Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c8383054506c77b814489c09877b5db83fd4abf2 before d6bba3ece960129a553d4b16f1b00c884dc0993a; affected c8383054506c77b814489c09877b5db83fd4abf2 before 785408bbafcfa24c9fc5b251f03fd0780ce182bd; affected c8383054506c77b814489c09877b5db83fd4abf2 before f98770440c9bc468e2fd878212ec9526dbe08293; affected c8383054506c77b814489c09877b5db83fd4abf2 before 9582c7664103c9043e80a78f5c382aa6bdd67418; affected c8383054506c77b814489c09877b5db83fd4abf2 before 31ad74b20227ce6b40910ff78b1c604e42975cf1 |
| Linux / Linux | affected 5.19; unaffected 0 before 5.19; unaffected 6.1.129 through 6.1.*; unaffected 6.6.78 through 6.6.*; unaffected 6.11.11 through 6.11.*; unaffected 6.12.2 through 6.12.*; unaffected 6.13 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a
- https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd
- https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293
- https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418
- https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.