bpf: Fix DEVMAP_HASH overflow check on 32-bit arches

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2024-26885
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-04-17 11:15:10 UTC
Updated2026-05-12 12:16:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Fix DEVMAP_HASH overflow check on 32-bit arches The devmap code allocates a number hash buckets equal to the next power of two of the max_entries value provided when creating the map. When rounding up to the next power of two, the 32-bit variable storing the number of buckets can overflow, and the code checks for overflow by checking if the truncated 32-bit value is equal to 0. However, on 32-bit arches the rounding up itself can overflow mid-way through, because it ends up doing a left-shift of 32 bits on an unsigned long value. If the size of an unsigned long is four bytes, this is undefined behaviour, so there is no guarantee that we'll end up with a nice and tidy 0-value at the end. Syzbot managed to turn this into a crash on arm32 by creating a DEVMAP_HASH with max_entries > 0x80000000 and then trying to update it. Fix this by moving the overflow check to before the rounding up operation.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-119

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 6f9d451ab1a33728adb72d7ff66a7b374d665176 1f5e352b9088211fa5eb4e1639cd365f4f7d2f65 git Not specified
CNA Linux Linux affected 6f9d451ab1a33728adb72d7ff66a7b374d665176 4b81a9f92b3676cb74b907a7a209b3d15bd9a7f9 git Not specified
CNA Linux Linux affected 6f9d451ab1a33728adb72d7ff66a7b374d665176 c826502bed93970f2fd488918a7b8d5f1d30e2e3 git Not specified
CNA Linux Linux affected 6f9d451ab1a33728adb72d7ff66a7b374d665176 edf7990baa48de5097daa9ac02e06cb4c798a737 git Not specified
CNA Linux Linux affected 6f9d451ab1a33728adb72d7ff66a7b374d665176 250051acc21f9d4c5c595e4fcb55986ea08c4691 git Not specified
CNA Linux Linux affected 6f9d451ab1a33728adb72d7ff66a7b374d665176 22079b3a423382335f47d9ed32114e6c9fe88d7c git Not specified
CNA Linux Linux affected 6f9d451ab1a33728adb72d7ff66a7b374d665176 e89386f62ce9a9ab9a94835a9890883c23d9d52c git Not specified
CNA Linux Linux affected 6f9d451ab1a33728adb72d7ff66a7b374d665176 281d464a34f540de166cee74b723e97ac2515ec3 git Not specified
CNA Linux Linux affected 5.4 Not specified
CNA Linux Linux unaffected 5.4 semver Not specified
CNA Linux Linux unaffected 5.4.285 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.227 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.153 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.83 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.23 6.6.* semver Not specified
CNA Linux Linux unaffected 6.7.11 6.7.* semver Not specified
CNA Linux Linux unaffected 6.8.2 6.8.* semver Not specified
CNA Linux Linux unaffected 6.9 * original_commit_for_fix Not specified
ADP Linux Linux Kernel affected 5.4 Not specified
ADP Linux Linux Kernel affected 6f9d451ab1a3 Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e89386f62ce9a9ab9a94835a9890883c23d9d52c af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2024/06/msg00017.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/4b81a9f92b3676cb74b907a7a209b3d15bd9a7f9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c826502bed93970f2fd488918a7b8d5f1d30e2e3 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/edf7990baa48de5097daa9ac02e06cb4c798a737 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/250051acc21f9d4c5c595e4fcb55986ea08c4691 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/281d464a34f540de166cee74b723e97ac2515ec3 af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/225da02acdc97af01b6bc6ce1a3e5362bf01d3fb af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Patch
git.kernel.org/stable/c/1f5e352b9088211fa5eb4e1639cd365f4f7d2f65 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/22079b3a423382335f47d9ed32114e6c9fe88d7c af854a3a-2127-422b-91ae-364da2661108 git.kernel.org 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