CVE-2025-21851

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Source
https://cve.org/CVERecord?id=CVE-2025-21851
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21851.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21851
Downstream
Related
Published
2025-03-12T09:42:06.480Z
Modified
2026-05-15T11:53:40.813473376Z
Severity
  • 3.3 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
bpf: Fix softlockup in arena_map_free on 64k page kernel
Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix softlockup in arenamapfree on 64k page kernel

On an aarch64 kernel with CONFIGPAGESIZE64KB=y, arenahtab tests cause a segmentation fault and soft lockup. The same failure is not observed with 4k pages on aarch64.

It turns out arenamapfree() is calling applytoexistingpagerange() with the address returned by bpfarenagetkernvmstart(). If this address is not page-aligned the code ends up calling applytopterange() with that unaligned address causing soft lockup.

Fix it by round up GUARDSZ to PAGESIZE << 1 so that the division by 2 in bpfarenagetkernvm_start() returns a page-aligned value.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21851.json"
}
References

Affected packages

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
6.9.0
Fixed
6.12.17
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.13.5

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21851.json"