CVE-2022-49307

Summary

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

tty: synclink_gt: Fix null-pointer-dereference in slgt_clean()

When the driver fails at alloc_hdlcdev(), and then we remove the driver module, we will get the following splat:

[ 25.065966] general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN PTI [ 25.066914] KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] [ 25.069262] RIP: 0010:detach_hdlc_protocol+0x2a/0x3e0 [ 25.077709] Call Trace: [ 25.077924] <TASK> [ 25.078108] unregister_hdlc_device+0x16/0x30 [ 25.078481] slgt_cleanup+0x157/0x9f0 [synclink_gt]

Fix this by checking whether the 'info->netdev' is a null pointer first.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0daffected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < 078212ad15dbd88840c82c97f12c93d83703c8fdaffected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < ba08cbc5b53e151d0acf1930fb526fc65b7f3e65affected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < f6e07eb7ebec53ffe81fc2489589320fbe4a6b75affected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < d68d5e68b7f64de7170f8e04dd9b995c36b2c71caffected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < 8a95696bdc0e13f8980f05b54a3b9081963d1256affected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < ddd67751ab86c6a65f95c35293c42f85a42ac05daffected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < 1ceb4ca9543a8a788febf6bc8dad2e605e172d5eaffected
LinuxLinux705b6c7b34f2621f95f606d0e683daa10cdb8eb9 < 689ca31c542687709ba21ec2195c1fbce34fd029affected
LinuxLinux2.6.16affected
LinuxLinux0 < 2.6.16unaffected
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