CVE-2022-49381

Summary

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

jffs2: fix memory leak in jffs2_do_fill_super

If jffs2_iget() or d_make_root() in jffs2_do_fill_super() returns an error, we can observe the following kmemleak report:

unreferenced object 0xffff888105a65340 (size 64): comm "mount", pid 710, jiffies 4302851558 (age 58.239s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 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: [<ffffffff859c45e5>] kmem_cache_alloc_trace+0x475/0x8a0 [<ffffffff86160146>] jffs2_sum_init+0x96/0x1a0 [<ffffffff86140e25>] jffs2_do_mount_fs+0x745/0x2120 [<ffffffff86149fec>] jffs2_do_fill_super+0x35c/0x810 [<ffffffff8614aae9>] jffs2_fill_super+0x2b9/0x3b0 […] unreferenced object 0xffff8881bd7f0000 (size 65536): comm "mount", pid 710, jiffies 4302851558 (age 58.239s) hex dump (first 32 bytes): bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ……………. bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb bb ……………. backtrace: [<ffffffff858579ba>] kmalloc_order+0xda/0x110 [<ffffffff85857a11>] kmalloc_order_trace+0x21/0x130 [<ffffffff859c2ed1>] __kmalloc+0x711/0x8a0 [<ffffffff86160189>] jffs2_sum_init+0xd9/0x1a0 [<ffffffff86140e25>] jffs2_do_mount_fs+0x745/0x2120 [<ffffffff86149fec>] jffs2_do_fill_super+0x35c/0x810 [<ffffffff8614aae9>] jffs2_fill_super+0x2b9/0x3b0 […]

This is because the resources allocated in jffs2_sum_init() are not released. Call jffs2_sum_exit() to release these resources to solve the problem.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < 4ba7bbeab8009faf3a726e565d98816593ddd5b0affected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < 4da8763a3d2b684c773b72ed80fad40bc264bc40affected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < 28048a4cf3813b7cf5cc8cce629dfdc7951cb1c2affected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < d3a4fff1e7e408c32649030daa7c2c42a7e19a95affected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < 3252d327f977b14663a10967f3b0930d6c325687affected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < ecc53e58596542791e82eff00702f8af7a313f70affected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < cf9db013e167bc8fc2ecd7a13ed97a37df0c9dabaffected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < 69295267c481545f636b69ff341b8db75aa136b9affected
LinuxLinuxe631ddba588783edd521c5a89f7b2902772fb691 < c14adb1cf70a984ed081c67e9d27bc3caad9537caffected
LinuxLinux2.6.15affected
LinuxLinux0 < 2.6.15unaffected
LinuxLinux4.9.318 <= 4.9.*unaffected
LinuxLinux4.14.283 <= 4.14.*unaffected
LinuxLinux4.19.247 <= 4.19.*unaffected
LinuxLinux5.4.198 <= 5.4.*unaffected
LinuxLinux5.10.122 <= 5.10.*unaffected
LinuxLinux5.15.47 <= 5.15.*unaffected
LinuxLinux5.17.15 <= 5.17.*unaffected
LinuxLinux5.18.4 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References