{"id":"CVE-2026-46039","state":"PUBLISHED","title":"rxgk: Fix potential integer overflow in length check","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxgk: Fix potential integer overflow in length check\n\nFix potential integer overflow in rxgk_extract_token() when checking the\nlength of the ticket.  Rather than rounding up the value to be tested\n(which might overflow), round down the size of the available data.","publishedAt":"2026-05-27T12:56:51.317Z","updatedAt":"2026-08-05T12:29:17.995Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2429a197648178cd4dc930a9d87c13c547460564","status":"affected","lessThan":"43222ac484f93b3ec2d240a7575e1cedd31f5fa4","versionType":"git"},{"version":"2429a197648178cd4dc930a9d87c13c547460564","status":"affected","lessThan":"183d37f12d1c8ed24a5bfc7addad05510da22a94","versionType":"git"},{"version":"2429a197648178cd4dc930a9d87c13c547460564","status":"affected","lessThan":"6929350080f4da292d111a3b33e53138fee51cec","versionType":"git"},{"version":"71571e187106631a8127f2dde780f35caa358d33","status":"affected","versionType":"git"},{"version":"6.16.9","status":"affected","lessThan":"6.17","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/rxgk_app.c","net/rxrpc/rxgk_common.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/rxgk_app.c","net/rxrpc/rxgk_common.h"]}],"references":["https://git.kernel.org/stable/c/43222ac484f93b3ec2d240a7575e1cedd31f5fa4","https://git.kernel.org/stable/c/183d37f12d1c8ed24a5bfc7addad05510da22a94","https://git.kernel.org/stable/c/6929350080f4da292d111a3b33e53138fee51cec"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46039.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46039","state":"PUBLISHED","datePublished":"2026-05-27T12:56:51.317Z","dateUpdated":"2026-08-05T12:29:17.995Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.093Z"},"containers":{"cna":{"title":"rxgk: Fix potential integer overflow in length check","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrxgk: Fix potential integer overflow in length check\n\nFix potential integer overflow in rxgk_extract_token() when checking the\nlength of the ticket.  Rather than rounding up the value to be tested\n(which might overflow), round down the size of the available data."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2429a197648178cd4dc930a9d87c13c547460564","status":"affected","lessThan":"43222ac484f93b3ec2d240a7575e1cedd31f5fa4","versionType":"git"},{"version":"2429a197648178cd4dc930a9d87c13c547460564","status":"affected","lessThan":"183d37f12d1c8ed24a5bfc7addad05510da22a94","versionType":"git"},{"version":"2429a197648178cd4dc930a9d87c13c547460564","status":"affected","lessThan":"6929350080f4da292d111a3b33e53138fee51cec","versionType":"git"},{"version":"71571e187106631a8127f2dde780f35caa358d33","status":"affected","versionType":"git"},{"version":"6.16.9","status":"affected","lessThan":"6.17","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/rxgk_app.c","net/rxrpc/rxgk_common.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.17","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rxrpc/rxgk_app.c","net/rxrpc/rxgk_common.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/43222ac484f93b3ec2d240a7575e1cedd31f5fa4"},{"url":"https://git.kernel.org/stable/c/183d37f12d1c8ed24a5bfc7addad05510da22a94"},{"url":"https://git.kernel.org/stable/c/6929350080f4da292d111a3b33e53138fee51cec"}],"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 - The bug is triggered by a crafted RxRPC RESPONSE packet received over UDP and parsed by the in-kernel rxgk server-side handshake (`rxgk_verify_response`); no local access is needed.\nAC:L - The integer overflow is deterministic for fixed `ticket_len` values (0xFFFFFFFD–0xFFFFFFFF), and all packet fields including the enumerable kvno/enctype used for the server-key lookup are attacker-controlled, so the attacker reliably triggers the OOB.\nPR:N - The RESPONSE packet is processed during the security handshake before the client is authenticated; the attacker needs no credentials, only a kvno/enctype matching a server key (a public, guessable identifier).\nUI:N - The rxrpc service processes incoming RESPONSE packets automatically with no victim interaction.\nS:U - The corruption is confined to the kernel's own memory within the same security authority; no VM/IOMMU boundary is crossed.\nC:H - The truncated negative length yields a ~4 GB scatterlist entry, causing an enormous out-of-bounds read of adjacent kernel memory during AEAD decryption, well beyond a few bounded bytes.\nI:H - The AEAD decrypt is in-place (src==dst scatterlist), so plaintext is written back across the oversized region, corrupting adjacent kernel heap memory (out-of-bounds write) before the fault.\nA:H - Reading/writing a ~4 GB region from a small skb buffer reliably hits unmapped memory, producing a kernel oops/panic (remote, unauthenticated DoS)."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:29:17.995Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"6.18.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"7.0.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}