CVE-2026-43397

Description

In the Linux kernel, the following vulnerability has been resolved: drm/bridge: samsung-dsim: Fix memory leak in error path In samsung_dsim_host_attach(), drm_bridge_add() is called to add the bridge. However, if samsung_dsim_register_te_irq() or pdata->host_ops->attach() fails afterwards, the function returns without removing the bridge, causing a memory leak. Fix this by adding proper error handling with goto labels to ensure drm_bridge_remove() is called in all error paths. Also ensure that samsung_dsim_unregister_te_irq() is called if the attach operation fails after the TE IRQ has been registered. samsung_dsim_unregister_te_irq() function is moved without changes to be before samsung_dsim_host_attach() to avoid forward declaration.

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

cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* - VULNERABLE

Linux Kernel < 5.10 (specific commits)

Linux Kernel < 5.15 (specific commits)

Linux Kernel < 6.1 (specific commits)

Linux Kernel < 6.6 (specific commits)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual PoC for CVE-2026-43397 Memory Leak
 * This requires a system with the vulnerable Samsung DSIM driver.
 * Repeatedly triggering the attach failure path.
 */

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

// Simulating the trigger mechanism (Actual trigger depends on hardware availability)
int init_module(void) {
    printk(KERN_INFO "Attempting to trigger CVE-2026-43397\n");
    // In a real scenario, this would involve interacting with the DRM subsystem
    // to force samsung_dsim_host_attach to fail after drm_bridge_add.
    // Example: Loading a conflicting driver or manipulating device state.
    return 0;
}

void cleanup_module(void) {
    printk(KERN_INFO "Exiting PoC\n");
}

MODULE_LICENSE("GPL");

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43397
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43397
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43397/
[4] VulDB https://vuldb.com/cve/CVE-2026-43397
[5] https://git.kernel.org/stable/c/0b07f7d2c5a4078c2f1c11bb36685084fe4e5c95
[6] https://git.kernel.org/stable/c/803ec1faf7c1823e6e3b1f2aaa81be18528c9436
[7] https://git.kernel.org/stable/c/98310fe3a2a79671b739a5344c1a11d74c503e25
[8] https://git.kernel.org/stable/c/a40b92fb4b26d4cb1b5e439e55a56db7e79a82d1
[9] https://git.kernel.org/stable/c/e6d779654cda63d632bd8dfcdcabd125057e30a5

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43397", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T15:16:51.117", "lastModified": "2026-05-21T19:30:31.447", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/bridge: samsung-dsim: Fix memory leak in error path\n\nIn samsung_dsim_host_attach(), drm_bridge_add() is called to add the\nbridge. However, if samsung_dsim_register_te_irq() or\npdata->host_ops->attach() fails afterwards, the function returns\nwithout removing the bridge, causing a memory leak.\n\nFix this by adding proper error handling with goto labels to ensure\ndrm_bridge_remove() is called in all error paths. Also ensure that\nsamsung_dsim_unregister_te_irq() is called if the attach operation\nfails after the TE IRQ has been registered.\n\nsamsung_dsim_unregister_te_irq() function is moved without changes\nto be before samsung_dsim_host_attach() to avoid forward declaration."}], "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": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.6.130", "matchCriteriaId": "B5DC2349-A344-41CA-9A54-55596F8AD981"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.78", "matchCriteriaId": "28D591F5-B196-4CC9-905C-DC80F116E7A8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.19", "matchCriteriaId": "D394AC60-6F28-435F-872A-CCDF384B8331"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.9", "matchCriteriaId": "E825E7C3-FEAC-4FD3-8A81-78D7387948C9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0b07f7d2c5a4078c2f1c11bb36685084fe4e5c95", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/803ec1faf7c1823e6e3b1f2aaa81be18528c9436", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/98310fe3a2a79671b739a5344c1a11d74c503e25", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/a40b92fb4b26d4cb1b5e439e55a56db7e79a82d1", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e6d779654cda63d632bd8dfcdcabd125057e30a5", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}