CVE-2026-89538 (GCVE-0-2026-89538)
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: Reject krb5 v2 wrap tokens with oversized ec field gss_krb5_unwrap_v2() sets buf->len to a logical length, which can be much smaller than head[0].iov_len (the allocated receive-page capacity). It then calls xdr_buf_trim() with a trim length derived from the 16-bit "extra count" (ec) field in the Kerberos v2 token header. The ec field is authenticated by the post-decrypt memcmp() against the encrypted header copy, so a randomly-mutated value is rejected. However, any peer holding a valid GSS context can legitimately encrypt a token whose ec exceeds the plaintext length. Per RFC 4121, such a token is structurally malformed. Although xdr_buf_trim() now clamps the buf->len subtraction to avoid unsigned underflow, the buffer is still left in a semantically invalid state (zero length, inconsistent iov lengths) when ec is oversized. Reject these tokens before calling xdr_buf_trim(), giving callers a well-defined GSS_S_DEFECTIVE_TOKEN error and keeping the xdr_buf internally consistent. The wrapped blob begins at a nonzero offset -- both callers pass len as offset + opaque_len -- so buf->len still counts the offset bytes that precede the blob. Compare the trim length against the remaining wrapped segment, buf->len - offset, rather than the whole buffer; comparing against buf->len alone leaves an offset-wide window in which an oversized ec passes the test and xdr_buf_trim() cuts into the bytes ahead of the blob.
References
Impacted products
Vendor Product Version
Linux Linux Version: cf4c024b908353fcc48309374d39e3399d67dfd1
Version: cf4c024b908353fcc48309374d39e3399d67dfd1
Version: cf4c024b908353fcc48309374d39e3399d67dfd1
Version: cf4c024b908353fcc48309374d39e3399d67dfd1
Version: cf4c024b908353fcc48309374d39e3399d67dfd1
Version: cf4c024b908353fcc48309374d39e3399d67dfd1
Version: cf4c024b908353fcc48309374d39e3399d67dfd1
Version: cf4c024b908353fcc48309374d39e3399d67dfd1
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It then calls\\nxdr_buf_trim() with a trim length derived from the 16-bit\\n\\\"extra count\\\" (ec) field in the Kerberos v2 token header.\\n\\nThe ec field is authenticated by the post-decrypt memcmp()\\nagainst the encrypted header copy, so a randomly-mutated\\nvalue is rejected.  However, any peer holding a valid GSS\\ncontext can legitimately encrypt a token whose ec exceeds\\nthe plaintext length.  Per RFC 4121, such a token is\\nstructurally malformed.\\n\\nAlthough xdr_buf_trim() now clamps the buf-\u003elen subtraction\\nto avoid unsigned underflow, the buffer is still left in a\\nsemantically invalid state (zero length, inconsistent iov\\nlengths) when ec is oversized.\\n\\nReject these tokens before calling xdr_buf_trim(), giving\\ncallers a well-defined GSS_S_DEFECTIVE_TOKEN error and\\nkeeping the xdr_buf internally consistent.  The wrapped blob\\nbegins at a nonzero offset -- both callers pass len as\\noffset + opaque_len -- so buf-\u003elen still counts the offset\\nbytes that precede the blob.  Compare the trim length\\nagainst the remaining wrapped segment, buf-\u003elen - offset,\\nrather than the whole buffer; comparing against buf-\u003elen\\nalone leaves an offset-wide window in which an oversized ec\\npasses the test and xdr_buf_trim() cuts into the bytes ahead\\nof the blob.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"3.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"3.13\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:48:29.976Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89538\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:48:29.976Z\", \"dateReserved\": \"2026-09-11T19:38:34.721Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:44:15.953Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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