CyberSecBulletin
CVE-2022-48837NVD status: Modified

Linux: Integer Overflow or Wraparound

Published Updated By the CyberSecBulletin desk

CVE-2022-48837 is a high-severity integer overflow or wraparound vulnerability in Linux, with a CVSS 3.1 base score of 7.8 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 8b3e4d26bc9cd0f6373d0095b9ffd99e7da8006b, c7953cf03a26876d676145ce5d2ae6d8c9630b90, 138d4f739b35dfb40438a0d5d7054965763bfbe7 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 0.26% 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 8b3e4d26bc9cd0f6373d0095b9ffd99e7da8006b or c7953cf03a26876d676145ce5d2ae6d8c9630b90 or 138d4f739b35dfb40438a0d5d7054965763bfbe7 or 21829376268397f9fd2c35cfa9135937b6aa3a1e, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 4.9.308 or 4.14.273 or 4.19.236 or 5.4.187, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxff0a90739925734c91c7e39befe3f4378e0c1369 up to, but not including, 8b3e4d26bc9cd0f6373d0095b9ffd99e7da8006b; 4c22fbcef778badb00fb8bb9f409daa29811c175 up to, but not including, c7953cf03a26876d676145ce5d2ae6d8c9630b90; db9aaa3026298d652e98f777bc0f5756e2455dda up to, but not including, 138d4f739b35dfb40438a0d5d7054965763bfbe7; c9e952871ae47af784b4aef0a77db02e557074d6 up to, but not including, 21829376268397f9fd2c35cfa9135937b6aa3a1e; fb4ff0f96de37c44236598e8b53fe43b1df36bf3 up to, but not including, 28bc0267399f42f987916a7174e2e32f0833cc65; 2da3b0ab54fb7f4d7c5a82757246d0ee33a47197 up to, but not including, 56b38e3ca4064041d93c1ca18828c8cedad2e16c; 2724ebafda0a8df08a9cb91557d33226bee80f7b up to, but not including, df7e088d51cdf78b1a0bf1f3d405c2593295c7b0; 38ea1eac7d88072bbffb630e2b3db83ca649b826 up to, but not including, 65f3324f4b6fed78b8761c3b74615ecf0ffa81fa; and 7 more ranges8b3e4d26bc9cd0f6373d0095b9ffd99e7da8006b, c7953cf03a26876d676145ce5d2ae6d8c9630b90, 138d4f739b35dfb40438a0d5d7054965763bfbe7, 21829376268397f9fd2c35cfa9135937b6aa3a1e, 28bc0267399f42f987916a7174e2e32f0833cc65, 56b38e3ca4064041d93c1ca18828c8cedad2e16c
LinuxLinux Kernel4.9.302 up to, but not including, 4.9.308; 4.14.267 up to, but not including, 4.14.273; 4.19.230 up to, but not including, 4.19.236; 5.4.180 up to, but not including, 5.4.187; 5.10.101 up to, but not including, 5.10.108; 5.15.24 up to, but not including, 5.15.31; 5.16.10 up to, but not including, 5.16.174.9.308, 4.14.273, 4.19.236, 5.4.187, 5.10.108, 5.15.31

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
HighData or code can be modified at will.
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:H/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: rndis: prevent integer overflow in rndis_set_response() If "BufOffset" is very large the "BufOffset + 8" operation can have an integer overflow.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

How developers prevent this class of flaw

  • Ensure that all protocols are strictly defined, such that all out-of-bounds behavior can be identified simply, and require strict conformance to the protocol.
  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. Use libraries or frameworks that make it easier to handle numbers without unexpected consequences. Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++).

More Integer Overflow or Wraparound vulnerabilities (CWE-190)

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 Integer Overflow or Wraparound vulnerabilities

Spotted an error? Tell us.