{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31464", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.097Z", "datePublished": "2026-04-22T13:53:54.970Z", "dateUpdated": "2026-08-05T12:22:45.348Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:45.348Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()\n\nA malicious or compromised VIO server can return a num_written value in the\ndiscover targets MAD response that exceeds max_targets. This value is\nstored directly in vhost->num_targets without validation, and is then used\nas the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which\nis only allocated for max_targets entries. Indices at or beyond max_targets\naccess kernel memory outside the DMA-coherent allocation. The\nout-of-bounds data is subsequently embedded in Implicit Logout and PLOGI\nMADs that are sent back to the VIO server, leaking kernel memory.\n\nFix by clamping num_written to max_targets before storing it." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - Reachable through IBM Power VIO virtual Fibre Channel CRQ/MAD responses from the backing VIO server on the same virtual I/O fabric, not through a local syscall or routable network path.\nAC:L - A malicious or compromised VIO server directly controls the `num_written` value in the Discover Targets response; no race or hard-to-control condition is required once the adapter is initialized.\nPR:N - No privilege or authentication check in the Linux guest gates this completion path; the crafted response is accepted from the configured VIO partner.\nUI:N - The vulnerable discovery flow runs during adapter initialization/reinitialization and processes the VIO server response without requiring any end-user action.\nS:U - The impact is on the guest Linux kernel/driver resources that process the malicious virtual device response; this is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - The excessive `num_written` causes out-of-bounds reads beyond the discovery buffer, and the derived values are sent back to the VIO server in Implicit Logout/PLOGI MADs, leaking kernel memory.\nI:N - The investigated bug is an out-of-bounds read used to construct outbound MAD fields; I did not find an out-of-bounds write or arbitrary kernel memory modification primitive.\nA:H - The server-controlled oversized count can drive reads far beyond the DMA-coherent allocation and create excessive target-processing work, making kernel oops, hang, or resource exhaustion plausible." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/ibmvscsi/ibmvfc.c" ], "versions": [ { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "d842348f8a00d5b1d7358f207eb34ffcf5b16df3", "status": "affected", "versionType": "git" }, { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "a007246cb6c9ebdc93dafbf63cc2d43d98f402cc", "status": "affected", "versionType": "git" }, { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89", "status": "affected", "versionType": "git" }, { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "4ed727e35b0ab17d3eeeb1e8023768396e2be161", "status": "affected", "versionType": "git" }, { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "d1466bf991b2343cf2ba8336e440c8faf3cbb780", "status": "affected", "versionType": "git" }, { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "786f10b1966e485046839f992e89f2c18cbd1983", "status": "affected", "versionType": "git" }, { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "bae4df0a643fa7f84663473aa3082a9c2ed139db", "status": "affected", "versionType": "git" }, { "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3", "lessThan": "61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/ibmvscsi/ibmvfc.c" ], "versions": [ { "version": "2.6.27", "status": "affected" }, { "version": "0", "lessThan": "2.6.27", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.6.131" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.27", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3" }, { "url": "https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc" }, { "url": "https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89" }, { "url": "https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161" }, { "url": "https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780" }, { "url": "https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983" }, { "url": "https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db" }, { "url": "https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f" } ], "title": "scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()", "x_generator": { "engine": "bippy-1.2.0" } } } }