NULL pointer dereference triggered by ptrace
Published Sep 17, 2007
4.9
MEDIUMCVSS 2.0
EPSS 0.51%
Description
The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) during ptrace single-step operations, which allows local users to cause a denial of service (NULL dereference and OOPS) via certain code that makes ptrace PTRACE_SETREGS and PTRACE_SINGLESTEP requests, related to the TRACE_IRQS_ON function, and possibly related to the arch_ptrace function.
Affected products
No data.
- 2.6.20
- 2.6.21
No data.
Red Hat Enterprise Linux 5
kernel-0:2.6.18-8.1.15.el5
Fixed · RHSA-2007:0940
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | kernel-0:2.6.18-8.1.15.el5 | Fixed | RHSA-2007:0940 |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 2.1, 3, or 4.
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:N/I:N/A:C
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 (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.51% (0.00512) | 41.47th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.51% (0.00512) | 39.34th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00045) | 10.91th | v4 (v2025.03.14) |
| Feb 9, 2025 | 14.05% (0.14052) | 95.72th | v3 (v2023.03.01) |
| Dec 21, 2024 | 5.72% (0.05722) | 93.25th | v3 (v2023.03.01) |
| Nov 12, 2024 | 4.12% (0.04121) | 92.40th | v3 (v2023.03.01) |
| Jul 2, 2024 | 0.04% (0.00044) | 10.25th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 8.24th | 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) |
References (21)
- http://bugzilla.kernel.org/show_bug.cgi?id=8765 x_refsource_MISCExploit
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=29eb51101c02df517ca64ec472d7501127ad1da8 x_refsource_CONFIRM
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=a10d9a71bafd3a283da240d2868e71346d2aef6f x_refsource_CONFIRM
- http://osvdb.org/37286 vdb-entryx_refsource_OSVDB
- http://secunia.com/advisories/26935 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26955 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/26978 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/27322 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/29159 third-party-advisoryx_refsource_SECUNIA
- http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0094 x_refsource_CONFIRM
- http://www.debian.org/security/2007/dsa-1378 vendor-advisoryx_refsource_DEBIAN
- http://www.redhat.com/support/errata/RHSA-2007-0940.html vendor-advisoryx_refsource_REDHAT
- http://www.securityfocus.com/archive/1/488972/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/25801 vdb-entryx_refsource_BID
- http://www.ubuntu.com/usn/usn-518-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2007-3731 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=248324 x_refsource_CONFIRMPatchIssue Tracking
- https://issues.rpath.com/browse/RPL-2304 x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2007-3731
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10394 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2007-3731
Change history (0)
No recorded changes yet.