{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49997", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.387Z", "datePublished": "2025-06-18T11:00:57.072Z", "dateUpdated": "2026-08-05T08:57:05.467Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:05.467Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: lantiq_xrx200: restore buffer if memory allocation failed\n\nIn a situation where memory allocation fails, an invalid buffer address\nis stored. When this descriptor is used again, the system panics in the\nbuild_skb() function when accessing memory." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is the Lantiq XRX200 Ethernet PMAC NAPI RX path, reached solely by frames arriving on the wire to the CPU port of VRX200 DSL gateways; a remote attacker’s packets both induce RX buffer refill and later reuse the poisoned descriptor with no local access required.\nAC:L - An attacker can reliably create the triggering condition by flooding a memory-constrained embedded gateway until napi_alloc_frag fails, permanently storing NULL in that ring slot; any subsequent received frame that reuses the descriptor then crashes, with no uncontrolled race or layout dependency.\nPR:N - There is no authentication, capability check, or credential gate between frame arrival and xrx200_hw_receive()/xrx200_alloc_buf()—reception runs in softirq/NAPI before any socket-level authorization, so unauthenticated network traffic suffices.\nUI:N - The RX path runs autonomously in NAPI/softirq whenever frames arrive; no local user must open a device, mount anything, or take any action for the NULL dereference to occur.\nS:U - The panic and its consequences stay within the host kernel’s security authority on the affected gateway; there is no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:N - build_skb(NULL) faults while constructing skb_shared_info at a low address derived from a NULL head and aborts without returning kernel memory, pointers, or freed-object contents to the attacker.\nI:N - This is a stored NULL software pointer followed by a NULL dereference in build_skb, not an attacker-controlled out-of-bounds/UAF write or type confusion; execution aborts before any control-flow hijack or data-modification primitive is obtained.\nA:H - The NULL pointer dereference occurs in softirq/NAPI context and panics the kernel as described in the fix, fully denying service on the device and remaining re-triggerable after reboot under the same traffic load." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/lantiq_xrx200.c" ], "versions": [ { "version": "7ea6cd16f1599c1eac6018751eadbc5fc736b99a", "lessThan": "3ef2786e32d93e562cd40601248a14ae090de873", "status": "affected", "versionType": "git" }, { "version": "7ea6cd16f1599c1eac6018751eadbc5fc736b99a", "lessThan": "c9c3b1775f80fa21f5bff874027d2ccb10f5d90c", "status": "affected", "versionType": "git" }, { "version": "217395c5ab15e92a4fd84fe77fab6b0b1bb4e456", "status": "affected", "versionType": "git" }, { "version": "70c8418469fb22a679fe5015ebe60fe15011ea43", "status": "affected", "versionType": "git" }, { "version": "5e006cdb9b759f604c4fc69b410aab37cf45f5b4", "status": "affected", "versionType": "git" }, { "version": "5.4.128", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.10.46", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.12.13", "lessThan": "5.13", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/lantiq_xrx200.c" ], "versions": [ { "version": "5.13", "status": "affected" }, { "version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.6", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "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": "5.13", "versionEndExcluding": "5.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.128" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3ef2786e32d93e562cd40601248a14ae090de873" }, { "url": "https://git.kernel.org/stable/c/c9c3b1775f80fa21f5bff874027d2ccb10f5d90c" } ], "title": "net: lantiq_xrx200: restore buffer if memory allocation failed", "x_generator": { "engine": "bippy-1.2.0" } } } }