{"id":"CVE-2026-31464","title":"scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()","summary":"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 respons…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d842348f8a00d5b1d7358f207eb34ffcf5b16df3","Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc","Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89","Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 4ed727e35b0ab17d3eeeb1e8023768396e2be161","Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d1466bf991b2343cf2ba8336e440c8faf3cbb780","Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 786f10b1966e485046839f992e89f2c18cbd1983","Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < bae4df0a643fa7f84663473aa3082a9c2ed139db","Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f","Linux 2.6.27"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:09:42.415310Z"},"published":"2026-04-22","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:11.762Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31464","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"}],"tags":["cve.org"],"epss":0.00419,"epssPercentile":0.34712,"ingestedAt":"2026-10-16T17:24:46.655Z","slug":"CVE-2026-31464","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d842348f8a00d5b1d7358f207eb34ffcf5b16df3`\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc`\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89`\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 4ed727e35b0ab17d3eeeb1e8023768396e2be161`\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < d1466bf991b2343cf2ba8336e440c8faf3cbb780`\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 786f10b1966e485046839f992e89f2c18cbd1983`\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < bae4df0a643fa7f84663473aa3082a9c2ed139db`\n- `Linux >= 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f`\n- `Linux 2.6.27`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}