crypto: qcom-rng - ensure buffer for generate is completely filled

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2022-48629
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-03-05 12:15:45 UTC
Updated2026-08-04 10:17:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: crypto: qcom-rng - ensure buffer for generate is completely filled The generate function in struct rng_alg expects that the destination buffer is completely filled if the function returns 0. qcom_rng_read() can run into a situation where the buffer is partially filled with randomness and the remaining part of the buffer is zeroed since qcom_rng_generate() doesn't check the return value. This issue can be reproduced by running the following from libkcapi: kcapi-rng -b 9000000 > OUTFILE The generated OUTFILE will have three huge sections that contain all zeros, and this is caused by the code where the test 'val & PRNG_STATUS_DATA_AVAIL' fails. Let's fix this issue by ensuring that qcom_rng_read() always returns with a full buffer if the function returns success. Let's also have qcom_rng_generate() return the correct value. Here's some statistics from the ent project (https://www.fourmilab.ch/random/) that shows information about the quality of the generated numbers: $ ent -c qcom-random-before Value Char Occurrences Fraction 0 606748 0.067416 1 33104 0.003678 2 33001 0.003667 ... 253 � 32883 0.003654 254 � 33035 0.003671 255 � 33239 0.003693 Total: 9000000 1.000000 Entropy = 7.811590 bits per byte. Optimum compression would reduce the size of this 9000000 byte file by 2 percent. Chi square distribution for 9000000 samples is 9329962.81, and randomly would exceed this value less than 0.01 percent of the times. Arithmetic mean value of data bytes is 119.3731 (127.5 = random). Monte Carlo value for Pi is 3.197293333 (error 1.77 percent). Serial correlation coefficient is 0.159130 (totally uncorrelated = 0.0). Without this patch, the results of the chi-square test is 0.01%, and the numbers are certainly not random according to ent's project page. The results improve with this patch: $ ent -c qcom-random-after Value Char Occurrences Fraction 0 35432 0.003937 1 35127 0.003903 2 35424 0.003936 ... 253 � 35201 0.003911 254 � 34835 0.003871 255 � 35368 0.003930 Total: 9000000 1.000000 Entropy = 7.999979 bits per byte. Optimum compression would reduce the size of this 9000000 byte file by 0 percent. Chi square distribution for 9000000 samples is 258.77, and randomly would exceed this value 42.24 percent of the times. Arithmetic mean value of data bytes is 127.5006 (127.5 = random). Monte Carlo value for Pi is 3.141277333 (error 0.01 percent). Serial correlation coefficient is 0.000468 (totally uncorrelated = 0.0). This change was tested on a Nexus 5 phone (msm8974 SoC).

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ceec5f5b59882b871a722ca4d49b767a09a4bde9 a8e32bbb96c25b7ab29b1894dcd45e0b3b08fd9d git Not specified
CNA Linux Linux affected ceec5f5b59882b871a722ca4d49b767a09a4bde9 184f7bd08ce56f003530fc19f160d54e75bf5c9d git Not specified
CNA Linux Linux affected ceec5f5b59882b871a722ca4d49b767a09a4bde9 0f9b7b8df17525e464294c916acc8194ce38446b git Not specified
CNA Linux Linux affected ceec5f5b59882b871a722ca4d49b767a09a4bde9 ab9337c7cb6f875b6286440b1adfbeeef2b2b2bd git Not specified
CNA Linux Linux affected ceec5f5b59882b871a722ca4d49b767a09a4bde9 485995cbc98a4f77cfd4f8ed4dd7ff8ab262964d git Not specified
CNA Linux Linux affected ceec5f5b59882b871a722ca4d49b767a09a4bde9 a680b1832ced3b5fa7c93484248fd221ea0d614b git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 4.19.236 4.19.* semver Not specified
CNA Linux Linux unaffected 5.4.187 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.108 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.31 5.15.* semver Not specified
CNA Linux Linux unaffected 5.16.17 5.16.* semver Not specified
CNA Linux Linux unaffected 5.17 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/184f7bd08ce56f003530fc19f160d54e75bf5c9d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Exploit, Mailing List, Patch
git.kernel.org/stable/c/ab9337c7cb6f875b6286440b1adfbeeef2b2b2bd af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Exploit, Mailing List, Patch
git.kernel.org/stable/c/a680b1832ced3b5fa7c93484248fd221ea0d614b af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Exploit, Mailing List, Patch
git.kernel.org/stable/c/0f9b7b8df17525e464294c916acc8194ce38446b af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Exploit, Mailing List, Patch
git.kernel.org/stable/c/a8e32bbb96c25b7ab29b1894dcd45e0b3b08fd9d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Exploit, Mailing List, Patch
git.kernel.org/stable/c/485995cbc98a4f77cfd4f8ed4dd7ff8ab262964d af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Exploit, Mailing List, Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report