CVE-2026-31619

Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: fireworks: bound device-supplied status before string array lookup The status field in an EFW response is a 32-bit value supplied by the firewire device. efr_status_names[] has 17 entries so a status value outside that range goes off into the weeds when looking at the %s value. Even worse, the status could return EFR_STATUS_INCOMPLETE which is 0x80000000, and is obviously not in that array of potential strings. Fix this up by properly bounding the index against the array size and printing "unknown" if it's not recognized.

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 (受影响版本包含多个稳定分支，具体见补丁提交)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC Concept for CVE-2026-31619
 * This code demonstrates the vulnerable logic in the kernel driver.
 * Exploitation requires physical access or simulation of a Firewire device.
 */

#include <stdio.h>
#include <stdint.h>

// Simulated vulnerable array size
#define ARRAY_SIZE 17

// Simulated vulnerable function logic
void vulnerable_lookup(uint32_t status) {
    const char *efr_status_names[ARRAY_SIZE] = {
        "OK", "Error", ... // 17 entries
    };

    // VULNERABILITY: No bounds check on 'status' before using it as index
    // If status is 0x80000000, this causes an out-of-bounds read/crash
    printf("Status: %s\n", efr_status_names[status]); 
}

int main() {
    printf("Simulating malicious device response...\n");
    // Malicious status value (EFR_STATUS_INCOMPLETE)
    uint32_t malicious_status = 0x80000000;
    
    // This would crash the kernel in the actual driver context
    vulnerable_lookup(malicious_status);
    
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31619
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31619
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31619/
[4] VulDB https://vuldb.com/cve/CVE-2026-31619
[5] https://git.kernel.org/stable/c/07704bbf36f57e4379e4cadf96410dab14621e3b
[6] https://git.kernel.org/stable/c/67cfd14074cdafab5de3f7cfc0952c1a9b653e5d
[7] https://git.kernel.org/stable/c/682d8accf0d83a871e8c327b95c81f53902c922b
[8] https://git.kernel.org/stable/c/cc624b3d2be13297100539b64ad950695188e046
[9] https://git.kernel.org/stable/c/e103f98f6615ed2934e9cf340654f0cad9eb8a8a
[10] https://git.kernel.org/stable/c/f856f4b6efd51be7950e4b84c06cd961961ca41c

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-31619", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-24T15:16:41.180", "lastModified": "2026-04-28T14:09:16.360", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: fireworks: bound device-supplied status before string array lookup\n\nThe status field in an EFW response is a 32-bit value supplied by the\nfirewire device. efr_status_names[] has 17 entries so a status value\noutside that range goes off into the weeds when looking at the %s value.\n\nEven worse, the status could return EFR_STATUS_INCOMPLETE which is\n0x80000000, and is obviously not in that array of potential strings.\n\nFix this up by properly bounding the index against the array size and\nprinting \"unknown\" if it's not recognized."}], "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": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.16", "versionEndExcluding": "6.6.136", "matchCriteriaId": "7482AD77-8977-4A6A-96C0-1B7E86AC25E9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.83", "matchCriteriaId": "7F0AE5B5-23AC-4DCC-B37A-51CA1DAE7BA8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.24", "matchCriteriaId": "8126B8B8-6D0B-4443-86C1-672AEE893555"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.14", "matchCriteriaId": "D6A8A074-BBF4-4803-ABED-519A839435BB"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.0.1", "matchCriteriaId": "9B5888AB-7403-4335-89E4-21CC0B48366A"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/07704bbf36f57e4379e4cadf96410dab14621e3b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/67cfd14074cdafab5de3f7cfc0952c1a9b653e5d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/682d8accf0d83a871e8c327b95c81f53902c922b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/cc624b3d2be13297100539b64ad950695188e046", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e103f98f6615ed2934e9cf340654f0cad9eb8a8a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/f856f4b6efd51be7950e4b84c06cd961961ca41c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}