Linux: Out-of-bounds Read
CVE-2022-49031 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions 98afcb5f3be645d330c74c5194ba0d80e26f95e0, c9268df36818ee4eaaaeadc80009b442a5ca69c9, 726fa3e4ab97dcff1c745bdc4fb137366cb8d3df as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.24% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to 98afcb5f3be645d330c74c5194ba0d80e26f95e0 or c9268df36818ee4eaaaeadc80009b442a5ca69c9 or 726fa3e4ab97dcff1c745bdc4fb137366cb8d3df or 2d6a437064ffbe685c67ddb16dfc0946074c6c3f, whichever matches your release line, or a later version.
- Update Linux Kernel to 4.9.335 or 4.14.301 or 4.19.268 or 5.4.226, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | b36e8257641a043764c62240316610c81e36376c up to, but not including, 98afcb5f3be645d330c74c5194ba0d80e26f95e0; b36e8257641a043764c62240316610c81e36376c up to, but not including, c9268df36818ee4eaaaeadc80009b442a5ca69c9; b36e8257641a043764c62240316610c81e36376c up to, but not including, 726fa3e4ab97dcff1c745bdc4fb137366cb8d3df; b36e8257641a043764c62240316610c81e36376c up to, but not including, 2d6a437064ffbe685c67ddb16dfc0946074c6c3f; b36e8257641a043764c62240316610c81e36376c up to, but not including, b1756af172fb80a3edc143772d49e166ec691b6c; b36e8257641a043764c62240316610c81e36376c up to, but not including, e7e76a77aabef8989cbc0a8417af1aa040620867; b36e8257641a043764c62240316610c81e36376c up to, but not including, 06c6ce21cec77dfa860d57e7a006000a57812efb; b36e8257641a043764c62240316610c81e36376c up to, but not including, 58143c1ed5882c138a3cd2251a336fc8755f23d9; and 1 more ranges | 98afcb5f3be645d330c74c5194ba0d80e26f95e0, c9268df36818ee4eaaaeadc80009b442a5ca69c9, 726fa3e4ab97dcff1c745bdc4fb137366cb8d3df, 2d6a437064ffbe685c67ddb16dfc0946074c6c3f, b1756af172fb80a3edc143772d49e166ec691b6c, e7e76a77aabef8989cbc0a8417af1aa040620867 |
| Linux | Linux Kernel | 4.8 up to, but not including, 4.9.335; 4.10 up to, but not including, 4.14.301; 4.15 up to, but not including, 4.19.268; 4.20 up to, but not including, 5.4.226; 5.5 up to, but not including, 5.10.158; 5.11 up to, but not including, 5.15.82; 5.16 up to, but not including, 6.0.12; 6.1 | 4.9.335, 4.14.301, 4.19.268, 5.4.226, 5.10.158, 5.15.82 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.
Official description
In the Linux kernel, the following vulnerability has been resolved: iio: health: afe4403: Fix oob read in afe4403_read_raw KASAN report out-of-bounds read as follows: BUG: KASAN: global-out-of-bounds in afe4403_read_raw+0x42e/0x4c0 Read of size 4 at addr ffffffffc02ac638 by task cat/279 Call Trace: afe4403_read_raw iio_read_channel_info dev_attr_show The buggy address belongs to the variable: afe4403_channel_leds+0x18/0xffffffffffffe9e0 This issue can be reproduced by singe command: $ cat /sys/bus/spi/devices/spi0.0/iio\:device0/in_intensity6_raw The array size of afe4403_channel_leds is less than channels, so access with chan->address cause OOB read in afe4403_read_raw. Fix it by moving access before use it.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/06c6ce21cec77dfa860d57e7a006000a57812efb
- git.kernel.org/stable/c/2d6a437064ffbe685c67ddb16dfc0946074c6c3f
- git.kernel.org/stable/c/58143c1ed5882c138a3cd2251a336fc8755f23d9
- git.kernel.org/stable/c/726fa3e4ab97dcff1c745bdc4fb137366cb8d3df
- git.kernel.org/stable/c/98afcb5f3be645d330c74c5194ba0d80e26f95e0
- git.kernel.org/stable/c/b1756af172fb80a3edc143772d49e166ec691b6c
- git.kernel.org/stable/c/c9268df36818ee4eaaaeadc80009b442a5ca69c9
- git.kernel.org/stable/c/e7e76a77aabef8989cbc0a8417af1aa040620867
Recent Out-of-bounds Read vulnerabilities
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
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