{"api_version":"1","generated_at":"2026-09-11T03:12:49+00:00","cve":"CVE-2026-80886","urls":{"html":"https://cve.report/CVE-2026-80886","api":"https://cve.report/api/cve/CVE-2026-80886.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80886","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80886"},"summary":{"title":"serial: msm: Disable DMA for kernel console UART","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: msm: Disable DMA for kernel console UART\n\nAt the moment, concurrent writes from userspace and the kernel to the\nconsole can trigger a race condition that results in an infinite loop of\nthe same messages printed over and over again. This is most likely to\nhappen during system startup or shutdown when the init system starts/stops\na large number of system services that interact with various kernel code.\n\nWhen userspace writes to the TTY device, the driver initiates an\nasynchronous DMA transfer and releases the port lock. At the same moment,\nthe kernel printk path might grab the port lock and re-configure the UART\ncontroller for PIO, without waiting for the DMA operation to complete. It\nseems like this collision results in zero progress being reported for the\nDMA engine, so the same text is printed to the console over and over again.\n\nFor the kernel console, we want a reliable output path that will be\nfunctional even during crashes etc. So rather than implementing complex\ncode to synchronize the kernel console write routines with the userspace\nDMA write routines, simply disable DMA for the console UART instance.\n\nSimilar checks exist in many other serial drivers, e.g. 8250_port.c,\nimx.c, sh-sci.c etc.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-04 17:17:01","updated_at":"2026-09-04 17:17:01"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/f58e568dc308c8e13f7730c8de2da5ed514e540d","name":"https://git.kernel.org/stable/c/f58e568dc308c8e13f7730c8de2da5ed514e540d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/abc1926c88c189e5d698b91ed6890e09ab5c321d","name":"https://git.kernel.org/stable/c/abc1926c88c189e5d698b91ed6890e09ab5c321d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bb4296de5b538b575978c588cb3738ab8524d01a","name":"https://git.kernel.org/stable/c/bb4296de5b538b575978c588cb3738ab8524d01a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/22dd2777e6c180e1c945b00f6d18550979436324","name":"https://git.kernel.org/stable/c/22dd2777e6c180e1c945b00f6d18550979436324","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d354716245192de2d203f2b35f22ab8dc13595e2","name":"https://git.kernel.org/stable/c/d354716245192de2d203f2b35f22ab8dc13595e2","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2727744ccb5ca59090451451ee94f530b1be04a5","name":"https://git.kernel.org/stable/c/2727744ccb5ca59090451451ee94f530b1be04a5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6acea62738ed4cae6746483026706a773b44dad7","name":"https://git.kernel.org/stable/c/6acea62738ed4cae6746483026706a773b44dad7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47","name":"https://git.kernel.org/stable/c/e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80886","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80886","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 f58e568dc308c8e13f7730c8de2da5ed514e540d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 bb4296de5b538b575978c588cb3738ab8524d01a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 6acea62738ed4cae6746483026706a773b44dad7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 abc1926c88c189e5d698b91ed6890e09ab5c321d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"80886","cve":"CVE-2026-80886","epss":"0.001800000","percentile":"0.076730000","score_date":"2026-09-07","updated_at":"2026-09-08 00:05:26"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/tty/serial/msm_serial.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f58e568dc308c8e13f7730c8de2da5ed514e540d","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"},{"lessThan":"bb4296de5b538b575978c588cb3738ab8524d01a","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"},{"lessThan":"6acea62738ed4cae6746483026706a773b44dad7","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"},{"lessThan":"abc1926c88c189e5d698b91ed6890e09ab5c321d","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"},{"lessThan":"2727744ccb5ca59090451451ee94f530b1be04a5","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"},{"lessThan":"d354716245192de2d203f2b35f22ab8dc13595e2","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"},{"lessThan":"e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"},{"lessThan":"22dd2777e6c180e1c945b00f6d18550979436324","status":"affected","version":"3a878c430fd6eb4f8587f9ebd187f773bf85d1d6","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/tty/serial/msm_serial.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.4"},{"lessThan":"4.4","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"4.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"4.4","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: msm: Disable DMA for kernel console UART\n\nAt the moment, concurrent writes from userspace and the kernel to the\nconsole can trigger a race condition that results in an infinite loop of\nthe same messages printed over and over again. This is most likely to\nhappen during system startup or shutdown when the init system starts/stops\na large number of system services that interact with various kernel code.\n\nWhen userspace writes to the TTY device, the driver initiates an\nasynchronous DMA transfer and releases the port lock. At the same moment,\nthe kernel printk path might grab the port lock and re-configure the UART\ncontroller for PIO, without waiting for the DMA operation to complete. It\nseems like this collision results in zero progress being reported for the\nDMA engine, so the same text is printed to the console over and over again.\n\nFor the kernel console, we want a reliable output path that will be\nfunctional even during crashes etc. So rather than implementing complex\ncode to synchronize the kernel console write routines with the userspace\nDMA write routines, simply disable DMA for the console UART instance.\n\nSimilar checks exist in many other serial drivers, e.g. 8250_port.c,\nimx.c, sh-sci.c etc."}],"providerMetadata":{"dateUpdated":"2026-09-04T16:49:35.864Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f58e568dc308c8e13f7730c8de2da5ed514e540d"},{"url":"https://git.kernel.org/stable/c/bb4296de5b538b575978c588cb3738ab8524d01a"},{"url":"https://git.kernel.org/stable/c/6acea62738ed4cae6746483026706a773b44dad7"},{"url":"https://git.kernel.org/stable/c/abc1926c88c189e5d698b91ed6890e09ab5c321d"},{"url":"https://git.kernel.org/stable/c/2727744ccb5ca59090451451ee94f530b1be04a5"},{"url":"https://git.kernel.org/stable/c/d354716245192de2d203f2b35f22ab8dc13595e2"},{"url":"https://git.kernel.org/stable/c/e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47"},{"url":"https://git.kernel.org/stable/c/22dd2777e6c180e1c945b00f6d18550979436324"}],"title":"serial: msm: Disable DMA for kernel console UART","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80886","datePublished":"2026-09-04T16:49:35.864Z","dateReserved":"2026-08-26T14:34:25.799Z","dateUpdated":"2026-09-04T16:49:35.864Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-04 17:17:01","lastModifiedDate":"2026-09-04 17:17:01","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80886","Ordinal":"1","Title":"serial: msm: Disable DMA for kernel console UART","CVE":"CVE-2026-80886","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80886","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nserial: msm: Disable DMA for kernel console UART\n\nAt the moment, concurrent writes from userspace and the kernel to the\nconsole can trigger a race condition that results in an infinite loop of\nthe same messages printed over and over again. This is most likely to\nhappen during system startup or shutdown when the init system starts/stops\na large number of system services that interact with various kernel code.\n\nWhen userspace writes to the TTY device, the driver initiates an\nasynchronous DMA transfer and releases the port lock. At the same moment,\nthe kernel printk path might grab the port lock and re-configure the UART\ncontroller for PIO, without waiting for the DMA operation to complete. It\nseems like this collision results in zero progress being reported for the\nDMA engine, so the same text is printed to the console over and over again.\n\nFor the kernel console, we want a reliable output path that will be\nfunctional even during crashes etc. So rather than implementing complex\ncode to synchronize the kernel console write routines with the userspace\nDMA write routines, simply disable DMA for the console UART instance.\n\nSimilar checks exist in many other serial drivers, e.g. 8250_port.c,\nimx.c, sh-sci.c etc.","Type":"Description","Title":"serial: msm: Disable DMA for kernel console UART"}]}}}