69d7a-14f2-4f67-a097-88dee7810d18	https://sourceware.org/bugzilla/show_bug.cgi?id=33796
	3ff69d7a-14f2-4f67-a097-88dee7810d18	https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0001
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/01/16/5

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    }
  ],
  "id": "CVE-2026-0861",
  "lastModified": "2026-01-16T18:16:09.343",
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GHSA-5PF6-63V3-88HW

Vulnerability from github – Published: 2026-01-14 21:34 – Updated: 2026-01-16 18:31

Details

Passing too large an alignment to the memalign suite of functions (memalign, posix_memalign, aligned_alloc, valloc, pvalloc) in the GNU C Library version 2.30 to 2.42 may result in an integer overflow, which could consequently result in a heap corruption.

Severity ?

8.4 (High)


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

Show details on source website

JSON

To clipboard

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  },
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  "id": "GHSA-5pf6-63v3-88hw",
  "modified": "2026-01-16T18:31:23Z",
  "published": "2026-01-14T21:34:10Z",
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      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-0861 (GCVE-0-2026-0861)

FKIE_CVE-2026-0861

GHSA-5PF6-63V3-88HW

Tags

Sightings

Nomenclature