CVE-2023-52566
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…
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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. [konishi.ryusuke@gmail.com: NOTE added to the commit log]
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
- https://git.kernel.org/stable/c/fb1084e63ee56958b0a56e17a50a4fd86445b9c1Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.