CVE-2026-53247

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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, a 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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - Packets received on the affected MediaTek Ethernet/DSA data path can cause skbs to carry the vulnerable non-refcounted metadata dst. In a severe reasonable deployment, this is reachable by an unauthenticated network peer sending traffic to an exposed Ethernet interface.\nAC:L - The RX path reliably assigns the metadata dst under the DSA hardware untagging conditions, and the bug is a straightforward lifetime violation during teardown. Given the requirement to choose higher severity when uncertain, the teardown timing does not justify AC:H.\nPR:N - The attacker needs no credentials to send packets that enter the affected RX path and populate skbs with the stale metadata pointer. Administrative teardown is a device lifecycle condition, not an attacker privilege requirement.\nUI:N - No victim user must open a file or perform a protocol-level action for malicious packets to enter the vulnerable path. The vulnerable condition can occur during normal device teardown or cleanup.\nS:U - The corruption occurs within the same kernel security authority as the affected network driver and networking stack. There is no guest-to-host, IOMMU, or separate-scope boundary crossing.\nC:H - This is a kernel use-after-free of a metadata_dst object referenced from skbs. Such memory corruption can plausibly be shaped into kernel memory disclosure.\nI:H - A kernel use-after-free can plausibly be exploited through heap reuse to corrupt controlled kernel objects or hijack control/data flow. Under the required higher-severity rule, integrity impact is High.\nA:H - The stale dst pointer can be dereferenced by GRO/DSA/network stack processing after immediate kfree. Even without full exploitation, this can cause kernel oops or panic."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mediatek/mtk_eth_soc.c"], "versions": [{"version": "2d7605a729062bb554f03c5983d8cfb8c0b42e9c", "lessThan": "72775977e89c25c99ee84d2c5baa3f86a8ba5cb4", "status": "affected", "versionType": "git"}, {"version": "2d7605a729062bb554f03c5983d8cfb8c0b42e9c", "lessThan": "459c6f35c58cf0fd5247e55d73ddaa29571d9b7e", "status": "affected", "versionType": "git"}, {"version": "2d7605a729062bb554f03c5983d8cfb8c0b42e9c", "lessThan": "e634408d2b0cd939cfe019398a21fb47b7a8ffe3", "status": "affected", "versionType": "git"}, {"version": "2d7605a729062bb554f03c5983d8cfb8c0b42e9c", "lessThan": "2d86aeb46d5f69c704065a8c69822582787272a1", "status": "affected", "versionType": "git"}, {"version": "2d7605a729062bb554f03c5983d8cfb8c0b42e9c", "lessThan": "80df409e1a483676826a6c66e693dba6ac507751", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mediatek/mtk_eth_soc.c"], "versions": [{"version": "6.2", "status": "affected"}, {"version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.143", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.94", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.36", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.13", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.143"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.94"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.36"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.0.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4"}, {"url": "https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e"}, {"url": "https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3"}, {"url": "https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1"}, {"url": "https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751"}], "title": "net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown", "x_generator": {"engine": "bippy-1.2.0"}}}}

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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, a 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."}], "id": "CVE-2026-53247", "lastModified": "2026-07-07T22:16:24.543", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-06-25T09:16:42.657", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown", "id": "2492778", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492778"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's ethernet driver for MediaTek (mtk_eth_soc) network devices. This vulnerability, a 'use-after-free', occurs when the system attempts to free a memory region while it is still being used by network packet processing. This can allow a local attacker to trigger system instability, potentially leading to a denial of service (DoS) or, in some cases, unauthorized code execution."], "name": "CVE-2026-53247", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53247\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53247\nhttps://lore.kernel.org/linux-cve-announce/2026062512-CVE-2026-53247-7eed@gregkh/T"]}

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