net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the "udp seq_file infrastructure."
Published Apr 6, 2009
5.5
MEDIUMCVSS 3.1
EPSS 0.27%
Description
net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain incorrect circumstances, which allows local users to cause a denial of service (panic) by reading zero bytes from the /proc/net/udp file and unspecified other files, related to the "udp seq_file infrastructure."
Affected products
No data.
- < 2.6.29.1
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 2.1, 3, 4, 5 or Red Hat Enterprise MRG.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:N/I:N/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 3, 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 (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.27% (0.00267) | 17.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.27% (0.00267) | 18.09th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.05% (0.00047) | 11.71th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00042) | 5.12th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.10% (0.01104) | 54.09th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.10% (0.01104) | 52.45th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.10% (0.01104) | 50.41th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.10% (0.01104) | 28.85th | v2 (v2022.01.01) |
References (11)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=30842f2989aacfaba3ccb39829b3417be9313dbe x_refsource_CONFIRMBroken Link
- http://openwall.com/lists/oss-security/2009/04/01/4 mailing-listx_refsource_MLISTMailing ListPatchThird Party Advisory
- http://secunia.com/advisories/34478 third-party-advisoryx_refsource_SECUNIABroken LinkThird Party Advisory
- http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-proc-net-udp-8586 x_refsource_MISCPatchThird Party Advisory
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.1 x_refsource_CONFIRMBroken Link
- http://www.securityfocus.com/bid/34329 vdb-entryx_refsource_BIDBroken LinkPatchThird Party AdvisoryVDB Entry
- http://www.vupen.com/english/advisories/2009/0924 vdb-entryx_refsource_VUPENBroken LinkThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2009-1243 Vendor Advisory
- https://exchange.xforce.ibmcloud.com/vulnerabilities/49595 vdb-entryx_refsource_XFThird Party AdvisoryVDB Entry
- https://nvd.nist.gov/vuln/detail/CVE-2009-1243
- https://www.cve.org/CVERecord?id=CVE-2009-1243
Change history (0)
No recorded changes yet.