Linux: Out-of-bounds Read
CVE-2022-50333 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 f8d4d0bac603616e2fa4a3907e81ed13f8f3c380, 0183c8f46ab5bcd0740f41c87f5141c6ca2bf1bb, 624843f1bac448150f6859999c72c4841c14a2e3 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 0.17% 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 f8d4d0bac603616e2fa4a3907e81ed13f8f3c380 or 0183c8f46ab5bcd0740f41c87f5141c6ca2bf1bb or 624843f1bac448150f6859999c72c4841c14a2e3 or 50163a115831ef4e6402db5a7ef487d1989d7249, whichever matches your release line, or a later version.
- Update Linux Kernel to 4.9.337 or 4.14.303 or 4.19.270 or 5.4.229, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, f8d4d0bac603616e2fa4a3907e81ed13f8f3c380; b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, 0183c8f46ab5bcd0740f41c87f5141c6ca2bf1bb; b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, 624843f1bac448150f6859999c72c4841c14a2e3; b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, 50163a115831ef4e6402db5a7ef487d1989d7249; b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, 911999b193735cd378517b6cd5fe585ee345d49c; b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, 10b87da8fae79c7daf5eda6a9e4f1d31b85b4d92; b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, ab5cd3d62c2493eca3337e7d0178cc7bd819ca64; b40c2e665cd552eae5fbdbb878bc29a34357668e up to, but not including, 3d340b684dcec5e34efc470227cd1c7d2df121ad; and 2 more ranges | f8d4d0bac603616e2fa4a3907e81ed13f8f3c380, 0183c8f46ab5bcd0740f41c87f5141c6ca2bf1bb, 624843f1bac448150f6859999c72c4841c14a2e3, 50163a115831ef4e6402db5a7ef487d1989d7249, 911999b193735cd378517b6cd5fe585ee345d49c, 10b87da8fae79c7daf5eda6a9e4f1d31b85b4d92 |
| Linux | Linux Kernel | before 4.9.337; 4.10 up to, but not including, 4.14.303; 4.15 up to, but not including, 4.19.270; 4.20 up to, but not including, 5.4.229; 5.5 up to, but not including, 5.10.163; 5.11 up to, but not including, 5.15.86; 5.16 up to, but not including, 6.0.16; 6.1 up to, but not including, 6.1.2 | 4.9.337, 4.14.303, 4.19.270, 5.4.229, 5.10.163, 5.15.86 |
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.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.8 | High | CNA |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
In the Linux kernel, the following vulnerability has been resolved: fs: jfs: fix shift-out-of-bounds in dbDiscardAG This should be applied to most URSAN bugs found recently by syzbot, by guarding the dbMount. As syzbot feeding rubbish into the bmap descriptor.
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.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
- git.kernel.org/stable/c/0183c8f46ab5bcd0740f41c87f5141c6ca2bf1bb
- git.kernel.org/stable/c/10b87da8fae79c7daf5eda6a9e4f1d31b85b4d92
- git.kernel.org/stable/c/25e70c6162f207828dd405b432d8f2a98dbf7082
- git.kernel.org/stable/c/3d340b684dcec5e34efc470227cd1c7d2df121ad
- git.kernel.org/stable/c/50163a115831ef4e6402db5a7ef487d1989d7249
- git.kernel.org/stable/c/624843f1bac448150f6859999c72c4841c14a2e3
- git.kernel.org/stable/c/911999b193735cd378517b6cd5fe585ee345d49c
- git.kernel.org/stable/c/ab5cd3d62c2493eca3337e7d0178cc7bd819ca64
- git.kernel.org/stable/c/f8d4d0bac603616e2fa4a3907e81ed13f8f3c380
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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