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CVE-2026-31689— EDAC/mc: Fix error path ordering in edac_mc_alloc()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于EDAC/mc组件中edac_mc_alloc函数错误路径顺序问题，可能导致设备未初始化时调用kobject_put。

AI Predicted 3.3 Difficulty: Theoretical EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1001 · Data Obfuscation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 0bbb265f7089584aaa6d440805ca75ea4f3930d4< aae95970fad2127a1bd49d8713c7cd0677dcd2d6 affected
0bbb265f7089584aaa6d440805ca75ea4f3930d4< d3de72e2a2b9ee3a57734c1c068823e41a707715 affected
0bbb265f7089584aaa6d440805ca75ea4f3930d4< d20e98c2df9354cc744431ad8ccbf49405b8b40f affected
0bbb265f7089584aaa6d440805ca75ea4f3930d4< 87ce8ae511962e105bcb3534944208c6a9471ed9 affected
0bbb265f7089584aaa6d440805ca75ea4f3930d4< 75825648ce984ca4cebb28e4bd2bf8c3a7e837c5 affected
0bbb265f7089584aaa6d440805ca75ea4f3930d4< 51520e03e70d6c73e33ee7cbe0319767d05764fe affected
5.19 affected
< 5.19 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-31689

Vulnerability Information
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Vulnerability Title
EDAC/mc: Fix error path ordering in edac_mc_alloc()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于EDAC/mc组件中edac_mc_alloc函数错误路径顺序问题，可能导致设备未初始化时调用kobject_put。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0bbb265f7089584aaa6d440805ca75ea4f3930d4 ~ aae95970fad2127a1bd49d8713c7cd0677dcd2d6 -
Linux Linux 5.19 -

II. Public POCs for CVE-2026-31689

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III. Intelligence Information for CVE-2026-31689

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Patches & Fixes for CVE-2026-31689 (6)

Same Patch Batch · Linux · 2026-04-27 · 5 CVEs total

CVE-2026-31686 mm/kasan: fix double free for kasan pXds
CVE-2026-31687 gpio: omap: do not register driver in probe()
CVE-2026-31690 firmware: thead: Fix buffer overflow and use standard endian macros
CVE-2026-31691 igb: remove napi_synchronize() in igb_down()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31689

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