{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-53248", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.394Z", "datePublished": "2026-06-25T08:39:41.307Z", "dateUpdated": "2026-08-05T12:34:32.572Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:34:32.572Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - An unauthenticated network peer can feed packets into the Airoha Ethernet RX path, where `skb_dst_set_noref()` attaches the metadata_dst used by DSA. In router/embedded deployments this RX path can be exposed on network-facing Ethernet ports.\nAC:L - The bug is a straightforward lifetime violation: attacker-supplied traffic can keep SKBs carrying the noref dst while teardown frees the object without an RCU grace period. Per the UAF guidance, no special hard-to-control condition is required beyond arranging traffic around teardown.\nPR:N - The attacker does not need local credentials to supply the RX packets that hold the stale metadata pointer. The privileged driver teardown is treated as victim/system interaction rather than attacker-held privileges.\nUI:R - Exploitation requires the device/driver to be torn down, such as by platform-driver unbind or module unload, while attacker-fed SKBs still reference the metadata_dst. That teardown is not triggered by normal packets alone.\nS:U - The vulnerability corrupts kernel networking state within the same kernel security authority. It does not cross a VM, IOMMU, or separate security-scope boundary.\nC:H - This is a kernel use-after-free of a heap-allocated metadata_dst reachable from packet processing. Following the UAF scoring rule, freed-object reuse can enable kernel memory disclosure.\nI:H - Kernel UAFs can be leveraged through heap reuse and spraying into broader memory corruption or control-flow manipulation. The fix changes lifetime management to RCU-delayed `dst_release()`, confirming the stale pointer risk.\nA:H - A stale dst pointer can be dereferenced during DSA receive processing after the object was freed. This can cause kernel oops/panic or network stack failure." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/airoha/airoha_eth.c" ], "versions": [ { "version": "af3cf757d5c99011b9b94ea8d78aeaccc0153fdc", "lessThan": "6f829e2c17a53a35321268339cd252aff6d6d723", "status": "affected", "versionType": "git" }, { "version": "af3cf757d5c99011b9b94ea8d78aeaccc0153fdc", "lessThan": "4b5a574e033e66d2131eff1c18feef8d8643c67e", "status": "affected", "versionType": "git" }, { "version": "af3cf757d5c99011b9b94ea8d78aeaccc0153fdc", "lessThan": "b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0", "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/airoha/airoha_eth.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "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": "6.15", "versionEndExcluding": "6.18.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.0.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6f829e2c17a53a35321268339cd252aff6d6d723" }, { "url": "https://git.kernel.org/stable/c/4b5a574e033e66d2131eff1c18feef8d8643c67e" }, { "url": "https://git.kernel.org/stable/c/b38cae85d1c45ff189d7ecb6ac36f41cdc3d84d0" } ], "title": "net: airoha: Fix use-after-free in metadata dst teardown", "x_generator": { "engine": "bippy-1.2.0" } } } }