{"id":"CVE-2023-54234","state":"PUBLISHED","title":"scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization\n\nCommit c1af985d27da (\"scsi: mpi3mr: Add Event acknowledgment logic\")\nintroduced an array mrioc->evtack_cmds but initialization of the array\nelements was missed. They are just zero cleared. The function\nmpi3mr_complete_evt_ack() refers host_tag field of the elements. Due to the\nzero value of the host_tag field, the function calls clear_bit() for\nmrico->evtack_cmds_bitmap with wrong bit index. This results in memory\naccess to invalid address and \"BUG: KASAN: use-after-free\". This BUG was\nobserved at eHBA-9600 firmware update to version 8.3.1.0. To fix it, add\nthe missing initialization of mrioc->evtack_cmds.","publishedAt":"2025-12-30T12:11:25.021Z","updatedAt":"2026-10-15T21:41:42.603Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/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":"c1af985d27da2d530c22604644e9025810f57d7c","status":"affected","lessThan":"4e0dfdb48a824deac3dfbc67fb856ef2aee13529","versionType":"git"},{"version":"c1af985d27da2d530c22604644e9025810f57d7c","status":"affected","lessThan":"67989091e11a974003ddf2ec39bc613df8eadd83","versionType":"git"},{"version":"c1af985d27da2d530c22604644e9025810f57d7c","status":"affected","lessThan":"e39ea831ebad4ab15c4748cb62a397a8abcca36e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/mpi3mr/mpi3mr_os.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/mpi3mr/mpi3mr_os.c"]}],"references":["https://git.kernel.org/stable/c/4e0dfdb48a824deac3dfbc67fb856ef2aee13529","https://git.kernel.org/stable/c/67989091e11a974003ddf2ec39bc613df8eadd83","https://git.kernel.org/stable/c/e39ea831ebad4ab15c4748cb62a397a8abcca36e"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:42.242Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/54xxx/CVE-2023-54234.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-54234","state":"PUBLISHED","datePublished":"2025-12-30T12:11:25.021Z","dateUpdated":"2026-10-15T21:41:42.603Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-30T12:06:44.507Z"},"containers":{"cna":{"title":"scsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: mpi3mr: Fix missing mrioc->evtack_cmds initialization\n\nCommit c1af985d27da (\"scsi: mpi3mr: Add Event acknowledgment logic\")\nintroduced an array mrioc->evtack_cmds but initialization of the array\nelements was missed. They are just zero cleared. The function\nmpi3mr_complete_evt_ack() refers host_tag field of the elements. Due to the\nzero value of the host_tag field, the function calls clear_bit() for\nmrico->evtack_cmds_bitmap with wrong bit index. This results in memory\naccess to invalid address and \"BUG: KASAN: use-after-free\". This BUG was\nobserved at eHBA-9600 firmware update to version 8.3.1.0. To fix it, add\nthe missing initialization of mrioc->evtack_cmds."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c1af985d27da2d530c22604644e9025810f57d7c","status":"affected","lessThan":"4e0dfdb48a824deac3dfbc67fb856ef2aee13529","versionType":"git"},{"version":"c1af985d27da2d530c22604644e9025810f57d7c","status":"affected","lessThan":"67989091e11a974003ddf2ec39bc613df8eadd83","versionType":"git"},{"version":"c1af985d27da2d530c22604644e9025810f57d7c","status":"affected","lessThan":"e39ea831ebad4ab15c4748cb62a397a8abcca36e","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/mpi3mr/mpi3mr_os.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.16","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.2.3","status":"unaffected","lessThanOrEqual":"6.2.*","versionType":"semver"},{"version":"6.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/scsi/mpi3mr/mpi3mr_os.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4e0dfdb48a824deac3dfbc67fb856ef2aee13529"},{"url":"https://git.kernel.org/stable/c/67989091e11a974003ddf2ec39bc613df8eadd83"},{"url":"https://git.kernel.org/stable/c/e39ea831ebad4ab15c4748cb62a397a8abcca36e"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerability is in a Broadcom MPI3 SAS/NVMe HBA driver and is reached through local controller reset/error-recovery paths and the local BSG management interface; there is no network-facing protocol handler involved.\nAC:L - Once a PREPARE_FOR_RESET event with ACK_REQUIRED has left evtack_cmds[0] permanently PENDING, the very next controller reset deterministically executes clear_bit() at fixed index 65512, with no race to win and no memory-layout precondition; the reporter reproduced it reliably on firmware update.\nPR:L - An unprivileged local user with ordinary I/O access to storage behind the HBA can drive the controller into the timeout/fault reset paths (MPI3MR_RESET_FROM_FIRMWARE, mpi3mr_fw.c:2468-2513) that call mpi3mr_flush_drv_cmds(); no capability check guards those escalation paths, so real root is not required.\nUI:N - The corrupting code runs entirely inside driver reset handling and the admin reply/interrupt path; no victim action such as mounting a filesystem or opening a file is needed.\nS:U - The out-of-bounds write corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A wild out-of-bounds bit write 8184 bytes past an 8-byte allocation corrupts an unrelated kernel object; clearing a bit in adjacent slab state (flags, length fields, pointer bits) can be groomed into an information-disclosure primitive, and KASAN classified the access as use-after-free.\nI:H - clear_bit() performs a read-modify-write far outside the bitmap allocation, giving an out-of-bounds write into arbitrary neighbouring slab memory — per guidance an OOB write is High, and with heap grooming the corrupted victim object can yield control over kernel data.\nA:H - The out-of-bounds write silently corrupts an unrelated freed/live slab object, producing the observed KASAN use-after-free splat and leading to kernel oops or panic during controller reset."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T09:18:14.409Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.1.16"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2023-54234","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-15T21:39:35.903233Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-15T21:41:42.603Z"}}]}}}