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CVE-2023-54317

HIGHCVSS 7.8/10EPSS 0.18%

Last modified

CVE-2023-54317 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.18%

7.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c6cd92fcabd6cc78bb1808c6a18245c842722fc1, < b7f8892f672222dbfcc721f51edc03963212b249; >= d4c637af2e56ee1ec66ee34d0ac5a13c75911aec, < 98e311be44dbe31ad9c42aa067b2359bac451fda; >= a00f5276e26636cbf72f24f79831026d2e2868e7, < 3c4a56ef7c538d16c1738ba0ccea9e7146105b5a; >= a00f5276e26636cbf72f24f79831026d2e2868e7, < f2b478228bfdd11e358c5bc197561331f5d5c394; >= a00f5276e26636cbf72f24f79831026d2e2868e7, < ff60b2bb680ebcaf8890814dd51084a022891469; >= a00f5276e26636cbf72f24f79831026d2e2868e7, < be360c83f2d810493c04f999d69ec9152981e0c0; >= a00f5276e26636cbf72f24f79831026d2e2868e7, < 63d31617883d64b43b0e2d529f0751f40713ecae; >= a00f5276e26636cbf72f24f79831026d2e2868e7, < f50714b57aecb6b3dc81d578e295f86d9c73f078; 1ed7c9f45fb893877ffa7cedd7aa61beaadbb328; >= 4.14.158, < 4.14.308; >= 4.19.88, < 4.19.276; >= 4.9.206, < 4.10
LinuxLinux5.0

References

Timeline

Published
Last Modified
Status
Deferred

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 severe is CVE-2023-54317?
CVE-2023-54317 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2023-54317?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST