net: airoha: Fix use-after-free in metadata dst teardown_CVE-2026-53248

8.8 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Description

In the Linux kernel, the following vulnerability has been resolved:

net: airoha: Fix use-after-free in metadata dst teardown

airoha_metadata_dst_free() runs metadata_dst_free() which frees the
metadata_dst with kfree() immediately, bypassing the RCU grace period.
In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from
the skb to the metadata_dst. This function requires RCU read-side
protection and the dst must remain valid until all RCU readers complete.
Since metadata_dst_free() calls kfree() directly, an use-after-free can
occur if any skb still holds a noref pointer to the dst when the driver
tears it down.
Replace metadata_dst_free() with dst_release() which properly goes
through the refcount path: when the refcount drops to zero, it schedules
the actual free via call_rcu_hurry(), ensuring all RCU readers have
completed before the memory is freed.

AI Analysis

Use-after-free vulnerability in the Linux kernel's airoha driver

Basic Information

ID CVE-2026-53248

Source Linux

Published Jun 25, 2026 at 08:39

Modified Jun 28, 2026 at 06:40

Affected Product

Vendor Linux

Product Linux

Version af3cf757d5c99011b9b94ea8d78aeaccc0153fdc

Affected Versions Linux Linux af3cf757d5c99011b9b94ea8d78aeaccc0153fdc
Linux Linux af3cf757d5c99011b9b94ea8d78aeaccc0153fdc
Linux Linux af3cf757d5c99011b9b94ea8d78aeaccc0153fdc
Linux Linux 6.15

AI Assessment

AI Score 8.8 / 10

AI Severity High

Vendor Linux

Product Linux Kernel

Version 6.15, af3cf757d5c99011b9b94ea8d78aeaccc0153fdc

References

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: airoha: Fix use-after-free in metadata dst teardown\n\nairoha_metadata_dst_free() runs metadata_dst_free() which frees the\nmetadata_dst with kfree() immediately, bypassing the RCU grace period.\nIn the RX path, skb_dst_set_noref() sets a non-refcounted pointer from\nthe skb to the metadata_dst. This function requires RCU read-side\nprotection and the dst must remain valid until all RCU readers complete.\nSince metadata_dst_free() calls kfree() directly, an use-after-free can\noccur if any skb still holds a noref pointer to the dst when the driver\ntears it down.\nReplace metadata_dst_free() with dst_release() which properly goes\nthrough the refcount path: when the refcount drops to zero, it schedules\nthe actual free via call_rcu_hurry(), ensuring all RCU readers have\ncompleted before the memory is freed.",
    "published": "2026-06-25T08:39:41.307Z",
    "modified": "2026-06-28T06:40:55.131Z",
    "type": "cve",
    "title": "net: airoha: Fix use-after-free in metadata dst teardown",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/6f829e2c17a53a35321268339cd252aff6d6d723\nhttps://git.kernel.org/stable/c/4b5a574e033e66d2131eff1c18feef8d8643c67e\nhttps://git.kernel.org/stable/c/b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0",
    "id": "CVE-2026-53248",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux af3cf757d5c99011b9b94ea8d78aeaccc0153fdc\nLinux Linux af3cf757d5c99011b9b94ea8d78aeaccc0153fdc\nLinux Linux af3cf757d5c99011b9b94ea8d78aeaccc0153fdc\nLinux Linux 6.15",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "af3cf757d5c99011b9b94ea8d78aeaccc0153fdc",
    "vendor": "Linux",
    "ai_description": "Use-after-free vulnerability in the Linux kernel's airoha driver",
    "ai_severity": "High",
    "ai_vendor": "Linux",
    "ai_product": "Linux Kernel",
    "ai_version": "6.15, af3cf757d5c99011b9b94ea8d78aeaccc0153fdc",
    "ai_score": 8.8
}