{"id":"CVE-2024-26627","state":"PUBLISHED","title":"scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Move scsi_host_busy() out of host lock for waking up EH handler\n\nInside scsi_eh_wakeup(), scsi_host_busy() is called & checked with host\nlock every time for deciding if error handler kthread needs to be waken up.\n\nThis can be too heavy in case of recovery, such as:\n\n - N hardware queues\n\n - queue depth is M for each hardware queue\n\n - each scsi_host_busy() iterates over (N * M) tag/requests\n\nIf recovery is triggered in case that all requests are in-flight, each\nscsi_eh_wakeup() is strictly serialized, when scsi_eh_wakeup() is called\nfor the last in-flight request, scsi_host_busy() has been run for (N * M -\n1) times, and request has been iterated for (N*M - 1) * (N * M) times.\n\nIf both N and M are big enough, hard lockup can be triggered on acquiring\nhost lock, and it is observed on mpi3mr(128 hw queues, queue depth 8169).\n\nFix the issue by calling scsi_host_busy() outside the host lock. We don't\nneed the host lock for getting busy count because host the lock never\ncovers that.\n\n[mkp: Drop unnecessary 'busy' variables pointed out by Bart]","publishedAt":"2024-03-06T06:45:34.339Z","updatedAt":"2026-05-11T20:01:04.897Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"f5944853f7a961fedc1227dc8f60393f8936d37c","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"d37c1c81419fdef66ebd0747cf76fb8b7d979059","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"db6338f45971b4285ea368432a84033690eaf53c","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"65ead8468c21c2676d4d06f50b46beffdea69df1","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"4373534a9850627a2695317944898eb1283a2db0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/scsi_error.c","drivers/scsi/scsi_lib.c","drivers/scsi/scsi_priv.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.77","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.16","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.4","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/scsi_error.c","drivers/scsi/scsi_lib.c","drivers/scsi/scsi_priv.h"]}],"references":["https://git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c","https://git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059","https://git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c","https://git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1","https://git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb","https://git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0","https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"],"weaknesses":[],"ingestedAt":"2026-10-29T20:07:10.607Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2024/26xxx/CVE-2024-26627.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2024-26627","state":"PUBLISHED","datePublished":"2024-03-06T06:45:34.339Z","dateUpdated":"2026-05-11T20:01:04.897Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-19T14:20:24.135Z"},"containers":{"cna":{"title":"scsi: core: Move scsi_host_busy() out of host lock for waking up EH handler","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: core: Move scsi_host_busy() out of host lock for waking up EH handler\n\nInside scsi_eh_wakeup(), scsi_host_busy() is called & checked with host\nlock every time for deciding if error handler kthread needs to be waken up.\n\nThis can be too heavy in case of recovery, such as:\n\n - N hardware queues\n\n - queue depth is M for each hardware queue\n\n - each scsi_host_busy() iterates over (N * M) tag/requests\n\nIf recovery is triggered in case that all requests are in-flight, each\nscsi_eh_wakeup() is strictly serialized, when scsi_eh_wakeup() is called\nfor the last in-flight request, scsi_host_busy() has been run for (N * M -\n1) times, and request has been iterated for (N*M - 1) * (N * M) times.\n\nIf both N and M are big enough, hard lockup can be triggered on acquiring\nhost lock, and it is observed on mpi3mr(128 hw queues, queue depth 8169).\n\nFix the issue by calling scsi_host_busy() outside the host lock. We don't\nneed the host lock for getting busy count because host the lock never\ncovers that.\n\n[mkp: Drop unnecessary 'busy' variables pointed out by Bart]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"f5944853f7a961fedc1227dc8f60393f8936d37c","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"d37c1c81419fdef66ebd0747cf76fb8b7d979059","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"db6338f45971b4285ea368432a84033690eaf53c","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"65ead8468c21c2676d4d06f50b46beffdea69df1","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb","versionType":"git"},{"version":"6eb045e092efefafc6687409a6fa6d1dabf0fb69","status":"affected","lessThan":"4373534a9850627a2695317944898eb1283a2db0","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/scsi_error.c","drivers/scsi/scsi_lib.c","drivers/scsi/scsi_priv.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.5","versionType":"semver"},{"version":"5.10.210","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.149","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.77","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.16","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.7.4","status":"unaffected","lessThanOrEqual":"6.7.*","versionType":"semver"},{"version":"6.8","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/scsi_error.c","drivers/scsi/scsi_lib.c","drivers/scsi/scsi_priv.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/f5944853f7a961fedc1227dc8f60393f8936d37c"},{"url":"https://git.kernel.org/stable/c/d37c1c81419fdef66ebd0747cf76fb8b7d979059"},{"url":"https://git.kernel.org/stable/c/db6338f45971b4285ea368432a84033690eaf53c"},{"url":"https://git.kernel.org/stable/c/65ead8468c21c2676d4d06f50b46beffdea69df1"},{"url":"https://git.kernel.org/stable/c/07e3ca0f17f579491b5f54e9ed05173d6c1d6fcb"},{"url":"https://git.kernel.org/stable/c/4373534a9850627a2695317944898eb1283a2db0"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T20:01:04.897Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.10.210"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"5.15.149"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.1.77"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.6.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.7.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.5","versionEndExcluding":"6.8"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA 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