In the Linux kernel 4.13 through 4.16.11, ext4_read_inline_data() in fs/ext4/inline.c performs a memcpy with an untrusted length value in certain circumstances involving a crafted filesystem that stores the system.data extended attribute value in a dedicated inode.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| https://usn.ubuntu.com/3752-2/ | third party advisory vendor advisory |
| http://www.securityfocus.com/bid/104291 | vdb entry third party advisory |
| https://bugs.chromium.org/p/project-zero/issues/detail?id=1580 | third party advisory exploit |
| https://usn.ubuntu.com/3752-3/ | third party advisory vendor advisory |
| https://bugzilla.kernel.org/show_bug.cgi?id=199803 | issue tracking exploit third party advisory |
| https://www.exploit-db.com/exploits/44832/ | exploit vdb entry third party advisory |
| https://access.redhat.com/errata/RHSA-2019:0525 | third party advisory vendor advisory |
| https://usn.ubuntu.com/3752-1/ | third party advisory vendor advisory |