The TSB I-TLB load implementation in arch/sparc/kernel/tsb.S in the Linux kernel before 2.6.33 on the SPARC platform does not properly obtain the value of a certain _PAGE_EXEC_4U bit and consequently does not properly implement a non-executable stack, which makes it easier for context-dependent attackers to exploit stack-based buffer overflows via a crafted application.

References

• https://nvd.nist.gov/vuln/detail/CVE-2010-1451
• http://marc.info/?l=linux-sparc&m=126662159602378&w=2
• http://marc.info/?l=linux-sparc&m=126662196902830&w=2
• http://secunia.com/advisories/39830
• http://www.debian.org/security/2010/dsa-2053
• http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.33
• http://www.openwall.com/lists/oss-security/2010/02/24/1
• http://www.openwall.com/lists/oss-security/2010/05/05/2