glibc: Integer overflow with enabled tcache
Published Dec 5, 2017
8.1
HIGHCVSS 3.0
EPSS 1.60%
Description
The malloc function in the GNU C Library (aka glibc or libc6) 2.26 could return a memory block that is too small if an attempt is made to allocate an object whose size is close to SIZE_MAX, potentially leading to a subsequent heap overflow. This occurs because the per-thread cache (aka tcache) feature enables a code path that lacks an integer overflow check.
Affected products
No data.
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
| 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 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
AV:N/AC:M/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 1, 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 (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.60% (0.01597) | 74.86th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.60% (0.01597) | 74.65th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.16% (0.00158) | 52.69th | v3 (v2023.03.01) |
| Mar 15, 2024 | 0.16% (0.00160) | 51.43th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.14% (0.00145) | 49.17th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.21% (0.00207) | 57.98th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.24% (0.00242) | 60.36th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.62% (0.00624) | 17.80th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (6)
- https://access.redhat.com/security/cve/CVE-2017-17426 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1524530 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-17426
- https://sourceware.org/bugzilla/show_bug.cgi?id=22375 x_refsource_CONFIRMExploitIssue Tracking
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=34697694e8a93b325b18f25f7dcded55d6baeaf6 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2017-17426
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2017-17426 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1524530 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-17426 | ||
| https://sourceware.org/bugzilla/show_bug.cgi?id=22375 | x_refsource_CONFIRMExploitIssue Tracking | |
| https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Bh=34697694e8a93b325b18f25f7dcded55d6baeaf6 | x_refsource_CONFIRM | |
| https://www.cve.org/CVERecord?id=CVE-2017-17426 |
Change history (0)
No recorded changes yet.