{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31633","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-03-09T15:48:24.125Z","datePublished":"2026-04-24T14:44:48.621Z","dateUpdated":"2026-08-05T12:23:58.581Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T12:23:58.581Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix integer overflow in rxgk_verify_response()\n\nIn rxgk_verify_response(), there's a potential integer overflow due to\nrounding up token_len before checking it, thereby allowing the length check to\nbe bypassed.\n\nFix this by checking the unrounded value against len too (len is limited as\nthe response must fit in a single UDP packet)."}],"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 - rxgk_verify_response() is reached by a remote RxRPC RESPONSE packet over UDP on a listening RxRPC service using YFS-RxGK security.\nAC:L - The attacker controls the RESPONSE packet fields needed to trigger the integer overflow; no race or condition outside attacker control is required.\nPR:N - The vulnerable parsing occurs during the service-side challenge/response handshake before the RESPONSE authenticator is verified, so no authenticated credentials are required.\nUI:N - No victim user action is required once an affected RxRPC service is listening and reachable.\nS:U - The impact is within the kernel/RxRPC service security authority and does not cross a separate sandbox, VM, or hardware boundary.\nC:H - The overflow can cause subsequent token/authenticator parsing and crypto scatterlist construction to operate on attacker-controlled impossible lengths, creating out-of-bounds memory access potential.\nI:H - The affected decryption path operates in place over scatterlists derived from corrupted lengths, making kernel memory corruption and control-flow-relevant modification defensible.\nA:H - Related oversized RxGK RESPONSE length paths reach skb_to_sgvec() BUG_ON(len), and this overflow can similarly drive impossible lengths, causing a remote kernel crash."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/rxgk.c"],"versions":[{"version":"9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a","lessThan":"1f864d9daaf622aeaa774404fd51e7d6a435b046","status":"affected","versionType":"git"},{"version":"9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a","lessThan":"c1e242beb6b1efc3c286f617e8d940c8fbf2ed41","status":"affected","versionType":"git"},{"version":"9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a","lessThan":"699e52180f4231c257821c037ed5c99d5eb0edb8","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/rxgk.c"],"versions":[{"version":"6.16","status":"affected"},{"version":"0","lessThan":"6.16","status":"unaffected","versionType":"semver"},{"version":"6.18.23","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.13","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"6.16","versionEndExcluding":"6.18.23"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.19.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/1f864d9daaf622aeaa774404fd51e7d6a435b046"},{"url":"https://git.kernel.org/stable/c/c1e242beb6b1efc3c286f617e8d940c8fbf2ed41"},{"url":"https://git.kernel.org/stable/c/699e52180f4231c257821c037ed5c99d5eb0edb8"}],"title":"rxrpc: Fix integer overflow in rxgk_verify_response()","x_generator":{"engine":"bippy-1.2.0"}}}}