{"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"}}}}