{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89541", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.721Z", "datePublished": "2026-09-11T19:44:18.188Z", "dateUpdated": "2026-09-11T19:44:18.188Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:44:18.188Z"}, "descriptions": [{"lang": "en", "value": "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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/auth_gss/auth_gss.c"], "versions": [{"version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "89a15a50f84d32d4b99db86f957427fcbe20a99a", "status": "affected", "versionType": "git"}, {"version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "ebcbd2523a8524c3d24e111cdbed8e271d910269", "status": "affected", "versionType": "git"}, {"version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "d395c30d570ca6168f0297b191709927d1258273", "status": "affected", "versionType": "git"}, {"version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "87831b92112c81db251d46756d65daa4f91af6a2", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sunrpc/auth_gss/auth_gss.c"], "versions": [{"version": "2.6.15", "status": "affected"}, {"version": "0", "lessThan": "2.6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "2.6.15", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.15", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.15", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.15", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a"}, {"url": "https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269"}, {"url": "https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273"}, {"url": "https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2"}], "title": "SUNRPC: harden gss_unwrap_resp_priv length checks", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/sunrpc/auth_gss/auth_gss.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "89a15a50f84d32d4b99db86f957427fcbe20a99a", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}, {"lessThan": "ebcbd2523a8524c3d24e111cdbed8e271d910269", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}, {"lessThan": "d395c30d570ca6168f0297b191709927d1258273", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}, {"lessThan": "87831b92112c81db251d46756d65daa4f91af6a2", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/sunrpc/auth_gss/auth_gss.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.15"}, {"lessThan": "2.6.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.109", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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\")."}], "id": "CVE-2026-89541", "lastModified": "2026-09-11T20:19:37.247", "metrics": {}, "published": "2026-09-11T20:19:37.247", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel (SUNRPC): Out-of-bounds read via crafted RPCSEC_GSS reply", "id": "2532224", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532224"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel. Specifically, an integer overflow vulnerability exists in the `gss_unwrap_resp_priv()` function within the SUNRPC component. This flaw occurs when validating the length of RPCSEC_GSS opaque data. A malicious krb5p Network File System (NFS) server can send a specially crafted RPCSEC_GSS reply, leading to an out-of-bounds read. This could potentially result in information disclosure or a denial of service (DoS) on the client system."], "name": "CVE-2026-89541", "public_date": "2026-09-11T19:44:18Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89541\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89541\nhttps://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2\nhttps://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a\nhttps://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273\nhttps://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269"], "threat_severity": "Important"}

{}