Description
An SSE2-optimized memmove implementation for i386 in sysdeps/i386/i686/multiarch/memcpy-sse2-unaligned.S in the GNU C Library (aka glibc or libc6) 2.21 through 2.27 does not correctly perform the overlapping memory check if the source memory range spans the middle of the address space, resulting in corrupt data being produced by the copy operation. This may disclose information to context-dependent attackers, or result in a denial of service, or, possibly, code execution.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | glibc | 2.27-3 | — |
| Debian 13 | glibc | 2.27-3 | — |
| Debian 12 | glibc | 2.27-3 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | glibc | 2.27-3ubuntu1.2 | USN-4416-1 |
| Ubuntu 16.04 LTS | glibc | 2.23-0ubuntu11.2 | USN-4416-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | glibc | 2.26-13.3.1 | SUSE-SU-2018:1991-1 |
| SLES 12 SP3 | glibc | 2.22-62.13.2 | SUSE-SU-2018:1562-1 |
| SLES 12 SP2 | glibc | 2.22-62.13.2 | SUSE-SU-2018:1562-2, SUSE-SU-2018:1562-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | glibc | 2.22-62.13.2 | SUSE-SU-2018:1562-1 |
| SLES for SAP 12 SP2 | glibc | 2.22-62.13.2 | SUSE-SU-2018:1562-1 |
| SUSE OpenStack Cloud 7 | glibc | 2.22-62.13.2 | SUSE-SU-2018:1562-1 |
| SUSE Enterprise Storage 4 | glibc | 2.22-62.13.2 | SUSE-SU-2018:1562-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | glibc | 2.34-1.2 | openSUSE-SU-2024:10792-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | nscd +199 | 2.26-28.amzn2.0.1 | ALAS2-2018-1048 |
Advisories 6
- USN-4416-1 glibc vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2018:1991-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10792-1 glibc-2.34-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1562-2 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2018:1562-1 Security update for glibc SUSE / openSUSE Security Updates · Feb 4, 2026
- ALAS2-2018-1048 Moderate: glibc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 8, 2018
References
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=cd66c0e584c6d692bc8347b5e72723d02b8a8ada
- https://github.com/fingolfin/memmove-bug
- https://sourceware.org/bugzilla/show_bug.cgi?id=22644
- https://security.netapp.com/advisory/ntap-20190329-0001/
- https://security.netapp.com/advisory/ntap-20190401-0001/
- USN-4416-1 vendor-advisory