CVE-2026-23357

Description

In the Linux kernel, the following vulnerability has been resolved: can: mcp251x: fix deadlock in error path of mcp251x_open The mcp251x_open() function call free_irq() in its error path with the mpc_lock mutex held. But if an interrupt already occurred the interrupt handler will be waiting for the mpc_lock and free_irq() will deadlock waiting for the handler to finish. This issue is similar to the one fixed in commit 7dd9c26bd6cf ("can: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open") but for the error path. To solve this issue move the call to free_irq() after the lock is released. Setting `priv->force_quit = 1` beforehand ensure that the IRQ handler will exit right away once it acquired the lock.

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 (多个稳定分支，具体见参考链接)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual Proof of Concept for CVE-2026-23357
 * Triggering the deadlock requires specific hardware timing.
 * This is a simplified representation of the logic flow.
 */

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

// Hypothetical trigger function
void trigger_deadlock_scenario(struct net_device *net) {
    // 1. Attempt to open the device (mcp251x_open)
    // Internally, this acquires mpc_lock.
    
    // 2. Simulate an error condition during open
    // This leads to the error path where free_irq is called
    // while holding mpc_lock.
    
    // 3. Simultaneously, an interrupt occurs (hardware dependent)
    // The IRQ handler tries to acquire mpc_lock.
    
    // Result: Deadlock.
}

/*
 * Fix Check: Verify that free_irq is called after mutex_unlock.
 */

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-23357
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-23357
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-23357/
[4] VulDB https://vuldb.com/cve/CVE-2026-23357
[5] https://git.kernel.org/stable/c/256f0cff6e946c570392bda1d01a65e789a7afd0
[6] https://git.kernel.org/stable/c/38063cc435b69d56e76f947c10d336fcb2953508
[7] https://git.kernel.org/stable/c/416c18ecddafab0ed09be1e7b9d2f448f3d4db16
[8] https://git.kernel.org/stable/c/739454057572cb0948658d1142f3fa2c6966465c
[9] https://git.kernel.org/stable/c/ab3f894de216f4a62adc3b57e9191888cbf26885
[10] https://git.kernel.org/stable/c/b73832292cd914e87a55e863ba4413a907e7db6b
[11] https://git.kernel.org/stable/c/d27f12c3f5e85efc479896af4a69eccb37f75e8e
[12] https://git.kernel.org/stable/c/e728f444c913a91d290d1824b4770780bbd6378e

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-23357", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:34.450", "lastModified": "2026-04-24T19:04:35.540", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: mcp251x: fix deadlock in error path of mcp251x_open\n\nThe mcp251x_open() function call free_irq() in its error path with the\nmpc_lock mutex held. But if an interrupt already occurred the\ninterrupt handler will be waiting for the mpc_lock and free_irq() will\ndeadlock waiting for the handler to finish.\n\nThis issue is similar to the one fixed in commit 7dd9c26bd6cf (\"can:\nmcp251x: fix deadlock if an interrupt occurs during mcp251x_open\") but\nfor the error path.\n\nTo solve this issue move the call to free_irq() after the lock is\nreleased. Setting `priv->force_quit = 1` beforehand ensure that the IRQ\nhandler will exit right away once it acquired the lock."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncan: mcp251x: corregir interbloqueo en la ruta de error de mcp251x_open\n\nLa función mcp251x_open() llama a free_irq() en su ruta de error con el mutex mpc_lock retenido. Pero si ya ocurrió una interrupción, el gestor de interrupciones estará esperando por el mpc_lock y free_irq() se interbloqueará esperando a que el gestor termine.\n\nEste problema es similar al resuelto en el commit 7dd9c26bd6cf ('can: mcp251x: corregir interbloqueo si ocurre una interrupción durante mcp251x_open') pero para la ruta de error.\n\nPara resolver este problema, mueva la llamada a free_irq() después de que se libere el bloqueo. Establecer `priv->force_quit = 1` de antemano asegura que el gestor IRQ saldrá de inmediato una vez que haya adquirido el bloqueo."}], "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-667"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.34.1", "versionEndExcluding": "5.10.253", "matchCriteriaId": "F8124DB0-E974-47F7-A4CE-1F4CEA46F14B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.203", "matchCriteriaId": "20DDB3E9-AABF-4107-ADB0-5362AA067045"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.167", "matchCriteriaId": "2EDC6BAF-B710-4E26-B6AA-D68922EE7B43"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.130", "matchCriteriaId": "C57BB918-DF28-46B3-94F7-144176841267"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.77", "matchCriteriaId": "B3D12E00-E42D-4056-B354-BAD4903C03A5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.17", "matchCriteriaId": "A5E006E4-59C7-43C1-9231-62A72219F2BA"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.7", "matchCriteriaId": "69245D10-0B71-485E-80C3-A64F077004D3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:2.6.34:-:*:*:*:*:*:*", "matchCriteriaId": "A3B1BC1D-ED46-4364-A1D9-1FA74182B03A"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-97 ... 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