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                            CERT-Renater

                Note d'Information No. 2026/VULN049
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DATE                : 19/01/2026

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running GNU C Library versions 2.30 up
                               to and including 2.42.

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https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0001
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Integer overflow in memalign leads to heap corruption

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.

CVE-Id: CVE-2026-0861
Public-Date: 2026-01-14
Vulnerable-Commit: 9bf8e29ca136094f73f69f725f15c51facc97206 (2.30)
Fix-Commit: c9188d333717d3ceb7e3020011651f424f749f93 (2.43)
Fix-Commit: 7f19ef14fbce095d4c77395e258320cad2ea2b28 (2.30-153)
Fix-Commit: f18446d7b4a423090ee5e328c36b3c2a0f26041c (2.31-166)
Fix-Commit: 8aef9e7a7af9565c0324b4ecb38b30dfa3782fd8 (2.32-151)
Fix-Commit: 011293b4fd748cdd6f95874ba2b6aba9a3df8bff (2.33-275)
Fix-Commit: 2c77e52108a58956c9f674b36e1f59a4e3fdcf4d (2.34-525)
Fix-Commit: 499d1ccafccfe64df1b88deea2fa84d8180e8e8f (2.35-399)
Fix-Commit: fb6b8822175769b5794fb6ea04f2895483a29b61 (2.36-244)
Fix-Commit: 7b913d41a07836def826f2164c52541a9835f324 (2.37-172)
Fix-Commit: 744b63026a29f7eedbbc8e3a01a7f48a6eb0a085 (2.38-212)
Fix-Commit: fb22fd3f5b415dd4cd6f7b5741c2f0412374e242 (2.39-286)
Fix-Commit: bfc4dd9e526eacf3017dd8864ba0848e9d045dd4 (2.40-216)
Fix-Commit: 1e2c1ea4307197ccece0cda574bcfebf9080894c (2.41-121)
Fix-Commit: b0ec8fb689df862171f0f78994a3bdeb51313545 (2.42-49)
Reported-by: Igor Morgenstern, Aisle Research

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