CVE-2026-89541

{"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": "2026-10-19T08:48:32.929Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:32.929Z"}, "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\")."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - gss_unwrap_resp_priv() runs in the Linux NFS/SUNRPC client while decoding RPCSEC_GSS privacy (krb5p) replies; a malicious or compromised NFS server supplies the crafted opaque_len and wrap token over the existing TCP/UDP/RDMA RPC connection.\nAC:L - The attacker fully controls the reply, including opaque_len and the cleartext RFC 4121 header, and a single response can make offset+opaque_len wrap in u32 or fall below GSS_KRB5_TOK_HDR_LEN; no race or layout beyond the attacker\u2019s control is required.\nPR:N - The attacker is the remote RPC/NFS peer that already holds the GSS session keys needed to pass gss_validate(); no local account, user namespace, or capability on the victim client is required.\nUI:N - Once a krb5p NFS mount or other SUNRPC GSS-privacy client is already in use, normal client RPCs elicit replies the attacker can craft; no extra victim action is needed at attack time.\nS:U - Out-of-bounds reads, rotate/decrypt memory corruption, and crashes stay inside the victim kernel\u2019s SUNRPC client and do not cross a VM, IOMMU, or other security-authority boundary.\nC:H - A short or wrapped opaque_len makes gss_krb5_unwrap_v2() read past the token at ptr+4/ptr+6 and feeds rotate_left()/decrypt with wrapped lengths, disclosing adjacent kernel memory; unwrap cleanup can also memmove nearly UINT_MAX bytes.\nI:H - The same wrapped lengths drive rotate_left() writes, CBC/AEAD decrypt over an unbounded xdr subsegment (xdr_buf_subsegment\u2019s error is ignored), and gss_krb5_unwrap_v2()\u2019s unsigned movelen underflow into a near-4GiB memmove, enabling kernel memory corruption.\nA:H - rotate_left() can divide-by-zero on a zero-length subbuffer, spin in a multi-gigabyte kernel loop on a wrapped subsegment, or oops/panic on the huge memmove or out-of-bounds header access."}]}], "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": "3691c4b3488d8ca046b9941e5be30c626dbbbb50", "status": "affected", "versionType": "git"}, {"version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "85fa6b12e8f439739ac36ef2aad925f37c8b976a", "status": "affected", "versionType": "git"}, {"version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "401f6a5b338d05bb1069ad814d9f77e3c367854f", "status": "affected", "versionType": "git"}, {"version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "81fd7654a8429718adfcb2a7e03496077f547ed0", "status": "affected", "versionType": "git"}, {"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": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.157", "lessThanOrEqual": "6.6.*", "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", "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": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.15", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.15", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.15", "versionEndExcluding": "6.6.157"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50"}, {"url": "https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a"}, {"url": "https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f"}, {"url": "https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0"}, {"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"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89541", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:27.526748Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:42.189Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89541", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:23:27.526748Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:23:28.611Z"}}], "cna": {"title": "SUNRPC: harden gss_unwrap_resp_priv length checks", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - gss_unwrap_resp_priv() runs in the Linux NFS/SUNRPC client while decoding RPCSEC_GSS privacy (krb5p) replies; a malicious or compromised NFS server supplies the crafted opaque_len and wrap token over the existing TCP/UDP/RDMA RPC connection.\nAC:L - The attacker fully controls the reply, including opaque_len and the cleartext RFC 4121 header, and a single response can make offset+opaque_len wrap in u32 or fall below GSS_KRB5_TOK_HDR_LEN; no race or layout beyond the attacker\u2019s control is required.\nPR:N - The attacker is the remote RPC/NFS peer that already holds the GSS session keys needed to pass gss_validate(); no local account, user namespace, or capability on the victim client is required.\nUI:N - Once a krb5p NFS mount or other SUNRPC GSS-privacy client is already in use, normal client RPCs elicit replies the attacker can craft; no extra victim action is needed at attack time.\nS:U - Out-of-bounds reads, rotate/decrypt memory corruption, and crashes stay inside the victim kernel\u2019s SUNRPC client and do not cross a VM, IOMMU, or other security-authority boundary.\nC:H - A short or wrapped opaque_len makes gss_krb5_unwrap_v2() read past the token at ptr+4/ptr+6 and feeds rotate_left()/decrypt with wrapped lengths, disclosing adjacent kernel memory; unwrap cleanup can also memmove nearly UINT_MAX bytes.\nI:H - The same wrapped lengths drive rotate_left() writes, CBC/AEAD decrypt over an unbounded xdr subsegment (xdr_buf_subsegment\u2019s error is ignored), and gss_krb5_unwrap_v2()\u2019s unsigned movelen underflow into a near-4GiB memmove, enabling kernel memory corruption.\nA:H - rotate_left() can divide-by-zero on a zero-length subbuffer, spin in a multi-gigabyte kernel loop on a wrapped subsegment, or oops/panic on the huge memmove or out-of-bounds header access."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "3691c4b3488d8ca046b9941e5be30c626dbbbb50", "versionType": "git"}, {"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "85fa6b12e8f439739ac36ef2aad925f37c8b976a", "versionType": "git"}, {"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "401f6a5b338d05bb1069ad814d9f77e3c367854f", "versionType": "git"}, {"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "81fd7654a8429718adfcb2a7e03496077f547ed0", "versionType": "git"}, {"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "89a15a50f84d32d4b99db86f957427fcbe20a99a", "versionType": "git"}, {"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "ebcbd2523a8524c3d24e111cdbed8e271d910269", "versionType": "git"}, {"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "d395c30d570ca6168f0297b191709927d1258273", "versionType": "git"}, {"status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "lessThan": "87831b92112c81db251d46756d65daa4f91af6a2", "versionType": "git"}], "programFiles": ["net/sunrpc/auth_gss/auth_gss.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.15"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.270", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.221", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.188", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.157", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.109", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.50", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.2.4", "versionType": "semver", "lessThanOrEqual": "7.2.*"}, {"status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sunrpc/auth_gss/auth_gss.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50"}, {"url": "https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a"}, {"url": "https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f"}, {"url": "https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0"}, {"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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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\")."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.270", "versionStartIncluding": "2.6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.221", "versionStartIncluding": "2.6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.188", "versionStartIncluding": "2.6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.157", "versionStartIncluding": "2.6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.109", "versionStartIncluding": "2.6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.50", "versionStartIncluding": "2.6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2.4", "versionStartIncluding": "2.6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.3", "versionStartIncluding": "2.6.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:48:32.929Z"}}}, "cveMetadata": {"cveId": "CVE-2026-89541", "state": "PUBLISHED", "dateUpdated": "2026-10-19T08:48:32.929Z", "dateReserved": "2026-09-11T19:38:34.721Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-09-11T19:44:18.188Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"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": "3691c4b3488d8ca046b9941e5be30c626dbbbb50", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}, {"lessThan": "85fa6b12e8f439739ac36ef2aad925f37c8b976a", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}, {"lessThan": "401f6a5b338d05bb1069ad814d9f77e3c367854f", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}, {"lessThan": "81fd7654a8429718adfcb2a7e03496077f547ed0", "status": "affected", "version": "2d2da60c63b67174add32f06e8d54c3a0c5cd9cf", "versionType": "git"}, {"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": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "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", "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": "2026-10-19T09:17:48.983", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89541", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:23:27.526748Z", "version": "2.0.3"}}]}, "published": "2026-09-11T20:19:37.247", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a"}, {"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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2d2da60c63b67174add32f06e8d54c3a0c5cd9cf,89a15a50f84d32d4b99db86f957427fcbe20a99a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2d2da60c63b67174add32f06e8d54c3a0c5cd9cf,ebcbd2523a8524c3d24e111cdbed8e271d910269)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2d2da60c63b67174add32f06e8d54c3a0c5cd9cf,d395c30d570ca6168f0297b191709927d1258273)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[2d2da60c63b67174add32f06e8d54c3a0c5cd9cf,87831b92112c81db251d46756d65daa4f91af6a2)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "2.6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.109,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T04:30:07.742116+00:00", "updated": "2026-09-15T22:15:17.690499+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}