CVE-2026-23344

Description

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Fix use-after-free on error path In the error path of sev_tsm_init_locked(), the code dereferences 't' after it has been freed with kfree(). The pr_err() statement attempts to access t->tio_en and t->tio_init_done after the memory has been released. Move the pr_err() call before kfree(t) to access the fields while the memory is still valid. This issue reported by Smatch static analyser

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)

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

cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* - VULNERABLE

Linux Kernel (修复前版本)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual PoC for CVE-2026-23344
 * This snippet simulates the vulnerable logic in the kernel error path.
 */

#include <linux/kernel.h>
#include <linux/slab.h>

struct tsm_data {
    int tio_en;
    int tio_init_done;
};

void trigger_vulnerability(struct tsm_data *t) {
    // Simulate an error condition
    int error = 1;

    if (error) {
        // The bug: Memory is freed first
        kfree(t);

        // The UAF: Dereferencing t after free
        // In the real vulnerability, this is pr_err("...", t->tio_en, t->tio_init_done);
        pr_info("Error: tio_en=%d, tio_init_done=%d\n", t->tio_en, t->tio_init_done);
        return;
    }
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-23344
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-23344
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-23344/
[4] VulDB https://vuldb.com/cve/CVE-2026-23344
[5] https://git.kernel.org/stable/c/79a26fe3175b9ed7c0c9541b197cb9786237c0f7
[6] https://git.kernel.org/stable/c/889b0e2721e793eb46cf7d17b965aa3252af3ec8

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-23344", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:32.493", "lastModified": "2026-04-24T18:17:48.577", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Fix use-after-free on error path\n\nIn the error path of sev_tsm_init_locked(), the code dereferences 't'\nafter it has been freed with kfree(). The pr_err() statement attempts\nto access t->tio_en and t->tio_init_done after the memory has been\nreleased.\n\nMove the pr_err() call before kfree(t) to access the fields while the\nmemory is still valid.\n\nThis issue reported by Smatch static analyser"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: ccp - Corrección de uso después de liberación en la ruta de error\n\nEn la ruta de error de sev_tsm_init_locked(), el código desreferencia 't' después de que ha sido liberado con kfree(). La instrucción pr_err() intenta acceder a t->tio_en y t->tio_init_done después de que la memoria ha sido liberada.\n\nMover la llamada a pr_err() antes de kfree(t) para acceder a los campos mientras la memoria aún es válida.\n\nEste problema reportado por el analizador estático Smatch"}], "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: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}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-416"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19.1", "versionEndExcluding": "6.19.7", "matchCriteriaId": "8ACF56ED-6FE0-41DE-BECE-41134CC7BD44"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*", "matchCriteriaId": "35C8A871-4971-433E-A046-FC9F7B7D190A"}, {"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-4F85-9754-F9E5E11374A6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/79a26fe3175b9ed7c0c9541b197cb9786237c0f7", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/889b0e2721e793eb46cf7d17b965aa3252af3ec8", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}