CVE-2025-71301

Description

In the Linux kernel, the following vulnerability has been resolved: drm/tests: shmem: Hold reservation lock around vmap/vunmap Acquire and release the GEM object's reservation lock around vmap and vunmap operations. The tests use vmap_locked, which led to errors such as show below. [ 122.292030] WARNING: CPU: 3 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:390 drm_gem_shmem_vmap_locked+0x3a3/0x6f0 [ 122.468066] WARNING: CPU: 3 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:293 drm_gem_shmem_pin_locked+0x1fe/0x350 [ 122.563504] WARNING: CPU: 3 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:234 drm_gem_shmem_get_pages_locked+0x23c/0x370 [ 122.662248] WARNING: CPU: 2 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:452 drm_gem_shmem_vunmap_locked+0x101/0x330 Only export the new vmap/vunmap helpers for Kunit tests. These are not interfaces for regular drivers.

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 (Specific stable branches prior to commit 6b953d92f2f29e74b125617c6f00300fa1bed97e)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * Conceptual PoC for CVE-2025-71301
 * This snippet demonstrates the missing lock context that leads to the race condition.
 * Note: Actual exploitation requires a local environment with DRM enabled.
 */

#include <linux/module.h>
#include <linux/drm/drm_gem_shmem_helper.h>

// Function simulating the vulnerable behavior
static int simulate_vulnerability(struct drm_gem_shmem_object *shmem)
{
    int ret;
    struct dma_buf_map map;

    // Vulnerability: The reservation lock is NOT held here.
    // In a correct implementation, dma_resv_lock(shmem->base.resv, NULL) should be called.

    // Calling the locked helper without the lock triggers the WARNING
    ret = drm_gem_shmem_vmap_locked(shmem, &map);
    if (ret) {
        pr_err("Failed to vmap: %d\n", ret);
        return ret;
    }

    // Perform operations on mapped memory...

    // Cleanup
    drm_gem_shmem_vunmap_locked(shmem, &map);

    // Vulnerability: Missing dma_resv_unlock(shmem->base.resv);

    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-71301
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-71301
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-71301/
[4] VulDB https://vuldb.com/cve/CVE-2025-71301
[5] https://git.kernel.org/stable/c/6b953d92f2f29e74b125617c6f00300fa1bed97e
[6] https://git.kernel.org/stable/c/cda83b099f117f2a28a77bf467af934cb39e49cf
[7] https://git.kernel.org/stable/c/e7b7022f11d3cf281c726117478696b83681bf11

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-71301", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-08T14:16:31.497", "lastModified": "2026-05-14T19:09:41.500", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/tests: shmem: Hold reservation lock around vmap/vunmap\n\nAcquire and release the GEM object's reservation lock around vmap and\nvunmap operations. The tests use vmap_locked, which led to errors such\nas show below.\n\n[ 122.292030] WARNING: CPU: 3 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:390 drm_gem_shmem_vmap_locked+0x3a3/0x6f0\n\n[ 122.468066] WARNING: CPU: 3 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:293 drm_gem_shmem_pin_locked+0x1fe/0x350\n\n[ 122.563504] WARNING: CPU: 3 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:234 drm_gem_shmem_get_pages_locked+0x23c/0x370\n\n[ 122.662248] WARNING: CPU: 2 PID: 1413 at drivers/gpu/drm/drm_gem_shmem_helper.c:452 drm_gem_shmem_vunmap_locked+0x101/0x330\n\nOnly export the new vmap/vunmap helpers for Kunit tests. These are\nnot interfaces for regular drivers."}], "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": "6.16", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4562EDA-AFEA-4C62-97CC-C83E109A5F19"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6b953d92f2f29e74b125617c6f00300fa1bed97e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/cda83b099f117f2a28a77bf467af934cb39e49cf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e7b7022f11d3cf281c726117478696b83681bf11", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}