CVE-2026-89550 (GCVE-0-2026-89550)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:48
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: svcauth_gss: enforce krb5 token minimum length svcauth_gss_unwrap_priv() validates only an upper bound on the wire-supplied opaque length before handing the buffer to gss_unwrap(): if (len > xdr_stream_remaining(xdr)) goto unwrap_failed; offset = xdr_stream_pos(xdr); ... maj_stat = gss_unwrap(ctx, offset, offset + len, buf); The wire value `len` flows unchanged as the upper bound into the krb5 unwrap path, so a len in [0, 16] passes this check and is handed to gss_unwrap(). For a krb5 v2 context that lands in gss_krb5_unwrap_v2(), which reads the 16-byte RFC 4121 token header fields at ptr+4 and ptr+6 and then calls rotate_left() before any integrity check. With a sub-header length the header reads run past the token, and _rotate_left()'s `shift %= buf->len` path can divide by zero when buf->len has been driven to zero by the truncated token. A header-only token (len == 16) is equally invalid: with a non-zero RRC field and the opaque blob ending at the XDR buffer boundary, rotate_left() builds a zero-length subbuffer, reaching the same division. Reject the token at the server entry point before it reaches the krb5 unwrap core. A valid sealed RFC 4121 token must contain the 16-byte header plus at least some encrypted payload. Fix by adding a minimum-length check immediately after the existing upper-bound check: if (len <= GSS_KRB5_TOK_HDR_LEN) goto unwrap_failed;
References
Impacted products
Vendor Product Version
Linux Linux Version: 7c9fdcfb1b64c47ed618c103b617af3f86e1239c
Version: 7c9fdcfb1b64c47ed618c103b617af3f86e1239c
Version: 7c9fdcfb1b64c47ed618c103b617af3f86e1239c
Version: 7c9fdcfb1b64c47ed618c103b617af3f86e1239c
Version: 7c9fdcfb1b64c47ed618c103b617af3f86e1239c
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: svcauth_gss: enforce krb5 token minimum length\n\nsvcauth_gss_unwrap_priv() validates only an upper bound on the\nwire-supplied opaque length before handing the buffer to\ngss_unwrap():\n\n    if (len \u003e xdr_stream_remaining(xdr))\n            goto unwrap_failed;\n    offset = xdr_stream_pos(xdr);\n    ...\n    maj_stat = gss_unwrap(ctx, offset, offset + len, buf);\n\nThe wire value `len` flows unchanged as the upper bound into the\nkrb5 unwrap path, so a len in [0, 16] passes this check and is\nhanded to gss_unwrap(). For a krb5 v2 context that lands in\ngss_krb5_unwrap_v2(), which reads the 16-byte RFC 4121 token\nheader fields at ptr+4 and ptr+6 and then calls rotate_left()\nbefore any integrity check. With a sub-header length the header\nreads run past the token, and _rotate_left()\u0027s `shift %= buf-\u003elen`\npath can divide by zero when buf-\u003elen has been driven to zero by\nthe truncated token. A header-only token (len == 16) is equally\ninvalid: with a non-zero RRC field and the opaque blob ending at\nthe XDR buffer boundary, rotate_left() builds a zero-length\nsubbuffer, reaching the same division.\n\nReject the token at the server entry point before it reaches the\nkrb5 unwrap core. A valid sealed RFC 4121 token must contain\nthe 16-byte header plus at least some encrypted payload.\n\nFix by adding a minimum-length check immediately after the\nexisting upper-bound check:\n\n    if (len \u003c= GSS_KRB5_TOK_HDR_LEN)\n            goto unwrap_failed;"
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              "value": "AV:N - svcauth_gss_unwrap_priv() is reached from in-kernel nfsd over TCP/2049 (svc_authenticate \u2192 svcauth_gss_accept) and from the NFSv4.0 RPC_AUTH_GSS callback service, so a remote RPCSEC_GSS peer delivers the short krb5 wrap token over the network.\nAC:L - A single RPCSEC_GSS DATA Call with gc_svc=PRIVACY and opaque length in [0, 16] plus a non-zero RRC in the cleartext RFC 4121 header deterministically hits gss_krb5_unwrap_v2() rotate_left() u32 wrap and shift%=0; no race or attacker-uncontrollable layout is required.\nPR:N - A malicious NFS server that already shares a krb5p GSS context can send a crafted NFSv4.0 GSS callback into the client\u0027s svcauth_gss_unwrap_priv() with no account or capability on the victim. That peer path is the highest-severity reachability.\nUI:N - nfsd unwraps the Call in the service thread with no local user action. On the client, the NFSv4.0 GSS callback path runs from the callback service thread once an NFS/RPCSEC_GSS mount exists; no additional mount, click, or open is required at attack time.\nS:U - The out-of-bounds accesses, divide-by-zero, and underflowed memmove corrupt host kernel SUNRPC/GSS state on the machine processing the RPC. This is ordinary same-host kernel impact, not a VM escape, IOMMU bypass, or other changed-scope boundary.\nC:H - Short tokens make gss_krb5_unwrap_v2() read EC/RRC past the token, and the dead BUG_ON lets unsigned movelen underflow into a ~UINT_MAX-byte memmove that copies kernel memory beyond the receive head; that unbounded read is C:H per kernel CNA memory-corruption guidance.\nI:H - The same underflowed memmove() writes near 4GiB through the RPC receive head, an out-of-bounds write exploitable for control-flow hijack. rotate_left() also ignores xdr_buf_subsegment() failure after u32 wrap and then writes through a subbuf whose length has wrapped.\nA:H - _rotate_left() does shift %= buf-\u003elen on a zero-length subbuffer (header-only token at the XDR boundary), a divide-by-zero oops/panic; the UINT_MAX memmove and wrapped-length rotate loop hang or oops nfsd/callback threads, and the attacker can repeat the RPC to deny service."
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    "dateUpdated": "2026-10-19T08:48:43.080Z",
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That peer path is the highest-severity reachability.\\nUI:N - nfsd unwraps the Call in the service thread with no local user action. On the client, the NFSv4.0 GSS callback path runs from the callback service thread once an NFS/RPCSEC_GSS mount exists; no additional mount, click, or open is required at attack time.\\nS:U - The out-of-bounds accesses, divide-by-zero, and underflowed memmove corrupt host kernel SUNRPC/GSS state on the machine processing the RPC. This is ordinary same-host kernel impact, not a VM escape, IOMMU bypass, or other changed-scope boundary.\\nC:H - Short tokens make gss_krb5_unwrap_v2() read EC/RRC past the token, and the dead BUG_ON lets unsigned movelen underflow into a ~UINT_MAX-byte memmove that copies kernel memory beyond the receive head; that unbounded read is C:H per kernel CNA memory-corruption guidance.\\nI:H - The same underflowed memmove() writes near 4GiB through the RPC receive head, an out-of-bounds write exploitable for control-flow hijack. rotate_left() also ignores xdr_buf_subsegment() failure after u32 wrap and then writes through a subbuf whose length has wrapped.\\nA:H - _rotate_left() does shift %= buf-\u003elen on a zero-length subbuffer (header-only token at the XDR boundary), a divide-by-zero oops/panic; the UINT_MAX memmove and wrapped-length rotate loop hang or oops nfsd/callback threads, and the attacker can repeat the RPC to deny service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7c9fdcfb1b64c47ed618c103b617af3f86e1239c\", \"lessThan\": \"0ea5b0c7f212c2772d32c2b88287b89a9cdf6edd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c9fdcfb1b64c47ed618c103b617af3f86e1239c\", \"lessThan\": \"dd6afc6cab8c5d387d1ed2f069562ef7bdadd651\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c9fdcfb1b64c47ed618c103b617af3f86e1239c\", \"lessThan\": \"de942dd8c2c8358bcad04ce44271954c48924423\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c9fdcfb1b64c47ed618c103b617af3f86e1239c\", \"lessThan\": \"2eed1e6a976a44015c3ee78841fe336796e2b21c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7c9fdcfb1b64c47ed618c103b617af3f86e1239c\", \"lessThan\": \"a919c5c88769cf8fb3ec071e6078d830bf512489\", \"versionType\": \"git\"}], \"programFiles\": [\"net/sunrpc/auth_gss/svcauth_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\": \"2.6.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.18\", \"versionType\": \"semver\"}, {\"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/svcauth_gss.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/0ea5b0c7f212c2772d32c2b88287b89a9cdf6edd\"}, {\"url\": \"https://git.kernel.org/stable/c/dd6afc6cab8c5d387d1ed2f069562ef7bdadd651\"}, {\"url\": \"https://git.kernel.org/stable/c/de942dd8c2c8358bcad04ce44271954c48924423\"}, {\"url\": \"https://git.kernel.org/stable/c/2eed1e6a976a44015c3ee78841fe336796e2b21c\"}, {\"url\": \"https://git.kernel.org/stable/c/a919c5c88769cf8fb3ec071e6078d830bf512489\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nSUNRPC: svcauth_gss: enforce krb5 token minimum length\\n\\nsvcauth_gss_unwrap_priv() validates only an upper bound on the\\nwire-supplied opaque length before handing the buffer to\\ngss_unwrap():\\n\\n    if (len \u003e xdr_stream_remaining(xdr))\\n            goto unwrap_failed;\\n    offset = xdr_stream_pos(xdr);\\n    ...\\n    maj_stat = gss_unwrap(ctx, offset, offset + len, buf);\\n\\nThe wire value `len` flows unchanged as the upper bound into the\\nkrb5 unwrap path, so a len in [0, 16] passes this check and is\\nhanded to gss_unwrap(). For a krb5 v2 context that lands in\\ngss_krb5_unwrap_v2(), which reads the 16-byte RFC 4121 token\\nheader fields at ptr+4 and ptr+6 and then calls rotate_left()\\nbefore any integrity check. With a sub-header length the header\\nreads run past the token, and _rotate_left()\u0027s `shift %= buf-\u003elen`\\npath can divide by zero when buf-\u003elen has been driven to zero by\\nthe truncated token. A header-only token (len == 16) is equally\\ninvalid: with a non-zero RRC field and the opaque blob ending at\\nthe XDR buffer boundary, rotate_left() builds a zero-length\\nsubbuffer, reaching the same division.\\n\\nReject the token at the server entry point before it reaches the\\nkrb5 unwrap core. A valid sealed RFC 4121 token must contain\\nthe 16-byte header plus at least some encrypted payload.\\n\\nFix by adding a minimum-length check immediately after the\\nexisting upper-bound check:\\n\\n    if (len \u003c= GSS_KRB5_TOK_HDR_LEN)\\n            goto unwrap_failed;\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"2.6.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:48:43.080Z\"}}}",
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}


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