CVE-2026-43283

Description

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle dma_free_coherent() in error path takes priv->rx_buf.alloc_len as the dma handle. This would lead to improper unmapping of the buffer. Change the dma handle to priv->rx_buf.alloc_phys.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

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

Linux Kernel (所有包含漏洞代码提交之前的版本)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual PoC for CVE-2026-43283
 * This snippet demonstrates the incorrect logic found in the vulnerable driver.
 * Exploitation requires triggering the error path in the ec_bhf driver.
 */

#include <linux/dma-mapping.h>

struct vulnerable_buffer {
    void *alloc_addr;
    dma_addr_t alloc_phys;
    size_t alloc_len;
};

void vulnerable_free(struct vulnerable_buffer *buf) {
    // Vulnerable code: using alloc_len (size) as the DMA handle (phys_addr)
    dma_free_coherent(NULL, buf->alloc_len, buf->alloc_addr, buf->alloc_len);
}

void patched_free(struct vulnerable_buffer *buf) {
    // Patched code: using alloc_phys as the DMA handle
    dma_free_coherent(NULL, buf->alloc_len, buf->alloc_addr, buf->alloc_phys);
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-43283
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-43283
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-43283/
[4] VulDB https://vuldb.com/cve/CVE-2026-43283
[5] https://git.kernel.org/stable/c/0f589ee54fd6d76d3f75e745f7f12c64cbd749e5
[6] https://git.kernel.org/stable/c/1b1371cd4032ae859838ebc74215f569987bb197
[7] https://git.kernel.org/stable/c/1b1d3c5d58a80a19d017a409aa2308162bab5bbf
[8] https://git.kernel.org/stable/c/1e300c33ef3cc544c2b9c693778fe9490cfe9184
[9] https://git.kernel.org/stable/c/7e54ff938bebb173822b4c38b33fc164c1cabf92
[10] https://git.kernel.org/stable/c/8320727be7ff704e07c87624efc2a4a75f54b3ce
[11] https://git.kernel.org/stable/c/accd0599bc8e73b962247c6c6c70ca7aa1f8e8d0
[12] https://git.kernel.org/stable/c/ffe68c3766997d82e9ccaf1cdbd47eba269c4aa2

Raw JSON Data

JSON

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