CVE-2023-54317

Description

In the Linux kernel, the following vulnerability has been resolved: dm flakey: don't corrupt the zero page When we need to zero some range on a block device, the function __blkdev_issue_zero_pages submits a write bio with the bio vector pointing to the zero page. If we use dm-flakey with corrupt bio writes option, it will corrupt the content of the zero page which results in crashes of various userspace programs. Glibc assumes that memory returned by mmap is zeroed and it uses it for calloc implementation; if the newly mapped memory is not zeroed, calloc will return non-zeroed memory. Fix this bug by testing if the page is equal to ZERO_PAGE(0) and avoiding the corruption in this case.

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References

Other References

https://git.kernel.org/stable/c/3c4a56ef7c538d16c1738ba0ccea9e7146105b5a https://git.kernel.org/stable/c/63d31617883d64b43b0e2d529f0751f40713ecae https://git.kernel.org/stable/c/98e311be44dbe31ad9c42aa067b2359bac451fda https://git.kernel.org/stable/c/b7f8892f672222dbfcc721f51edc03963212b249 https://git.kernel.org/stable/c/be360c83f2d810493c04f999d69ec9152981e0c0 https://git.kernel.org/stable/c/f2b478228bfdd11e358c5bc197561331f5d5c394 https://git.kernel.org/stable/c/f50714b57aecb6b3dc81d578e295f86d9c73f078 https://git.kernel.org/stable/c/ff60b2bb680ebcaf8890814dd51084a022891469

Frequently Asked Questions

What is CVE-2023-54317? +

In the Linux kernel, the following vulnerability has been resolved: dm flakey: don't corrupt the zero page When we need to zero some range on a block device, the function __blkdev_issue_zero_pages submits a write bio with the bio vector pointing to the zero page. If we use dm-flakey with corrupt bio writes option, it will corrupt the content of the zero page which results in crashes of various userspace programs. Glibc assumes that memory returned by mmap is zeroed and it uses it for calloc implementation; if the newly mapped memory is not zeroed, calloc will return non-zeroed memory. Fix this bug by testing if the page is equal to ZERO_PAGE(0) and avoiding the corruption in this case.

How do I check if I'm vulnerable to CVE-2023-54317? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2023-54317

Description

References

Other References

Frequently Asked Questions

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