CVE-2009-2847

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2009-08-18 · updated 2026-06-16

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

Linux Kernel: 2.6.24.7, 2.6.25.15
Linux kernel: through 2.6.16.31; 2.6, 2.6.0, 2.6.1, 2.6.10, 2.6.11, 2.6.11.1 (+70)

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=0083fc2c50e6c5127c2802ad323adf8143ab7856
http://rhn.redhat.com/errata/RHSA-2009-1243.html
http://secunia.com/advisories/36136
http://secunia.com/advisories/36501
http://secunia.com/advisories/36562
http://secunia.com/advisories/36759
http://secunia.com/advisories/37105
http://secunia.com/advisories/37471
http://www.exploit-db.com/exploits/9352
http://www.openwall.com/lists/oss-security/2009/08/04/1
http://www.openwall.com/lists/oss-security/2009/08/05/1
http://www.openwall.com/lists/oss-security/2009/08/26/2

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