kernel: information leak in sigaltstack
Published Aug 18, 2009
4.9
MEDIUMCVSS 2.0
EPSS 0.94%
Description
The do_sigaltstack function in kernel/signal.c in Linux kernel 2.4 through 2.4.37 and 2.6 before 2.6.31-rc5, when running on 64-bit systems, does not clear certain padding bytes from a structure, which allows local users to obtain sensitive information from the kernel stack via the sigaltstack function.
Affected products
No data.
- 2.6.24.7
- 2.6.25.15
- ≤ 2.6.16.31
- 2.6
- 2.6.0
- 2.6.1
- 2.6.10
- 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
- 2.6.12
- 2.6.12.1
- 2.6.12.2
- 2.6.12.3
- 2.6.12.4
- 2.6.12.5
- 2.6.12.6
- 2.6.13
- 2.6.13.1
- 2.6.13.2
- 2.6.13.3
- 2.6.13.4
- 2.6.13.5
- 2.6.14
- 2.6.14.1
- 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
- 2.6.15.1
- 2.6.15.2
- 2.6.15.3
- 2.6.15.4
- 2.6.15.5
- 2.6.15.6
- 2.6.15.7
- 2.6.16
- 2.6.16.1
- 2.6.16.2
- 2.6.16.3
- 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
- 2.6.16.31
- 2.6.16.31
- 2.6.16.31
- 2.6.16.31
No data.
MRG for RHEL-5
kernel-rt-0:2.6.24.7-132.el5rt
Fixed · RHSA-2009:1239
Red Hat Enterprise Linux 4
kernel-0:2.6.9-89.0.11.EL
Fixed · RHSA-2009:1438
Red Hat Enterprise Linux 5
kernel-0:2.6.18-164.el5
Fixed · RHSA-2009:1243
Red Hat Enterprise Linux 5.3.Z - Server Only
kernel-0:2.6.18-128.8.1.el5
Fixed · RHSA-2009:1466
| Product | Package | State | Advisory |
|---|---|---|---|
| MRG for RHEL-5 | kernel-rt-0:2.6.24.7-132.el5rt | Fixed | RHSA-2009:1239 |
| Red Hat Enterprise Linux 4 | kernel-0:2.6.9-89.0.11.EL | Fixed | RHSA-2009:1438 |
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-164.el5 | Fixed | RHSA-2009:1243 |
| Red Hat Enterprise Linux 5.3.Z - Server Only | kernel-0:2.6.18-128.8.1.el5 | Fixed | RHSA-2009:1466 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue is not planned to be fixed in Red Hat Enterprise Linux 3, due to this product being in Production 3 of its maintenance life-cycle, where only qualified security errata of important or critical impact are addressed. For further information about Errata Support Policy, visit: https://access.redhat.com/support/policy/updates/errata/
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:L/Au:N/C:C/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 (8 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.94% (0.00938) | 59.47th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.94% (0.00938) | 56.09th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.18% (0.00185) | 38.03th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 0.34th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 0.50th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.22% (0.03220) | 84.21th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.22% (0.03220) | 82.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.22% (0.03220) | 65.30th | v2 (v2022.01.01) |
No CWE recorded.
References (24)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=0083fc2c50e6c5127c2802ad323adf8143ab7856 x_refsource_CONFIRM
- http://rhn.redhat.com/errata/RHSA-2009-1243.html vendor-advisoryx_refsource_REDHAT
- http://secunia.com/advisories/36136 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/36501 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/36562 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/36759 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/37105 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/37471 third-party-advisoryx_refsource_SECUNIA
- http://www.exploit-db.com/exploits/9352 exploitx_refsource_EXPLOIT-DB
- http://www.openwall.com/lists/oss-security/2009/08/04/1 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2009/08/05/1 mailing-listx_refsource_MLISTPatch
- http://www.openwall.com/lists/oss-security/2009/08/26/2 mailing-listx_refsource_MLIST
- http://www.redhat.com/support/errata/RHSA-2009-1438.html vendor-advisoryx_refsource_REDHAT
- http://www.securityfocus.com/archive/1/507985/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.ubuntu.com/usn/USN-852-1 vendor-advisoryx_refsource_UBUNTU
- http://www.vmware.com/security/advisories/VMSA-2009-0016.html x_refsource_CONFIRM
- http://www.vupen.com/english/advisories/2009/3316 vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2009-2847 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=515392 x_refsource_CONFIRMPatchIssue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2009-2847
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10637 vdb-entrysignaturex_refsource_OVAL
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8405 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2009-2847
- https://www.redhat.com/archives/fedora-package-announce/2009-August/msg01256.html vendor-advisoryx_refsource_FEDORA
Change history (0)
No recorded changes yet.