# CVE-2026-31464: CVE-2026-31464 Status: published. Published: 2026-04-22. Updated: 2026-11-11. In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory. Fix by clamping num_written to max_targets before storing it. ## Remediation - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3 ## Affected products and versions - linux / linux_kernel: ≥ 2.6.27; < 5.10.253 (affected, custom). Source: NVD - linux / linux_kernel: ≥ 5.11; < 5.15.203 (affected, custom). Source: NVD - linux / linux_kernel: ≥ 5.16; < 6.1.168 (affected, custom). Source: NVD - linux / linux_kernel: ≥ 6.2; < 6.6.131 (affected, custom). Source: NVD - linux / linux_kernel: ≥ 6.7; < 6.12.80 (affected, custom). Source: NVD - linux / linux_kernel: ≥ 6.13; < 6.18.21 (affected, custom). Source: NVD - linux / linux_kernel: ≥ 6.19; < 6.19.11 (affected, custom). Source: NVD - linux / linux_kernel: 7.0 (affected, custom). Source: NVD ## NVD configuration conditions Affected CPE matches depend on the following AND/OR and negation conditions: ```json [ { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.10.253", "versionStartIncluding": "2.6.27", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.11", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.1.168", "versionStartIncluding": "5.16", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.6.131", "versionStartIncluding": "6.2", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.12.80", "versionStartIncluding": "6.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.18.21", "versionStartIncluding": "6.13", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionEndExcluding": "6.19.11", "versionStartIncluding": "6.19", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" } ] ``` ## Severity and prioritization - CVSS 3.1: 8.1 (high); CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H; source: NVD: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 - CISA KEV: No listing in collected sources - EPSS: Not available - SSVC: exploitation none; automatable no; technical impact partial; source NVD SSVC: 134c704f-9b21-4f2e-91b3-4a467353bcc0 - Weaknesses: CWE-125 ## Exploit evidence No exploit evidence in collected sources. This is not proof of no exploitation. ## References - https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) - https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) - https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) - https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) - https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) - https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) - https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) - https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch) ## Provenance - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31464; retrieved 2026-11-12; source updated 2026-11-11 Revision: 8f53de1f1b2200c77a2d275cecd668439e91279e5cdbe13276d2dfc24e26e5c4 Canonical: https://y2.dev/cve/CVE-2026-31464 ## Agent and API access Public CVE pages, Markdown, and JSON are free to read without an account or API key. - Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end. - WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers. - Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}. - Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer . Setup: https://y2.dev/docs/api/create-key. - x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402. - OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json. Collected public records only. Check source status for coverage and freshness.