Linux: Out-of-bounds Read
CVE-2022-49503 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 0bcb528402cd5e1a6e1833e956fd58a12d509e8e, a048e0c3caa852397b7b50d4c82a0415c05f7ac3, 4bdcf32c965c27f55ccc4ee71c1927131115b0bb 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 0.28% 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 0bcb528402cd5e1a6e1833e956fd58a12d509e8e or a048e0c3caa852397b7b50d4c82a0415c05f7ac3 or 4bdcf32c965c27f55ccc4ee71c1927131115b0bb or 2326d398ccd41ba6d93b8346532dfa432ab00fee, whichever matches your release line, or a later version.
- Update Linux Kernel to 4.9.318 or 4.14.283 or 4.19.247 or 5.4.198, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, 0bcb528402cd5e1a6e1833e956fd58a12d509e8e; 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, a048e0c3caa852397b7b50d4c82a0415c05f7ac3; 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, 4bdcf32c965c27f55ccc4ee71c1927131115b0bb; 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, 2326d398ccd41ba6d93b8346532dfa432ab00fee; 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, 461e4c1f199076275f16bf6f3d3e42c6b6c79f33; 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, 7f6defe0fabc79f29603c6fa3c80e4fe0456a3e9; 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, eda518db7db16c360bc84379d90675650daa3048; 4ed1a8d4a25711f780b96920fff2bb531229e322 up to, but not including, 3dad3fed5672828c7fb0465cb66a3d9a70952fa6; and 2 more ranges | 0bcb528402cd5e1a6e1833e956fd58a12d509e8e, a048e0c3caa852397b7b50d4c82a0415c05f7ac3, 4bdcf32c965c27f55ccc4ee71c1927131115b0bb, 2326d398ccd41ba6d93b8346532dfa432ab00fee, 461e4c1f199076275f16bf6f3d3e42c6b6c79f33, 7f6defe0fabc79f29603c6fa3c80e4fe0456a3e9 |
| Linux | Linux Kernel | 3.15 up to, but not including, 4.9.318; 4.10 up to, but not including, 4.14.283; 4.15 up to, but not including, 4.19.247; 4.20 up to, but not including, 5.4.198; 5.5 up to, but not including, 5.10.121; 5.11 up to, but not including, 5.15.46; 5.16 up to, but not including, 5.17.14; 5.18 up to, but not including, 5.18.3 | 4.9.318, 4.14.283, 4.19.247, 5.4.198, 5.10.121, 5.15.46 |
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: ath9k_htc: fix potential out of bounds access with invalid rxstatus->rs_keyix The "rxstatus->rs_keyix" eventually gets passed to test_bit() so we need to ensure that it is within the bitmap. drivers/net/wireless/ath/ath9k/common.c:46 ath9k_cmn_rx_accept() error: passing untrusted data 'rx_stats->rs_keyix' to 'test_bit()'
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/0bcb528402cd5e1a6e1833e956fd58a12d509e8e
- git.kernel.org/stable/c/2326d398ccd41ba6d93b8346532dfa432ab00fee
- git.kernel.org/stable/c/2dc509305cf956381532792cb8dceef2b1504765
- git.kernel.org/stable/c/3dad3fed5672828c7fb0465cb66a3d9a70952fa6
- git.kernel.org/stable/c/461e4c1f199076275f16bf6f3d3e42c6b6c79f33
- git.kernel.org/stable/c/4bdcf32c965c27f55ccc4ee71c1927131115b0bb
- git.kernel.org/stable/c/7f6defe0fabc79f29603c6fa3c80e4fe0456a3e9
- git.kernel.org/stable/c/a048e0c3caa852397b7b50d4c82a0415c05f7ac3
- git.kernel.org/stable/c/eda518db7db16c360bc84379d90675650daa3048
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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