Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2ba466d74ed74f073257f86e61519cb8f8f46184 before 09d6d05579fd46e61abf6e457bb100ff11f3a9d3; affected 2ba466d74ed74f073257f86e61519cb8f8f46184 before e3732102a9d638d8627d14fdf7b208462f0520e0; affected 2ba466d74ed74f073257f86e61519cb8f8f46184 before 48eb6e7404948032bbe811c5affbe39f6b316951; affected 2ba466d74ed74f073257f86e61519cb8f8f46184 before 5af8366625182f01f6d8465c9a3210574673af57; affected 2ba466d74ed74f073257f86e61519cb8f8f46184 before c3afea07477baccdbdec4483f8d5e59d42a3f67f; affected 2ba466d74ed74f073257f86e61519cb8f8f46184 before 31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e; affected 2ba466d74ed74f073257f86e61519cb8f8f46184 before 985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d |
| Linux / Linux | affected 2.6.30; unaffected 0 before 2.6.30; unaffected 5.4.287 through 5.4.*; unaffected 5.10.231 through 5.10.*; unaffected 5.15.174 through 5.15.*; unaffected 6.1.120 through 6.1.*; unaffected 6.6.66 through 6.6.*; unaffected 6.12.5 through 6.12.*; unaffected 6.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/09d6d05579fd46e61abf6e457bb100ff11f3a9d3
- https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0
- https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951
- https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57
- https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67f
- https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e
- https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.