Bug#1134544: marked as done (glibc: CVE-2026-5928)

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Your message dated Thu, 18 Jun 2026 20:42:54 +0000
with message-id <[email protected]>
and subject line Bug#1134544: fixed in glibc 2.42-17
has caused the Debian Bug report #1134544,
regarding glibc: CVE-2026-5928
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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--=20
1134544: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D1134544
Debian Bug Tracking System
Contact [email protected] with problems

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From: Salvatore Bonaccorso <[email protected]>
To: Debian Bug Tracking System <[email protected]>
Subject: glibc: CVE-2026-5928
Message-ID: <[email protected]>
X-Mailer: reportbug 13.2.0
Date: Tue, 21 Apr 2026 17:51:37 +0200
Delivered-To: [email protected]

Source: glibc
Version: 2.42-15
Severity: important
Tags: security upstream
Forwarded: https://sourceware.org/bugzilla/show_bug.cgi?id=33998
X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>

Hi,

The following vulnerability was published for glibc.

CVE-2026-5928[0]:
| Calling the ungetwc function on a FILE stream with wide characters
| encoded in a character set that has overlaps between its single byte
| and multi-byte character encodings, in the GNU C Library version
| 2.43 or earlier, may result in an attempt to read bytes before an
| allocated buffer, potentially resulting in unintentional disclosure
| of neighboring data in the heap, or a program crash.  A bug in the
| wide character pushback implementation (_IO_wdefault_pbackfail in
| libio/wgenops.c) causes ungetwc() to operate on the regular
| character buffer (fp->_IO_read_ptr) instead of the actual wide-
| stream read pointer (fp->_wide_data->_IO_read_ptr). The program
| crash may happen in cases where fp->_IO_read_ptr is not initialized
| and hence points to NULL. The buffer under-read requires a special
| situation where the input character encoding is such that there are
| overlaps between single byte representations and multibyte
| representations in that encoding, resulting in spurious matches. The
| spurious match case is not possible in the standard Unicode
| character sets.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-5928
    https://www.cve.org/CVERecord?id=CVE-2026-5928
[1] https://sourceware.org/bugzilla/show_bug.cgi?id=33998
[2] https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0010

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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Source: glibc
Source-Version: 2.42-17
Done: Aurelien Jarno <[email protected]>

We believe that the bug you reported is fixed in the latest version of
glibc, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Aurelien Jarno <[email protected]> (supplier of updated glibc package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])


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Hash: SHA512

Format: 1.8
Date: Thu, 18 Jun 2026 21:48:16 +0200
Source: glibc
Architecture: source
Version: 2.42-17
Distribution: unstable
Urgency: medium
Maintainer: GNU Libc Maintainers <[email protected]>
Changed-By: Aurelien Jarno <[email protected]>
Closes: 1133139 1134543 1134544
Changes:
 glibc (2.42-17) unstable; urgency=3Dmedium
 .
   [ Aurelien Jarno ]
   * debian/patches/git-updates.diff: update from upstream stable branch:
     - Fix buffer overflow in scanf %mc (CVE-2026-5450).  Closes: #1134543.
     - Fix ungetwc operating on byte stream (CVE-2026-5928).  Closes: #113454=
4.
     - Save/restore VFP registers inPLT trampolines on arm.  Closes: #1133139.
     - Suppress iconv intermediate errors with //TRANSLIT.
     - debian/patches/hurd-i386/git-run-iconv-test.sh.diff: rebased.
   * debian/rules.d/build.mk: append extra_cflags to CFLAGS and ASFLAGS.
   * debian/control.in/libc: stop suggesting libnss-nisplus.
   * debian/debhelper.in/libc-bin.lintian-overrides: add a
     statically-linked-binary override for the ldconfig binary.
   * debian/control.in/main: build-depends on libselinux-dev instead of
     libselinux1-dev.
 .
   [ Miao Wang ]
   * debian/libc6.symbols.loong64: add.
 .
   [ Samuel Thibault ]
   * debian/patches/hurd-i386/git-SO_TIMESTAMP.diff: Add SO_TIMESTAMP macro.
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