Description
In the Linux kernel, the following vulnerability has been resolved: exfat: fix improper check of dentry.stream.valid_size We found an infinite loop bug in the exFAT file system that can lead to a Denial-of-Service (DoS) condition. When a dentry in an exFAT filesystem is malformed, the following system calls — SYS_openat, SYS_ftruncate, and SYS_pwrite64 — can cause the kernel to hang. Root cause analysis shows that the size validation code in exfat_find() does not check whether dentry.stream.valid_size is negative. As a result, the system calls mentioned above can succeed and eventually trigger the DoS issue. This patch adds a check for negative dentry.stream.valid_size to prevent this vulnerability.
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
11a347fb6cef62ce47e84b97c45f2b2497c7593b to < 6c627bcc1896ba62ec793d0c00da74f3c93ce3adaffected11a347fb6cef62ce47e84b97c45f2b2497c7593b to < 204b1b02ee018ba52ad2ece21fe3a8643d66a1b2affected11a347fb6cef62ce47e84b97c45f2b2497c7593b to < 82ebecdc74ff555daf70b811d854b1f32a296beaaffected
Linux Linux
Default version status: affected
6.8affected0 to < 6.8unaffected6.12.59 to ≤ 6.12.*unaffected6.17.9 to ≤ 6.17.*unaffected6.18 to ≤ *unaffected