/dev/random broken
Published Jun 11, 2007
1.2
LOWCVSS 2.0
EPSS 0.37%
Description
The random number feature in Linux kernel 2.6 before 2.6.20.13, and 2.6.21.x before 2.6.21.4, (1) does not properly seed pools when there is no entropy, or (2) uses an incorrect cast when extracting entropy, which might cause the random number generator to provide the same values after reboots on systems without an entropy source.
Affected products
No data.
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.0
- 2.6.1
- 2.6.1
- 2.6.1
- 2.6.1
- 2.6.2
- 2.6.2
- 2.6.2
- 2.6.2
- 2.6.3
- 2.6.3
- 2.6.3
- 2.6.3
- 2.6.3
- 2.6.4
- 2.6.4
- 2.6.4
- 2.6.4
- 2.6.5
- 2.6.5
- 2.6.5
- 2.6.5
- 2.6.6
- 2.6.6
- 2.6.6
- 2.6.6
- 2.6.7
- 2.6.7
- 2.6.7
- 2.6.7
- 2.6.8
- 2.6.8
- 2.6.8
- 2.6.8
- 2.6.8
- 2.6.8.1
- 2.6.8.1.5
- 2.6.9
- 2.6.9
- 2.6.9
- 2.6.9
- 2.6.9
- 2.6.10
- 2.6.10
- 2.6.10
- 2.6.10
- 2.6.11
- 2.6.11
- 2.6.11
- 2.6.11
- 2.6.11
- 2.6.11
- 2.6.11.1
- 2.6.11.2
- 2.6.11.3
- 2.6.11.4
- 2.6.11.5
- 2.6.11.6
- 2.6.11.7
- 2.6.11.8
- 2.6.11.9
- 2.6.11.10
- 2.6.11.11
- 2.6.11.12
- 2.6.11_rc1_bk6
- 2.6.12
- 2.6.12
- 2.6.12
- 2.6.12
- 2.6.12
- 2.6.12
- 2.6.12
- 2.6.12.1
- 2.6.12.2
- 2.6.12.3
- 2.6.12.4
- 2.6.12.5
- 2.6.12.6
- 2.6.12.12
- 2.6.12.22
- 2.6.13
- 2.6.13
- 2.6.13
- 2.6.13
- 2.6.13
- 2.6.13
- 2.6.13
- 2.6.13
- 2.6.13.1
- 2.6.13.2
- 2.6.13.3
- 2.6.13.4
- 2.6.13.5
- 2.6.14
- 2.6.14
- 2.6.14
- 2.6.14
- 2.6.14
- 2.6.14
- 2.6.14.1
- 2.6.14.2
- 2.6.14.3
- 2.6.14.4
- 2.6.14.5
- 2.6.14.6
- 2.6.14.7
- 2.6.15
- 2.6.15
- 2.6.15
- 2.6.15
- 2.6.15
- 2.6.15
- 2.6.15
- 2.6.15
- 2.6.15.1
- 2.6.15.2
- 2.6.15.3
- 2.6.15.4
- 2.6.15.5
- 2.6.15.6
- 2.6.15.7
- 2.6.15.11
- 2.6.16
- 2.6.16
- 2.6.16
- 2.6.16
- 2.6.16
- 2.6.16
- 2.6.16
- 2.6.16.1
- 2.6.16.2
- 2.6.16.3
- 2.6.16.4
- 2.6.16.5
- 2.6.16.6
- 2.6.16.7
- 2.6.16.8
- 2.6.16.9
- 2.6.16.10
- 2.6.16.11
- 2.6.16.12
- 2.6.16.13
- 2.6.16.14
- 2.6.16.15
- 2.6.16.16
- 2.6.16.17
- 2.6.16.18
- 2.6.16.19
- 2.6.16.20
- 2.6.16.21
- 2.6.16.22
- 2.6.16.23
- 2.6.16.24
- 2.6.16.25
- 2.6.16.26
- 2.6.16.27
- 2.6.16.28
- 2.6.16.29
- 2.6.16.30
- 2.6.16.31
- 2.6.16.32
- 2.6.16.33
- 2.6.16.34
- 2.6.16.35
- 2.6.16.36
- 2.6.16.37
- 2.6.16.38
- 2.6.16.39
- 2.6.16.40
- 2.6.16.41
- 2.6.16_rc7
- 2.6.17
- 2.6.17
- 2.6.17
- 2.6.17
- 2.6.17
- 2.6.17
- 2.6.17
- 2.6.17.1
- 2.6.17.2
- 2.6.17.3
- 2.6.17.4
- 2.6.17.5
- 2.6.17.6
- 2.6.17.7
- 2.6.17.8
- 2.6.17.9
- 2.6.17.10
- 2.6.17.11
- 2.6.17.12
- 2.6.17.13
- 2.6.17.14
- 2.6.18
- 2.6.18
- 2.6.18
- 2.6.18
- 2.6.18
- 2.6.18
- 2.6.18
- 2.6.18
- 2.6.18.1
- 2.6.18.2
- 2.6.18.3
- 2.6.18.4
- 2.6.18.5
- 2.6.18.6
- 2.6.19
- 2.6.19
- 2.6.19
- 2.6.19
- 2.6.19
- 2.6.19.1
- 2.6.19.2
- 2.6.19.3
- 2.6.20
- 2.6.20.1
- 2.6.20.2
- 2.6.20.3
- 2.6.20.4
- 2.6.20.5
- 2.6.20.6
- 2.6.20.7
- 2.6.20.8
- 2.6.20.9
- 2.6.20.10
- 2.6.20.11
- 2.6.20.12
- 2.6.20.13
- 2.6.20.14
- 2.6.21
- 2.6.21
- 2.6.21
- 2.6.21
- 2.6.21
- 2.6.21
- 2.6.21
- 2.6.21
- 2.6.21.1
- 2.6.21.2
- 2.6.21.3
- 2.6_test9_cvs
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-8.1.6.el5
Fixed · RHSA-2007:0376
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-8.1.6.el5 | Fixed | RHSA-2007:0376 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of the the Linux kernel supplied with Red Hat Enterprise Linux 2.1, 3, or 4. For systems based on Red Hat Enterprise Linux 5, this is only an issue for systems without a real time clock, harddrive activity, or user input during boot time. Red Hat is aware of this issue and is tracking it via the following bug: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=241718 The Red Hat Product Security has rated this issue as having low security impact, a future update may address this flaw. More information regarding issue severity can be found here: https://access.redhat.com/security/updates/classification/
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:L/AC:H/Au:N/C:P/I:N/A:N
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
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.37% (0.00369) | 28.38th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.38% (0.00378) | 29.39th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.14% (0.00142) | 31.80th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.15% (0.00153) | 52.97th | v3 (v2023.03.01) |
| Jan 29, 2024 | 0.07% (0.00074) | 30.44th | v3 (v2023.03.01) |
| Oct 6, 2023 | 0.07% (0.00065) | 27.03th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00062) | 24.20th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.55% (0.01547) | 74.94th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.55% (0.01547) | 51.82th | v2 (v2022.01.01) |
No CWE recorded.
References (31)
- http://marc.info/?l=linux-kernel&m=118128610219959&w=2 mailing-listx_refsource_MLISTPatch
- http://marc.info/?l=linux-kernel&m=118128622431272&w=2 mailing-listx_refsource_MLISTPatch
- http://osvdb.org/37114 vdb-entryx_refsource_OSVDB
- http://secunia.com/advisories/25596 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/25700 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/25961 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26133 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26139 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26450 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26620 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26664 third-party-advisoryx_refsource_SECUNIA
- http://www.debian.org/security/2007/dsa-1356 vendor-advisoryx_refsource_DEBIAN
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.4 x_refsource_CONFIRM
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:171 vendor-advisoryx_refsource_MANDRIVA
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:196 vendor-advisoryx_refsource_MANDRIVA
- http://www.mandriva.com/security/advisories?name=MDKSA-2007:216 vendor-advisoryx_refsource_MANDRIVA
- http://www.novell.com/linux/security/advisories/2007_43_kernel.html vendor-advisoryx_refsource_SUSE
- http://www.novell.com/linux/security/advisories/2007_51_kernel.html vendor-advisoryx_refsource_SUSE
- http://www.securityfocus.com/bid/24390 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1018248 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/usn-470-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/usn-486-1 vendor-advisoryx_refsource_UBUNTU
- http://www.ubuntu.com/usn/usn-489-1 vendor-advisoryx_refsource_UBUNTU
- http://www.vupen.com/english/advisories/2007/2105 vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2007-2453 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=241718 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/34781 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2007-2453
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9960 vdb-entrysignaturex_refsource_OVAL
- https://rhn.redhat.com/errata/RHSA-2007-0376.html vendor-advisoryx_refsource_REDHAT
- https://www.cve.org/CVERecord?id=CVE-2007-2453
Change history (0)
No recorded changes yet.