{"id":"CVE-2026-93097","state":"PUBLISHED","title":"cxl/mbox: Break poison list loop on an empty payload","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mbox: Break poison list loop on an empty payload\n\nA device that returns count == 0 with CXL_POISON_FLAG_MORE set on every\niteration never advances nr_records, so the max_errors guard never\ntrips and the do/while loops forever while holding poison.mutex. That\nhangs the sysfs-triggered scan thread and blocks all subsequent poison\noperations on the device. The existing \"Protect against an uncleared\n_FLAG_MORE\" guard was intended to bound a misbehaving device but does\nnot cover the count == 0 case.\n\nStop the loop on an empty payload so a malfunctioning or malicious\ndevice cannot wedge the poison scan.","publishedAt":"2026-09-17T16:11:11.025Z","updatedAt":"2026-10-19T09:05:30.426Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"86771c105293ca26bfcc320b4f60d32c137b54aa","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"42eab80981f4d2ac820e253e80ecf92f8cd91f69","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"6ad491cef1a812cf7b53aa769cd8869516c47362","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"e77594e0cea67ab1c2317a27aa77a744e26ad6a6","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"8b301c4afbce4bc3f94528441d8d5ce1366504ad","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/mbox.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/mbox.c"]}],"references":["https://git.kernel.org/stable/c/86771c105293ca26bfcc320b4f60d32c137b54aa","https://git.kernel.org/stable/c/42eab80981f4d2ac820e253e80ecf92f8cd91f69","https://git.kernel.org/stable/c/6ad491cef1a812cf7b53aa769cd8869516c47362","https://git.kernel.org/stable/c/e77594e0cea67ab1c2317a27aa77a744e26ad6a6","https://git.kernel.org/stable/c/8b301c4afbce4bc3f94528441d8d5ce1366504ad"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93097.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93097","state":"PUBLISHED","datePublished":"2026-09-17T16:11:11.025Z","dateUpdated":"2026-10-19T09:05:30.426Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.084Z"},"containers":{"cna":{"title":"cxl/mbox: Break poison list loop on an empty payload","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncxl/mbox: Break poison list loop on an empty payload\n\nA device that returns count == 0 with CXL_POISON_FLAG_MORE set on every\niteration never advances nr_records, so the max_errors guard never\ntrips and the do/while loops forever while holding poison.mutex. That\nhangs the sysfs-triggered scan thread and blocks all subsequent poison\noperations on the device. The existing \"Protect against an uncleared\n_FLAG_MORE\" guard was intended to bound a misbehaving device but does\nnot cover the count == 0 case.\n\nStop the loop on an empty payload so a malfunctioning or malicious\ndevice cannot wedge the poison scan."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"86771c105293ca26bfcc320b4f60d32c137b54aa","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"42eab80981f4d2ac820e253e80ecf92f8cd91f69","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"6ad491cef1a812cf7b53aa769cd8869516c47362","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"e77594e0cea67ab1c2317a27aa77a744e26ad6a6","versionType":"git"},{"version":"ed83f7ca398b3798b82c1d5d1113011c0e5a2198","status":"affected","lessThan":"8b301c4afbce4bc3f94528441d8d5ce1366504ad","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/mbox.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.4","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cxl/core/mbox.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/86771c105293ca26bfcc320b4f60d32c137b54aa"},{"url":"https://git.kernel.org/stable/c/42eab80981f4d2ac820e253e80ecf92f8cd91f69"},{"url":"https://git.kernel.org/stable/c/6ad491cef1a812cf7b53aa769cd8869516c47362"},{"url":"https://git.kernel.org/stable/c/e77594e0cea67ab1c2317a27aa77a744e26ad6a6"},{"url":"https://git.kernel.org/stable/c/8b301c4afbce4bc3f94528441d8d5ce1366504ad"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:05:30.426Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}