CyberSecBulletin
CVE-2026-53133NVD status: Modified

Linux: Incorrect Conversion between Numeric Types

Published Updated By the CyberSecBulletin desk

CVE-2026-53133 is a high-severity incorrect conversion between numeric types 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 2ff4b7817e5b78070c30f5fb5e678e452a2628b3, dee2a49adeeb2a5e16a3fc858fa21b841c519802, cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f 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 0.13% 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 2ff4b7817e5b78070c30f5fb5e678e452a2628b3 or dee2a49adeeb2a5e16a3fc858fa21b841c519802 or cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f or 8fe0231adebe086c8a459c790944ac026cd99c6e, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 5.10.259 or 5.15.210 or 6.1.176 or 6.6.143, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinuxa808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, 2ff4b7817e5b78070c30f5fb5e678e452a2628b3; a808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, dee2a49adeeb2a5e16a3fc858fa21b841c519802; a808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f; a808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, 8fe0231adebe086c8a459c790944ac026cd99c6e; a808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, baf8685bcf56dc1efb44b8f6a57c42516e549068; a808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, afd35fec9297195b759078745549c2671223f24f; a808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, ac1aad8e1281534ce936c250f68084fc79c5469e; a808273a495c657e33281b181fd7fcc2bb28f662 up to, but not including, 15fe76e23615f502d051ef0768f86babaf08746c; and 1 more ranges2ff4b7817e5b78070c30f5fb5e678e452a2628b3, dee2a49adeeb2a5e16a3fc858fa21b841c519802, cc644d5608e3b0dadc970bd6e6aa26b91ea07d0f, 8fe0231adebe086c8a459c790944ac026cd99c6e, baf8685bcf56dc1efb44b8f6a57c42516e549068, afd35fec9297195b759078745549c2671223f24f
LinuxLinux Kernel5.2 up to, but not including, 5.10.259; 5.11 up to, but not including, 5.15.210; 5.16 up to, but not including, 6.1.176; 6.2 up to, but not including, 6.6.143; 6.7 up to, but not including, 6.12.94; 6.13 up to, but not including, 6.18.36; 6.19 up to, but not including, 7.0.13; 7.15.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36

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 CNA.

Official description

In the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Fix truncation for block sizes >= 4G When the iommu is used the linearization of the mapping can give a single block that is very large split across multiple SG entries. When __rdma_block_iter_next() reassembles the split SG entries it is overflowing the 32 bit stack values and computed the wrong DMA addresses for blocks after the truncation. Use the right types to hold DMA addresses.

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

The underlying weakness: Incorrect Conversion between Numeric Types

When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur.

How developers prevent this class of flaw

  • Avoid making conversion between numeric types. Always check for the allowed ranges.

More Incorrect Conversion between Numeric Types vulnerabilities (CWE-681)

Timeline

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

References

Recent Incorrect Conversion between Numeric Types vulnerabilities

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