CVE-2022-49148

Summary

In the Linux kernel, the following vulnerability has been resolved:

watch_queue: Free the page array when watch_queue is dismantled

Commit 7ea1a0124b6d ("watch_queue: Free the alloc bitmap when the watch_queue is torn down") took care of the bitmap, but not the page array.

BUG: memory leak unreferenced object 0xffff88810d9bc140 (size 32): comm "syz-executor335", pid 3603, jiffies 4294946994 (age 12.840s) hex dump (first 32 bytes): 40 a7 40 04 00 ea ff ff 00 00 00 00 00 00 00 00 @.@…………. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ……………. backtrace: kmalloc_array include/linux/slab.h:621 [inline] kcalloc include/linux/slab.h:652 [inline] watch_queue_set_size+0x12f/0x2e0 kernel/watch_queue.c:251 pipe_ioctl+0x82/0x140 fs/pipe.c:632 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc73be61cede5882f9605a852414db559c0ebedfd < 7169f60110915c8b53bffd43741fa020a75eb87aaffected
LinuxLinuxc73be61cede5882f9605a852414db559c0ebedfd < 4913daecd04addb41bc96a9175a885e1c19862a8affected
LinuxLinuxc73be61cede5882f9605a852414db559c0ebedfd < 3963a5d1ff75585bddf0c3a918566a6be09d7520affected
LinuxLinuxc73be61cede5882f9605a852414db559c0ebedfd < 375cd2536494cfbcdda84ae8b3e35bf19d0250b9affected
LinuxLinuxc73be61cede5882f9605a852414db559c0ebedfd < b490207017ba237d97b735b2aa66dc241ccd18f5affected
LinuxLinux5.8affected
LinuxLinux0 < 5.8unaffected
LinuxLinux5.10.110 <= 5.10.*unaffected
LinuxLinux5.15.33 <= 5.15.*unaffected
LinuxLinux5.16.19 <= 5.16.*unaffected
LinuxLinux5.17.2 <= 5.17.*unaffected
LinuxLinux5.18 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References