CVE-2022-50099

In the function arkfbsetpar(), the value of 'screensize' is calculated by the user input. If the user provides the improper value, the value of 'screensize' may larger than 'info->screen_size', which may cause the following bug:

[ 659.399066] BUG: unable to handle page fault for address: ffffc90003000000 [ 659.399077] #PF: supervisor write access in kernel mode [ 659.399079] #PF: errorcode(0x0002) - not-present page [ 659.399094] RIP: 0010:memsetorig+0x33/0xb0 [ 659.399116] Call Trace: [ 659.399122] arkfbsetpar+0x143f/0x24c0 [ 659.399130] fbsetvar+0x604/0xeb0 [ 659.399161] dofbioctl+0x234/0x670 [ 659.399189] fb_ioctl+0xdd/0x130

Fix the this by checking the value of 'screensize' before memsetio().

References

Affected packages

Debian:11 / linux

Package

Name: linux
Purl: pkg:deb/debian/linux?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

5.10.140-1

Affected versions

5.*

5.10.46-4

5.10.46-5

5.10.70-1~bpo10+1

5.10.70-1

5.10.84-1

5.10.92-1~bpo10+1

5.10.92-1

5.10.92-2

5.10.103-1~bpo10+1

5.10.103-1

5.10.106-1

5.10.113-1

5.10.120-1~bpo10+1

5.10.120-1

5.10.127-1

5.10.127-2~bpo10+1

5.10.127-2

5.10.136-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name: linux
Purl: pkg:deb/debian/linux?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

6.0.2-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name: linux
Purl: pkg:deb/debian/linux?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

6.0.2-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}