CVE-2024-56619
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry() Syzbot reported that when searching for records in a directory where the inode's i_size is corrupted and has a…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry() Syzbot reported that when searching for records in a directory where the inode's i_size is corrupted and has a large value, memory access outside the folio/page range may occur, or a use-after-free bug may be detected if KASAN is enabled. This is because nilfs_last_byte(), which is called by nilfs_find_entry() and others to calculate the number of valid bytes of directory data in a page from i_size and the page index, loses the upper 32 bits of the 64-bit size information due to an inappropriate type of local variable to which the i_size value is assigned. This caused a large byte offset value due to underflow in the end address calculation in the calling nilfs_find_entry(), resulting in memory access that exceeds the folio/page size. Fix this issue by changing the type of the local variable causing the bit loss from "unsigned int" to "u64". The return value of nilfs_last_byte() is also of type "unsigned int", but it is truncated so as not to exceed PAGE_SIZE and no bit loss occurs, so no change is required.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.21% probability · 12th 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/09d6d05579fd46e61abf6e457bb100ff11f3a9d3Patch
- https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153ePatch
- https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951Patch
- https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57Patch
- https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61dPatch
- https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67fPatch
- https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0Patch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.