CVE-2026-43461

Description

In the Linux kernel, the following vulnerability has been resolved: spi: amlogic: spifc-a4: Fix DMA mapping error handling Fix three bugs in aml_sfc_dma_buffer_setup() error paths: 1. Unnecessary goto: When the first DMA mapping (sfc->daddr) fails, nothing needs cleanup. Use direct return instead of goto. 2. Double-unmap bug: When info DMA mapping failed, the code would unmap sfc->daddr inline, then fall through to out_map_data which would unmap it again, causing a double-unmap. 3. Wrong unmap size: The out_map_info label used datalen instead of infolen when unmapping sfc->iaddr, which could lead to incorrect DMA sync behavior.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Linux Kernel (修复前的特定版本)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC for CVE-2026-43461: Linux Kernel Amlogic SPIFC DMA mapping bug
 * This is a conceptual stub to demonstrate triggering the error path.
 * Requires a vulnerable kernel version and specific hardware (Amlogic A4).
 */

#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/dma-mapping.h>

static int __init poc_init(void) {
    struct spi_device *spi;
    struct spi_transfer *xfer;
    // In a real scenario, logic to find the spifc-a4 device is needed.
    // The goal is to force a DMA setup failure, specifically the second mapping (info).
    
    printk(KERN_INFO "Attempting to trigger CVE-2026-43461\n");
    
    // Hypothetical trigger: Force allocation failure or invalid address mapping
    // to hit the `out_map_info` error path.
    
    return 0;
}

static void __exit poc_exit(void) {
    printk(KERN_INFO "PoC unloaded\n");
}

module_init(poc_init);
module_exit(poc_exit);
MODULE_LICENSE("GPL");

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43461
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43461
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43461/
[4] VulDB https://vuldb.com/cve/CVE-2026-43461
[5] https://git.kernel.org/stable/c/0a83d6c9e149a176340190fa9cbadf2266db4c9a
[6] https://git.kernel.org/stable/c/b20b437666e1cb26a7c499d1664e8f2a0ac67000
[7] https://git.kernel.org/stable/c/c0b88f1176074f80140ed77fce909f254b7180ab

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-43461", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T15:16:58.977", "lastModified": "2026-05-11T08:16:15.247", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: amlogic: spifc-a4: Fix DMA mapping error handling\n\nFix three bugs in aml_sfc_dma_buffer_setup() error paths:\n1. Unnecessary goto: When the first DMA mapping (sfc->daddr) fails,\n   nothing needs cleanup. Use direct return instead of goto.\n2. Double-unmap bug: When info DMA mapping failed, the code would\n   unmap sfc->daddr inline, then fall through to out_map_data which\n   would unmap it again, causing a double-unmap.\n3. Wrong unmap size: The out_map_info label used datalen instead of\n   infolen when unmapping sfc->iaddr, which could lead to incorrect\n   DMA sync behavior."}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "references": [{"url": "https://git.kernel.org/stable/c/0a83d6c9e149a176340190fa9cbadf2266db4c9a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b20b437666e1cb26a7c499d1664e8f2a0ac67000", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/c0b88f1176074f80140ed77fce909f254b7180ab", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}]}}