EDAC/mc: Fix error path ordering in edac_mc_alloc()

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Summary

CVECVE-2026-31689
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-27 18:16:54 UTC
Updated2026-05-06 18:33:39 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: EDAC/mc: Fix error path ordering in edac_mc_alloc() When the mci->pvt_info allocation in edac_mc_alloc() fails, the error path will call put_device() which will end up calling the device's release function. However, the init ordering is wrong such that device_initialize() happens *after* the failed allocation and thus the device itself and the release function pointer are not initialized yet when they're called: MCE: In-kernel MCE decoding enabled. ------------[ cut here ]------------ kobject: '(null)': is not initialized, yet kobject_put() is being called. WARNING: lib/kobject.c:734 at kobject_put, CPU#22: systemd-udevd CPU: 22 UID: 0 PID: 538 Comm: systemd-udevd Not tainted 7.0.0-rc1+ #2 PREEMPT(full) RIP: 0010:kobject_put Call Trace: <TASK> edac_mc_alloc+0xbe/0xe0 [edac_core] amd64_edac_init+0x7a4/0xff0 [amd64_edac] ? __pfx_amd64_edac_init+0x10/0x10 [amd64_edac] do_one_initcall ... Reorder the calling sequence so that the device is initialized and thus the release function pointer is properly set before it can be used. This was found by Claude while reviewing another EDAC patch.

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: CWE-476

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 0bbb265f7089584aaa6d440805ca75ea4f3930d4 aae95970fad2127a1bd49d8713c7cd0677dcd2d6 git Not specified
CNA Linux Linux affected 0bbb265f7089584aaa6d440805ca75ea4f3930d4 d3de72e2a2b9ee3a57734c1c068823e41a707715 git Not specified
CNA Linux Linux affected 0bbb265f7089584aaa6d440805ca75ea4f3930d4 d20e98c2df9354cc744431ad8ccbf49405b8b40f git Not specified
CNA Linux Linux affected 0bbb265f7089584aaa6d440805ca75ea4f3930d4 87ce8ae511962e105bcb3534944208c6a9471ed9 git Not specified
CNA Linux Linux affected 0bbb265f7089584aaa6d440805ca75ea4f3930d4 75825648ce984ca4cebb28e4bd2bf8c3a7e837c5 git Not specified
CNA Linux Linux affected 0bbb265f7089584aaa6d440805ca75ea4f3930d4 51520e03e70d6c73e33ee7cbe0319767d05764fe git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/aae95970fad2127a1bd49d8713c7cd0677dcd2d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/75825648ce984ca4cebb28e4bd2bf8c3a7e837c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/51520e03e70d6c73e33ee7cbe0319767d05764fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d20e98c2df9354cc744431ad8ccbf49405b8b40f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/d3de72e2a2b9ee3a57734c1c068823e41a707715 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/87ce8ae511962e105bcb3534944208c6a9471ed9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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