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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2024-56549

cachefiles: Fix NULL pointer dereference in object->file

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix NULL pointer dereference in object->file At present, the object->file has the NULL pointer dereference problem in ondemand-mode. The root cause is that the allocated fd and object->file lifetime are inconsistent, and the user-space invocation to anon_fd uses object->file. Following is the process that triggers the issue: [write fd] [umount] cachefiles_ondemand_fd_write_iter fscache_cookie_state_machine cachefiles_withdraw_cookie if (!file) return -ENOBUFS cachefiles_clean_up_object cachefiles_unmark_inode_in_use fput(object->file) object->file = NULL // file NULL pointer dereference! __cachefiles_write(..., file, ...) Fix this issue by add an additional reference count to the object->file before write/llseek, and decrement after it finished.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • c8383054506c77b814489c09877b5db83fd4abf2 to < d6bba3ece960129a553d4b16f1b00c884dc0993aaffected
  • c8383054506c77b814489c09877b5db83fd4abf2 to < 785408bbafcfa24c9fc5b251f03fd0780ce182bdaffected
  • c8383054506c77b814489c09877b5db83fd4abf2 to < f98770440c9bc468e2fd878212ec9526dbe08293affected
  • c8383054506c77b814489c09877b5db83fd4abf2 to < 9582c7664103c9043e80a78f5c382aa6bdd67418affected
  • c8383054506c77b814489c09877b5db83fd4abf2 to < 31ad74b20227ce6b40910ff78b1c604e42975cf1affected

Linux Linux

Default version status: affected

  • 5.19affected
  • 0 to < 5.19unaffected
  • 6.1.129 to ≤ 6.1.*unaffected
  • 6.6.78 to ≤ 6.6.*unaffected
  • 6.11.11 to ≤ 6.11.*unaffected
  • 6.12.2 to ≤ 6.12.*unaffected
  • 6.13 to ≤ *unaffected

References