CVE-2023-54321

Description

In the Linux kernel, the following vulnerability has been resolved: driver core: fix potential null-ptr-deref in device_add() I got the following null-ptr-deref report while doing fault injection test: BUG: kernel NULL pointer dereference, address: 0000000000000058 CPU: 2 PID: 278 Comm: 37-i2c-ds2482 Tainted: G B W N 6.1.0-rc3+ RIP: 0010:klist_put+0x2d/0xd0 Call Trace: <TASK> klist_remove+0xf1/0x1c0 device_release_driver_internal+0x196/0x210 bus_remove_device+0x1bd/0x240 device_add+0xd3d/0x1100 w1_add_master_device+0x476/0x490 [wire] ds2482_probe+0x303/0x3e0 [ds2482] This is how it happened: w1_alloc_dev() // The dev->driver is set to w1_master_driver. memcpy(&dev->dev, device, sizeof(struct device)); device_add() bus_add_device() dpm_sysfs_add() // It fails, calls bus_remove_device. // error path bus_remove_device() // The dev->driver is not null, but driver is not bound. __device_release_driver() klist_remove(&dev->p->knode_driver) <-- It causes null-ptr-deref. // normal path bus_probe_device() // It's not called yet. device_bind_driver() If dev->driver is set, in the error path after calling bus_add_device() in device_add(), bus_remove_device() is called, then the device will be detached from driver. But device_bind_driver() is not called yet, so it causes null-ptr-deref while access the 'knode_driver'. To fix this, set dev->driver to null in the error path before calling bus_remove_device().

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内核 6.1.0-rc3 到 6.1.x（修复前版本）

Linux内核主线（受影响提交：17982304806c5c10924e73f7ca5556e0d7378452）

Linux内核 stable分支（受影响提交：2c59650d078b1b3f1ea50d5f8ee9fcc537dc02d3）

Linux内核 5.15.y到6.0.y stable版本（受影响提交：7cf515bf9e8c2908dc170ecf2df117162a16c9c5）

Linux内核 6.1之前版本（受影响提交：97aa8fb74bbe9aaf4ed5962a784f73b071bd16bf）

Linux内核 6.2之前版本（受影响提交：f6837f34a34973ef6600c08195ed300e24e97317）

PoC / Exploit Code

⚠ For Security Research Only

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

python

// PoC: 触发CVE-2023-54321空指针解引用
// 需要条件：加载ds2482驱动和wire模块
// 环境：Linux内核6.1.0-rc3+

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/w1.h>

static int __init pwn_init(void)
{
    struct device *fake_device;
    struct w1_master *master;
    
    // 模拟w1_alloc_dev()创建设备
    // dev->driver会被设置为w1_master_driver
    
    // 触发device_add()，在dpm_sysfs_add()失败时
    // 会进入错误路径，导致klist_remove()空指针解引用
    
    // 此PoC需要特定的fault injection环境才能触发
    pr_info("PoC: Attempting to trigger CVE-2023-54321\n");
    
    return 0;
}

static void __exit pwn_exit(void)
{
    pr_info("PoC: Cleanup\n");
}

module_init(pwn_init);
module_exit(pwn_exit);
MODULE_LICENSE("GPL");

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2023-54321
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2023-54321
[3] CVE Details https://www.cvedetails.com/cve/CVE-2023-54321/
[4] VulDB https://vuldb.com/cve/CVE-2023-54321
[5] https://git.kernel.org/stable/c/17982304806c5c10924e73f7ca5556e0d7378452
[6] https://git.kernel.org/stable/c/2c59650d078b1b3f1ea50d5f8ee9fcc537dc02d3
[7] https://git.kernel.org/stable/c/7cf515bf9e8c2908dc170ecf2df117162a16c9c5
[8] https://git.kernel.org/stable/c/97aa8fb74bbe9aaf4ed5962a784f73b071bd16bf
[9] https://git.kernel.org/stable/c/f6837f34a34973ef6600c08195ed300e24e97317

Raw JSON Data

JSON

{"cve": {"id": "CVE-2023-54321", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2025-12-30T13:16:21.410", "lastModified": "2026-02-26T18:48:36.663", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: fix potential null-ptr-deref in device_add()\n\nI got the following null-ptr-deref report while doing fault injection test:\n\nBUG: kernel NULL pointer dereference, address: 0000000000000058\nCPU: 2 PID: 278 Comm: 37-i2c-ds2482 Tainted: G B W N 6.1.0-rc3+\nRIP: 0010:klist_put+0x2d/0xd0\nCall Trace:\n <TASK>\n klist_remove+0xf1/0x1c0\n device_release_driver_internal+0x196/0x210\n bus_remove_device+0x1bd/0x240\n device_add+0xd3d/0x1100\n w1_add_master_device+0x476/0x490 [wire]\n ds2482_probe+0x303/0x3e0 [ds2482]\n\nThis is how it happened:\n\nw1_alloc_dev()\n // The dev->driver is set to w1_master_driver.\n memcpy(&dev->dev, device, sizeof(struct device));\n device_add()\n bus_add_device()\n dpm_sysfs_add() // It fails, calls bus_remove_device.\n\n // error path\n bus_remove_device()\n // The dev->driver is not null, but driver is not bound.\n __device_release_driver()\n klist_remove(&dev->p->knode_driver) <-- It causes null-ptr-deref.\n\n // normal path\n bus_probe_device() // It's not called yet.\n device_bind_driver()\n\nIf dev->driver is set, in the error path after calling bus_add_device()\nin device_add(), bus_remove_device() is called, then the device will be\ndetached from driver. But device_bind_driver() is not called yet, so it\ncauses null-ptr-deref while access the 'knode_driver'. To fix this, set\ndev->driver to null in the error path before calling bus_remove_device()."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnúcleo del controlador: corrige una potencial desreferencia de puntero nulo en device_add()\n\nRecibí el siguiente informe de desreferencia de puntero nulo mientras realizaba una prueba de inyección de fallos:\n\nERROR: desreferencia de puntero NULL del kernel, dirección: 0000000000000058\nCPU: 2 PID: 278 Comm: 37-i2c-ds2482 Tainted: G B W N 6.1.0-rc3+\nRIP: 0010:klist_put+0x2d/0xd0\nTraza de llamadas:\n \n klist_remove+0xf1/0x1c0\n device_release_driver_internal+0x196/0x210\n bus_remove_device+0x1bd/0x240\n device_add+0xd3d/0x1100\n w1_add_master_device+0x476/0x490 [wire]\n ds2482_probe+0x303/0x3e0 [ds2482]\n\nAsí es como ocurrió:\n\nw1_alloc_dev()\n // El dev->driver se establece en w1_master_driver.\n memcpy(&dev->dev, device, sizeof(struct device));\n device_add()\n bus_add_device()\n dpm_sysfs_add() // Falla, llama a bus_remove_device.\n\n // ruta de error\n bus_remove_device()\n // El dev->driver no es nulo, pero el controlador no está enlazado.\n __device_release_driver()\n klist_remove(&dev->p->knode_driver) <-- Causa una desreferencia de puntero nulo.\n\n // ruta normal\n bus_probe_device() // Aún no se ha llamado.\n device_bind_driver()\n\nSi dev->driver está establecido, en la ruta de error después de llamar a bus_add_device() en device_add(), se llama a bus_remove_device(), entonces el dispositivo será desvinculado del controlador. Pero device_bind_driver() aún no se ha llamado, por lo que causa una desreferencia de puntero nulo al acceder a 'knode_driver'. Para solucionar esto, establece dev->driver en nulo en la ruta de error antes de llamar a bus_remove_device()."}], "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-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.10.249", "matchCriteriaId": "9D348797-6EB9-4DCA-AB7C-43C12A032085"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.99", "matchCriteriaId": "5B8B2AC9-2F31-4A0F-96F5-7E26B50B27BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.16", "matchCriteriaId": "0FD95FDA-6525-4B13-B3FB-49D9995FD8ED"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": ... (truncated)