CVE-2026-43264

Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: of: display_timing: fix refcount leak in of_get_display_timings() of_parse_phandle() returns a device_node with refcount incremented, which is stored in 'entry' and then copied to 'native_mode'. When the error paths at lines 184 or 192 jump to 'entryfail', native_mode's refcount is not decremented, causing a refcount leak. Fix this by changing the goto target from 'entryfail' to 'timingfail', which properly calls of_node_put(native_mode) before cleanup.

CVSS Details

CVSS Score

5.5

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux Kernel < 6.6 (具体受影响版本请参考各发行版公告)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

/*
 * PoC Concept for CVE-2026-43264
 * This module demonstrates the logic to trigger the refcount leak.
 * Requires a system with the vulnerable kernel and appropriate hardware/DTB.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/of.h>

static int __init poc_init(void)
{
    struct device_node *np;
    
    printk(KERN_INFO "CVE-2026-43264 PoC: Initializing...\n");
    
    // In a real scenario, we would trigger the fbdev driver initialization
    // with a malformed device tree that forces the error path.
    // e.g., calling of_get_display_timings with a node that has
    // partial display-timing data causing a jump to 'entryfail'.
    
    // Since the function is static/internal, we rely on hardware trigger.
    // This logs the intent to monitor kmemleak.
    printk(KERN_INFO "Check dmesg for 'unreferenced object' warnings if kmemleak is enabled.\n");
    
    return 0;
}

static void __exit poc_exit(void)
{
    printk(KERN_INFO "CVE-2026-43264 PoC: Exiting...\n");
}

module_init(poc_init);
module_exit(poc_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PoC for CVE-2026-43264 Refcount Leak");

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43264
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43264
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43264/
[4] VulDB https://vuldb.com/cve/CVE-2026-43264
[5] https://git.kernel.org/stable/c/20881ad42e651c69d89eb38a2042838187900fd6
[6] https://git.kernel.org/stable/c/2b22e4fe1273c24f405ed7903349c4bbd82b6368
[7] https://git.kernel.org/stable/c/3ed019654234edb8625c05d05e15d40f74e64f70
[8] https://git.kernel.org/stable/c/69290f2d3999c5fa1a7f5d5593cfc5461fa3ee64
[9] https://git.kernel.org/stable/c/b5bdcc5afbff845834d04d651773cb6b47db5dd3
[10] https://git.kernel.org/stable/c/c5734f9030a8b1e13868d1641b5163d8e659306e
[11] https://git.kernel.org/stable/c/d6f34bbff07476c6abb8672c89d217824871c5ed
[12] https://git.kernel.org/stable/c/eacf9840ae1285a1ef47eb0ce16d786e542bd4d7

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43264", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:47.373", "lastModified": "2026-05-08T20:33:27.567", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: of: display_timing: fix refcount leak in of_get_display_timings()\n\nof_parse_phandle() returns a device_node with refcount incremented,\nwhich is stored in 'entry' and then copied to 'native_mode'. When the\nerror paths at lines 184 or 192 jump to 'entryfail', native_mode's\nrefcount is not decremented, causing a refcount leak.\n\nFix this by changing the goto target from 'entryfail' to 'timingfail',\nwhich properly calls of_node_put(native_mode) before cleanup."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "NVD-CWE-Other"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.9", "versionEndExcluding": "5.10.252", "matchCriteriaId": "DAC8F37C-5CCE-4EA4-9EC8-BF9786762E85"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.202", "matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.165", "matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.128", "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.75", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/20881ad42e651c69d89eb38a2042838187900fd6", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/2b22e4fe1273c24f405ed7903349c4bbd82b6368", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/3ed019654234edb8625c05d05e15d40f74e64f70", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/69290f2d3999c5fa1a7f5d5593cfc5461fa3ee64", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b5bdcc5afbff845834d04d651773cb6b47db5dd3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/c5734f9030a8b1e13868d1641b5163d8e659306e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/d6f34bbff07476c6abb8672c89d217824871c5ed", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/eacf9840ae1285a1ef47eb0ce16d786e542bd4d7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}