CyberSecBulletin
CVE-2022-48738NVD status: Analyzed

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2022-48738 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 40f598698129b5ceaf31012f9501b775c7b6e57d, 586ef863c94354a7e00e5ae5ef01443d1dc99bc7, 65a61b1f56f5386486757930069fbdce94af08bf 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 0.23% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to 40f598698129b5ceaf31012f9501b775c7b6e57d or 586ef863c94354a7e00e5ae5ef01443d1dc99bc7 or 65a61b1f56f5386486757930069fbdce94af08bf or 68fd718724284788fc5f379e0b7cac541429ece7, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 4.9.300 or 4.14.265 or 4.19.228 or 5.4.178, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxf227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, 40f598698129b5ceaf31012f9501b775c7b6e57d; f227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, 586ef863c94354a7e00e5ae5ef01443d1dc99bc7; f227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, 65a61b1f56f5386486757930069fbdce94af08bf; f227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, 68fd718724284788fc5f379e0b7cac541429ece7; f227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, a9394f21fba027147bf275b083c77955864c366a; f227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, 9e8895f1b3d4433f6d78aa6578e9db61ca6e6830; f227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, bb72d2dda85564c66d909108ea6903937a41679d; f227b88f0fce5f9b82aa934f8829a741c2e06d82 up to, but not including, 817f7c9335ec01e0f5e8caffc4f1dcd5e458a4c0; and 1 more ranges40f598698129b5ceaf31012f9501b775c7b6e57d, 586ef863c94354a7e00e5ae5ef01443d1dc99bc7, 65a61b1f56f5386486757930069fbdce94af08bf, 68fd718724284788fc5f379e0b7cac541429ece7, a9394f21fba027147bf275b083c77955864c366a, 9e8895f1b3d4433f6d78aa6578e9db61ca6e6830
LinuxLinux Kernelbefore 4.9.300; 4.10 up to, but not including, 4.14.265; 4.15 up to, but not including, 4.19.228; 4.20 up to, but not including, 5.4.178; 5.5 up to, but not including, 5.10.99; 5.11 up to, but not including, 5.15.22; 5.16 up to, but not including, 5.16.8; 5.174.9.300, 4.14.265, 4.19.228, 5.4.178, 5.10.99, 5.15.22

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: ASoC: ops: Reject out of bounds values in snd_soc_put_volsw() We don't currently validate that the values being set are within the range we advertised to userspace as being valid, do so and reject any values that are out of range.

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.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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