bpf: avoid holding freeze_mutex during mmap operation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-21853
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-03-12 10:15:18 UTC
Updated2026-07-14 13:17:24 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: avoid holding freeze_mutex during mmap operation We use map->freeze_mutex to prevent races between map_freeze() and memory mapping BPF map contents with writable permissions. The way we naively do this means we'll hold freeze_mutex for entire duration of all the mm and VMA manipulations, which is completely unnecessary. This can potentially also lead to deadlocks, as reported by syzbot in [0]. So, instead, hold freeze_mutex only during writeability checks, bump (proactively) "write active" count for the map, unlock the mutex and proceed with mmap logic. And only if something went wrong during mmap logic, then undo that "write active" counter increment. [0] https://lore.kernel.org/bpf/[email protected]/

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

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 fc9702273e2edb90400a34b3be76f7b08fa3344b 2ce31c97c219b4fe797749f950274f246eb88c49 git Not specified
CNA Linux Linux affected fc9702273e2edb90400a34b3be76f7b08fa3344b 0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f git Not specified
CNA Linux Linux affected fc9702273e2edb90400a34b3be76f7b08fa3344b 4759acbd44d24a69b7b14848012ec4201d6c5501 git Not specified
CNA Linux Linux affected fc9702273e2edb90400a34b3be76f7b08fa3344b 29cfda62ab4d92ab94123813db49ab76c1e61b29 git Not specified
CNA Linux Linux affected fc9702273e2edb90400a34b3be76f7b08fa3344b d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4 git Not specified
CNA Linux Linux affected fc9702273e2edb90400a34b3be76f7b08fa3344b 271e49f8a58edba65bc2b1250a0abaa98c4bfdbe git Not specified
CNA Linux Linux affected fc9702273e2edb90400a34b3be76f7b08fa3344b bc27c52eea189e8f7492d40739b7746d67b65beb git Not specified
CNA Linux Linux affected 5.5 Not specified
CNA Linux Linux unaffected 5.5 semver Not specified
CNA Linux Linux unaffected 5.10.237 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.181 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.135 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.80 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.17 6.12.* semver Not specified
CNA Linux Linux unaffected 6.13.5 6.13.* semver Not specified
CNA Linux Linux unaffected 6.14 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2025/05/msg00030.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/2ce31c97c219b4fe797749f950274f246eb88c49 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0d90d9e154144a3a80e9fc0eb9b21b7fc990f68f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/271e49f8a58edba65bc2b1250a0abaa98c4bfdbe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d95607a5f2f9bb08194c9deaf4a5f3e8ba59a9d4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/4759acbd44d24a69b7b14848012ec4201d6c5501 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/bc27c52eea189e8f7492d40739b7746d67b65beb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/05/msg00045.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/29cfda62ab4d92ab94123813db49ab76c1e61b29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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