{"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"}}}}