CVE-2026-31646

Description

In the Linux kernel, the following vulnerability has been resolved: net: lan966x: fix page_pool error handling in lan966x_fdma_rx_alloc_page_pool() page_pool_create() can return an ERR_PTR on failure. The return value is used unconditionally in the loop that follows, passing the error pointer through xdp_rxq_info_reg_mem_model() into page_pool_use_xdp_mem(), which dereferences it, causing a kernel oops. Add an IS_ERR check after page_pool_create() to return early on failure.

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

cpe:2.3:o:linux:linux_kernel:6.2:-:*:*:*:*:*:* - VULNERABLE

Linux Kernel (带有lan966x驱动，修复补丁前)

PoC / Exploit Code

⚠ For Security Research Only

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

python

/*
 * PoC Concept: Demonstrating the missing error check leading to Kernel Oops.
 * This is a simplified representation of the vulnerable logic.
 */

struct page_pool *page_pool_create(...);
void xdp_rxq_info_reg_mem_model(...);

void vulnerable_function() {
    // Step 1: Call page_pool_create which might fail and return an error pointer
    struct page_pool *pool = page_pool_create(...);

    // VULNERABILITY: Missing IS_ERR(pool) check here.
    // If page_pool_create failed, 'pool' is an error pointer (e.g., -12).
    
    // Step 2: Unconditionally pass the pointer to XDP memory model registration
    // This function dereferences 'pool', causing a crash if it is invalid.
    xdp_rxq_info_reg_mem_model(..., pool);
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-31646
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-31646
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-31646/
[4] VulDB https://vuldb.com/cve/CVE-2026-31646
[5] https://git.kernel.org/stable/c/305832c53551cfbe6e5b81ca7ee765e60f4fe8e9
[6] https://git.kernel.org/stable/c/3fd0da4fd8851a7e62d009b7db6c4a05b092bc19
[7] https://git.kernel.org/stable/c/7caf90d9ab97951a58d1de85ab7e7d7cca7a4513
[8] https://git.kernel.org/stable/c/b5dcb41ba891b55157006cac79825c78a32b409e
[9] https://git.kernel.org/stable/c/e63265f188ea39dcf5f546770650027528f3bd0f

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-31646", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-04-24T15:16:43.967", "lastModified": "2026-04-27T20:19:01.043", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: lan966x: fix page_pool error handling in lan966x_fdma_rx_alloc_page_pool()\n\npage_pool_create() can return an ERR_PTR on failure. The return value\nis used unconditionally in the loop that follows, passing the error\npointer through xdp_rxq_info_reg_mem_model() into page_pool_use_xdp_mem(),\nwhich dereferences it, causing a kernel oops.\n\nAdd an IS_ERR check after page_pool_create() to return early on failure."}], "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-476"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2.1", "versionEndExcluding": "6.6.135", "matchCriteriaId": "D6A8AD2A-FCEB-42B6-8B79-66822D8E7C37"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.82", "matchCriteriaId": "02904CAE-71D2-45B3-9EC3-F6A9D18B6307"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.23", "matchCriteriaId": "E9E09FDD-9EE3-4A56-92E2-2B30AFD0072F"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.13", "matchCriteriaId": "1490EF9B-9080-481C-8D22-1306AAE664E4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:6.2:-:*:*:*:*:*:*", "matchCriteriaId": "3ADCCCEE-143A-4B48-9B2A-0CB97BD385DE"}, {"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/305832c53551cfbe6e5b81ca7ee765e60f4fe8e9", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/3fd0da4fd8851a7e62d009b7db6c4a05b092bc19", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/7caf90d9ab97951a58d1de85ab7e7d7cca7a4513", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/b5dcb41ba891b55157006cac79825c78a32b409e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/e63265f188ea39dcf5f546770650027528f3bd0f", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}