{"id":"CVE-2026-23298","state":"PUBLISHED","title":"can: ucan: Fix infinite loop from zero-length messages","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: ucan: Fix infinite loop from zero-length messages\n\nIf a broken ucan device gets a message with the message length field set\nto 0, then the driver will loop for forever in\nucan_read_bulk_callback(), hanging the system.  If the length is 0, just\nskip the message and go on to the next one.\n\nThis has been fixed in the kvaser_usb driver in the past in commit\n0c73772cd2b8 (\"can: kvaser_usb: leaf: Fix potential infinite loop in\ncommand parsers\"), so there must be some broken devices out there like\nthis somewhere.","publishedAt":"2026-03-25T10:26:54.830Z","updatedAt":"2026-05-11T22:04:10.668Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"ca07d3c6eef14d34e6fdeefe55058db045be29dc","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"e7bb6e0606b5f233531aaaad9542d69fbb792115","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"ab6f075492d37368b4c7b0df7f7fdc2b666887fc","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"13b646eec3ba1131180803f5aaf1fee23540ad8f","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"bd85f21a6219aeae4389d700c54f1799f4b814e0","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"aa9e0a7fe5efc2f74327fd37d828e9a51d9ff588","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"c7bc62be6c1a60bb21301692009590b1ffda91d9","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"1e446fd0582ad8be9f6dafb115fc2e7245f9bea7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/usb/ucan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.77","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/usb/ucan.c"]}],"references":["https://git.kernel.org/stable/c/ca07d3c6eef14d34e6fdeefe55058db045be29dc","https://git.kernel.org/stable/c/e7bb6e0606b5f233531aaaad9542d69fbb792115","https://git.kernel.org/stable/c/ab6f075492d37368b4c7b0df7f7fdc2b666887fc","https://git.kernel.org/stable/c/13b646eec3ba1131180803f5aaf1fee23540ad8f","https://git.kernel.org/stable/c/bd85f21a6219aeae4389d700c54f1799f4b814e0","https://git.kernel.org/stable/c/aa9e0a7fe5efc2f74327fd37d828e9a51d9ff588","https://git.kernel.org/stable/c/c7bc62be6c1a60bb21301692009590b1ffda91d9","https://git.kernel.org/stable/c/1e446fd0582ad8be9f6dafb115fc2e7245f9bea7"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:21.040Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/23xxx/CVE-2026-23298.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23298","state":"PUBLISHED","datePublished":"2026-03-25T10:26:54.830Z","dateUpdated":"2026-05-11T22:04:10.668Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-01-13T15:37:45.993Z"},"containers":{"cna":{"title":"can: ucan: Fix infinite loop from zero-length messages","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: ucan: Fix infinite loop from zero-length messages\n\nIf a broken ucan device gets a message with the message length field set\nto 0, then the driver will loop for forever in\nucan_read_bulk_callback(), hanging the system.  If the length is 0, just\nskip the message and go on to the next one.\n\nThis has been fixed in the kvaser_usb driver in the past in commit\n0c73772cd2b8 (\"can: kvaser_usb: leaf: Fix potential infinite loop in\ncommand parsers\"), so there must be some broken devices out there like\nthis somewhere."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"ca07d3c6eef14d34e6fdeefe55058db045be29dc","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"e7bb6e0606b5f233531aaaad9542d69fbb792115","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"ab6f075492d37368b4c7b0df7f7fdc2b666887fc","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"13b646eec3ba1131180803f5aaf1fee23540ad8f","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"bd85f21a6219aeae4389d700c54f1799f4b814e0","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"aa9e0a7fe5efc2f74327fd37d828e9a51d9ff588","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"c7bc62be6c1a60bb21301692009590b1ffda91d9","versionType":"git"},{"version":"9f2d3eae88d26c29d96e42983b755940d9169cd9","status":"affected","lessThan":"1e446fd0582ad8be9f6dafb115fc2e7245f9bea7","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/usb/ucan.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.77","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.17","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.7","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/can/usb/ucan.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/ca07d3c6eef14d34e6fdeefe55058db045be29dc"},{"url":"https://git.kernel.org/stable/c/e7bb6e0606b5f233531aaaad9542d69fbb792115"},{"url":"https://git.kernel.org/stable/c/ab6f075492d37368b4c7b0df7f7fdc2b666887fc"},{"url":"https://git.kernel.org/stable/c/13b646eec3ba1131180803f5aaf1fee23540ad8f"},{"url":"https://git.kernel.org/stable/c/bd85f21a6219aeae4389d700c54f1799f4b814e0"},{"url":"https://git.kernel.org/stable/c/aa9e0a7fe5efc2f74327fd37d828e9a51d9ff588"},{"url":"https://git.kernel.org/stable/c/c7bc62be6c1a60bb21301692009590b1ffda91d9"},{"url":"https://git.kernel.org/stable/c/1e446fd0582ad8be9f6dafb115fc2e7245f9bea7"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:04:10.668Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.17"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.19.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}