Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() In nilfs_gccache_submit_read_data(), brelse(bh) is called to drop the reference count of bh when the call to nilfs_dat_translate() fails. If the reference count hits 0 and its owner page gets unlocked, bh may be freed. However, bh->b_page is dereferenced to put the page after that, which may result in a use-after-free bug. This patch moves the release operation after unlocking and putting the page. NOTE: The function in question is only called in GC, and in combination with current userland tools, address translation using DAT does not occur in that function, so the code path that causes this issue will not be executed. However, it is possible to run that code path by intentionally modifying the userland GC library or by calling the GC ioctl directly. [[email protected]: NOTE added to the commit log]
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.30, < 4.14.327 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33Patch
- https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2Patch
- https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8Patch
- https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7Patch
- https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bcPatch
- https://git.kernel.org/stable/c/980663f1d189eedafd18d80053d9cf3e2ceb5c8cPatch
- https://git.kernel.org/stable/c/bb61224f6abc8e71bfdf06d7c984e23460875f5bPatch
- https://git.kernel.org/stable/c/fb1084e63ee56958b0a56e17a50a4fd86445b9c1Patch
- https://git.kernel.org/stable/c/193b5a1c6c67c36b430989dc063fe7ea4e200a33Patch
- https://git.kernel.org/stable/c/28df4646ad8b433340772edc90ca709cdefc53e2Patch
- https://git.kernel.org/stable/c/3936e8714907cd55e37c7cc50e50229e4a9042e8Patch
- https://git.kernel.org/stable/c/7130a87ca32396eb9bf48b71a2d42259ae44c6c7Patch
- https://git.kernel.org/stable/c/7ee29facd8a9c5a26079148e36bcf07141b3a6bcPatch
- https://git.kernel.org/stable/c/980663f1d189eedafd18d80053d9cf3e2ceb5c8cPatch
- https://git.kernel.org/stable/c/bb61224f6abc8e71bfdf06d7c984e23460875f5bPatch
FAQ
What is CVE-2023-52566?
CVE-2023-52566 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential use after free in nilfs_gccache_submit_read_data() In nilfs_gccache_submit_read_data(), brelse(bh) is called...
How severe is CVE-2023-52566?
CVE-2023-52566 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-52566?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.