glibc: memory corruption in memcpy-sse2-unaligned.S
Published May 18, 2018
9.8
CRITICALCVSS 3.0
EPSS 4.63%
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.
Affected products
No data.
Running on/with
- n/a
No data.
Red Hat Enterprise Linux 5
compat-glibc
Not affected
Red Hat Enterprise Linux 5
glibc
Not affected
Red Hat Enterprise Linux 6
compat-glibc
Not affected
Red Hat Enterprise Linux 6
glibc
Not affected
Red Hat Enterprise Linux 7
compat-glibc
Not affected
Red Hat Enterprise Linux 7
glibc
Not affected
Red Hat Enterprise Linux 8
glibc
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | compat-glibc | Not affected | n/a |
| Red Hat Enterprise Linux 5 | glibc | Not affected | n/a |
| Red Hat Enterprise Linux 6 | compat-glibc | Not affected | n/a |
| Red Hat Enterprise Linux 6 | glibc | Not affected | n/a |
| Red Hat Enterprise Linux 7 | compat-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 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of glibc and compat-glibc as shipped with Red Hat Enterprise Linux 5, 6 and 7 as they did not include the vulnerable code.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AV:N/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 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (22 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 4.63% (0.04629) | 91.43th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.83% (0.04831) | 90.82th | v5 (v2026.06.15) |
| Oct 12, 2025 | 0.83% (0.00830) | 73.70th | v4 (v2025.03.14) |
| Aug 19, 2025 | 1.98% (0.01976) | 82.79th | v4 (v2025.03.14) |
| Mar 30, 2025 | 0.77% (0.00772) | 71.27th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.68% (0.03684) | 79.60th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.39% (0.00391) | 58.06th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.63% (0.00629) | 79.71th | v3 (v2023.03.01) |
| Apr 27, 2024 | 0.63% (0.00629) | 78.76th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.64% (0.00638) | 78.49th | v3 (v2023.03.01) |
| Jul 8, 2023 | 0.64% (0.00638) | 76.32th | v3 (v2023.03.01) |
| May 12, 2023 | 0.46% (0.00465) | 71.81th | v3 (v2023.03.01) |
| May 8, 2023 | 0.48% (0.00483) | 72.30th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.66% (0.00663) | 76.49th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.71% (0.02714) | 82.86th | v2 (v2022.01.01) |
| Feb 12, 2023 | 2.71% (0.02714) | 82.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.64% (0.02641) | 80.45th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.64% (0.02641) | 61.81th | v2 (v2022.01.01) |
| Feb 3, 2022 | 3.14% (0.03139) | 65.22th | v1 |
| Jan 6, 2022 | 3.14% (0.03139) | 64.88th | v1 |
| Sep 1, 2021 | 3.14% (0.03139) | 81.29th | v1 |
| Apr 14, 2021 | 3.14% (0.03139) | 0.00th | v1 |
References (10)
- https://access.redhat.com/security/cve/CVE-2017-18269 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1580924 Issue Tracking
- https://github.com/fingolfin/memmove-bug x_refsource_MISCThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-18269
- https://security.netapp.com/advisory/ntap-20190329-0001/ x_refsource_CONFIRM
- https://security.netapp.com/advisory/ntap-20190401-0001/ x_refsource_CONFIRM
- https://sourceware.org/bugzilla/show_bug.cgi?id=22644 x_refsource_MISCIssue Tracking
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=cd66c0e584c6d692bc8347b5e72723d02b8a8ada x_refsource_MISC
- https://usn.ubuntu.com/4416-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2017-18269
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2017-18269 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1580924 | Issue Tracking | |
| https://github.com/fingolfin/memmove-bug | x_refsource_MISCThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-18269 | ||
| https://security.netapp.com/advisory/ntap-20190329-0001/ | x_refsource_CONFIRM | |
| https://security.netapp.com/advisory/ntap-20190401-0001/ | x_refsource_CONFIRM | |
| https://sourceware.org/bugzilla/show_bug.cgi?id=22644 | x_refsource_MISCIssue Tracking | |
| https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=cd66c0e584c6d692bc8347b5e72723d02b8a8ada | x_refsource_MISC | |
| https://usn.ubuntu.com/4416-1/ | vendor-advisoryx_refsource_UBUNTU | |
| https://www.cve.org/CVERecord?id=CVE-2017-18269 |
Change history (0)
No recorded changes yet.