glibc: Incorrect attempt to use a 64-bit register for size_t in assembly codes results in segmentation fault
Published Jan 18, 2019
7.8
HIGHCVSS 3.0
EPSS 0.44%
Description
The string component in the GNU C Library (aka glibc or libc6) through 2.28, when running on the x32 architecture, incorrectly attempts to use a 64-bit register for size_t in assembly codes, which can lead to a segmentation fault or possibly unspecified other impact, as demonstrated by a crash in __memmove_avx_unaligned_erms in sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S during a memcpy.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
glibc
Not affected
Red Hat Enterprise Linux 6
glibc
Not affected
Red Hat Enterprise Linux 7
glibc
Not affected
Red Hat Enterprise Linux 8
glibc
Not affected
Red Hat Virtualization 4
glibc
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | glibc | Not affected | n/a |
| Red Hat Enterprise Linux 6 | glibc | Not affected | n/a |
| Red Hat Enterprise Linux 7 | glibc | Not affected | n/a |
| Red Hat Enterprise Linux 8 | glibc | Not affected | n/a |
| Red Hat Virtualization 4 | glibc | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of glibc as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they did not include support for x32.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
AV:L/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.44% (0.00436) | 35.63th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.44% (0.00436) | 37.32th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.06% (0.00063) | 27.34th | v3 (v2023.03.01) |
| Jun 22, 2024 | 0.06% (0.00063) | 26.96th | v3 (v2023.03.01) |
| Jan 12, 2024 | 0.06% (0.00063) | 24.95th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 10.26th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00890) | 30.33th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01412) | 50.22th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.63% (0.03630) | 71.73th | v1 |
| Jan 6, 2022 | 3.63% (0.03630) | 71.48th | v1 |
| Jan 5, 2022 | 0.83% (0.00833) | 58.90th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.83% (0.00833) | 0.00th | v1 |
References (7)
- http://www.securityfocus.com/bid/106671 vdb-entryx_refsource_BIDThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-6488 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1667931 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2019-6488
- https://security.gentoo.org/glsa/202006-04 vendor-advisoryx_refsource_GENTOO
- https://sourceware.org/bugzilla/show_bug.cgi?id=24097 x_refsource_MISCIssue TrackingThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-6488
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/106671 | vdb-entryx_refsource_BIDThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2019-6488 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1667931 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-6488 | ||
| https://security.gentoo.org/glsa/202006-04 | vendor-advisoryx_refsource_GENTOO | |
| https://sourceware.org/bugzilla/show_bug.cgi?id=24097 | x_refsource_MISCIssue TrackingThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-6488 |
Change history (0)
No recorded changes yet.