{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-89541", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-89541", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-11T19:44:18.188Z", "updatedAt": "2026-10-19T08:48:32.929Z", "importedAt": "2026-10-24T01:58:35.090Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "SUNRPC: harden gss_unwrap_resp_priv length checks", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: harden gss_unwrap_resp_priv length checks\n\ngss_unwrap_resp_priv() validates the RPCSEC_GSS opaque length with\n\n offset = (u8 *)(p) - (u8 *)head->iov_base;\n if (offset + opaque_len > rcv_buf->len)\n goto unwrap_failed;\n maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset,\n offset + opaque_len, rcv_buf);\n\nBoth operands are u32 and the sum is computed in u32. A reply with\nopaque_len near 0xffffffff makes offset + opaque_len wrap to a small\nvalue that is below rcv_buf->len, so the bound check passes and\ngss_unwrap() is called with end < begin. The check also lacks a\nlower bound, so any opaque_len in [0, GSS_KRB5_TOK_HDR_LEN) is\naccepted and forwarded to gss_krb5_unwrap_v2(), whose pre-decrypt\nheader reads at ptr+4 and ptr+6 then run past the token.\n\nA krb5p NFS server returning a crafted RPCSEC_GSS reply can drive\nthe client into out-of-bounds reads in gss_krb5_unwrap_v2() and the\nrotate_left() loop that follows.\n\nFix by replacing the single combined check with three guards that\nare safe in u32 arithmetic and that enforce the RFC 4121 minimum\nouter token length:\n\n if (offset > rcv_buf->len)\n goto unwrap_failed;\n if (opaque_len > rcv_buf->len - offset)\n goto unwrap_failed;\n if (opaque_len < GSS_KRB5_TOK_HDR_LEN)\n goto unwrap_failed;\n\nThe first guard makes the subtraction in the second guard\nunconditionally safe; offset is derived from a successful\nxdr_inline_decode() in the head kvec, so in practice it already\nsatisfies the bound. The floor mirrors the server-side check added\nin commit 5b757c2e57a5 (\"SUNRPC: svcauth_gss: enforce krb5 token\nminimum length\").", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "3691c4b3488d8ca046b9941e5be30c626dbbbb50" }, { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "85fa6b12e8f439739ac36ef2aad925f37c8b976a" }, { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "401f6a5b338d05bb1069ad814d9f77e3c367854f" }, { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "81fd7654a8429718adfcb2a7e03496077f547ed0" }, { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "89a15a50f84d32d4b99db86f957427fcbe20a99a" }, { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "ebcbd2523a8524c3d24e111cdbed8e271d910269" }, { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "d395c30d570ca6168f0297b191709927d1258273" }, { "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "status": "affected", "versionType": "git", "lessThan": "87831b92112c81db251d46756d65daa4f91af6a2" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.15", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.15" }, { "version": "5.10.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.221", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.109", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.50", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }