CVE-2024-56619

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux2ba466d74ed74f073257f86e61519cb8f8f46184 < 09d6d05579fd46e61abf6e457bb100ff11f3a9d3affected
LinuxLinux2ba466d74ed74f073257f86e61519cb8f8f46184 < e3732102a9d638d8627d14fdf7b208462f0520e0affected
LinuxLinux2ba466d74ed74f073257f86e61519cb8f8f46184 < 48eb6e7404948032bbe811c5affbe39f6b316951affected
LinuxLinux2ba466d74ed74f073257f86e61519cb8f8f46184 < 5af8366625182f01f6d8465c9a3210574673af57affected
LinuxLinux2ba466d74ed74f073257f86e61519cb8f8f46184 < c3afea07477baccdbdec4483f8d5e59d42a3f67faffected
LinuxLinux2ba466d74ed74f073257f86e61519cb8f8f46184 < 31f7b57a77d4c82a34ddcb6ff35b5aa577ef153eaffected
LinuxLinux2ba466d74ed74f073257f86e61519cb8f8f46184 < 985ebec4ab0a28bb5910c3b1481a40fbf7f9e61daffected
LinuxLinux2.6.30affected
LinuxLinux0 < 2.6.30unaffected
LinuxLinux5.4.287 <= 5.4.*unaffected
LinuxLinux5.10.231 <= 5.10.*unaffected
LinuxLinux5.15.174 <= 5.15.*unaffected
LinuxLinux6.1.120 <= 6.1.*unaffected
LinuxLinux6.6.66 <= 6.6.*unaffected
LinuxLinux6.12.5 <= 6.12.*unaffected
LinuxLinux6.13 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

CVE Program Container

Additional References

References