{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53247", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.394Z", "datePublished": "2026-06-25T08:39:40.654Z", "dateUpdated": "2026-08-05T12:34:31.498Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:31.498Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown\n\nmtk_free_dev() calls metadata_dst_free() which frees the metadata_dst\nwith 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, 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" } } } }