md/bitmap: fix GPF in write_page caused by resize race

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Summary

CVECVE-2026-43163
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:34 UTC
Updated2026-05-13 21:19:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: md/bitmap: fix GPF in write_page caused by resize race A General Protection Fault occurs in write_page() during array resize: RIP: 0010:write_page+0x22b/0x3c0 [md_mod] This is a use-after-free race between bitmap_daemon_work() and __bitmap_resize(). The daemon iterates over `bitmap->storage.filemap` without locking, while the resize path frees that storage via md_bitmap_file_unmap(). `quiesce()` does not stop the md thread, allowing concurrent access to freed pages. Fix by holding `mddev->bitmap_info.mutex` during the bitmap update.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

Problem Types: CWE-362

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:H/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 d60b479d177a5735b6b4db6ee5280ef6653f50e7 140cc839fbeb1ddb33a8da8811b716d88d3905b7 git Not specified
CNA Linux Linux affected d60b479d177a5735b6b4db6ee5280ef6653f50e7 ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8 git Not specified
CNA Linux Linux affected d60b479d177a5735b6b4db6ee5280ef6653f50e7 d3af62411e19752c663fe4f424dbf49d95a4cc7c git Not specified
CNA Linux Linux affected d60b479d177a5735b6b4db6ee5280ef6653f50e7 d92b8fac294b5f915c50e65ce4ae2262e53614ec git Not specified
CNA Linux Linux affected d60b479d177a5735b6b4db6ee5280ef6653f50e7 a437e3bf30e32846079e470c1ba5ee790bccdf89 git Not specified
CNA Linux Linux affected d60b479d177a5735b6b4db6ee5280ef6653f50e7 9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f git Not specified
CNA Linux Linux affected d60b479d177a5735b6b4db6ee5280ef6653f50e7 5f73c8b33df9a605a591eab72d43a969600c1f8c git Not specified
CNA Linux Linux affected d60b479d177a5735b6b4db6ee5280ef6653f50e7 46ef85f854dfa9d5226b3c1c46493d79556c9589 git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a437e3bf30e32846079e470c1ba5ee790bccdf89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ebcacc7ca22d5e8a03a970f0621ae1d1356b9ae8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/46ef85f854dfa9d5226b3c1c46493d79556c9589 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d92b8fac294b5f915c50e65ce4ae2262e53614ec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/140cc839fbeb1ddb33a8da8811b716d88d3905b7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d3af62411e19752c663fe4f424dbf49d95a4cc7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9a6f8cd28bb9bb6ed86a6df19331fb08016dee7f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5f73c8b33df9a605a591eab72d43a969600c1f8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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