CVE-2009-1243
net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain...
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."
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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."
- Record
CVE-2009-1243- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-667
- Updated
- 2026-11-02
CVE List No score
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."
- Record
CVE-2009-1243- Updated
- 2026-11-02
EUVDEUVD-2009-1242 No score
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."
- Record
EUVD-2009-1242- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-p5fc-ww5c-rrv7
net/ipv4/udp.c in the Linux kernel before 2.6.29.1 performs an unlocking step in certain...
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."
- Record
GHSA-p5fc-ww5c-rrv7- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-20, CWE-667
- Updated
- 2026-11-02
OSVBELL-CVE-2009-1243
CVE-2009-1243 does not affect BellSoft software
- Record
BELL-CVE-2009-1243- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2009-1243 is a medium vulnerability (CVSS 5.5) in Linux Kernel, published April 6, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 18th percentile. No source names a fixed version.
References
kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.29.1
secunia.com/advisories/34478
openwall.com/lists/oss-security/2009/04/01/4
securityfocus.com/bid/34329
exchange.xforce.ibmcloud.com/vulnerabilities/49595
git.kernel.org?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=30842f2989aacfaba3ccb39829b3417be9313dbe
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vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-proc-net-udp-8586
vupen.com/english/advisories/2009/0924
nvd.nist.gov/vuln/detail/CVE-2009-1243
github.com/advisories/GHSA-p5fc-ww5c-rrv7
docs.bell-sw.com/security/cves/CVE-2009-1243