Linux Kernel EDAC: Wrong Init Order in edac_mc_alloc Crash
CVE-2026-31689 Published on April 27, 2026
EDAC/mc: Fix error path ordering in edac_mc_alloc()
In 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.
Products Associated with CVE-2026-31689
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Affected Versions
Linux:- Version 0bbb265f7089584aaa6d440805ca75ea4f3930d4 and below aae95970fad2127a1bd49d8713c7cd0677dcd2d6 is affected.
- Version 0bbb265f7089584aaa6d440805ca75ea4f3930d4 and below d3de72e2a2b9ee3a57734c1c068823e41a707715 is affected.
- Version 0bbb265f7089584aaa6d440805ca75ea4f3930d4 and below d20e98c2df9354cc744431ad8ccbf49405b8b40f is affected.
- Version 0bbb265f7089584aaa6d440805ca75ea4f3930d4 and below 87ce8ae511962e105bcb3534944208c6a9471ed9 is affected.
- Version 0bbb265f7089584aaa6d440805ca75ea4f3930d4 and below 75825648ce984ca4cebb28e4bd2bf8c3a7e837c5 is affected.
- Version 0bbb265f7089584aaa6d440805ca75ea4f3930d4 and below 51520e03e70d6c73e33ee7cbe0319767d05764fe is affected.
- Version 5.19 is affected.
- Before 5.19 is unaffected.
- Version 6.1.169, <= 6.1.* is unaffected.
- Version 6.6.135, <= 6.6.* is unaffected.
- Version 6.12.82, <= 6.12.* is unaffected.
- Version 6.18.23, <= 6.18.* is unaffected.
- Version 6.19.13, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.