{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89542",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89542"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "SUNRPC: harden gss_krb5_unwrap_v2 against short tokens",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: harden gss_krb5_unwrap_v2 against short tokens\n\ngss_krb5_unwrap_v2() reads the EC and RRC header fields at ptr+4 and\nptr+6 before validating that the token is at least GSS_KRB5_TOK_HDR_LEN\n(16) bytes long, and its rotate_left() helper passes buf->len - base\nto xdr_buf_subsegment() without verifying that base <= buf->len. When\na caller hands in a sub-16-byte token, or a token whose declared len\nleaves base past the end of the buffer, three distinct failures follow:\n\n    gss_krb5_unwrap_v2(offset, len, buf)\n      ptr = buf->head[0].iov_base + offset\n      ec  = *(ptr + 4)              /* OOB read on short head */\n      rrc = *(ptr + 6)              /* OOB read on short head */\n      rotate_left(offset + 16, buf, rrc)\n        xdr_buf_subsegment(buf, &subbuf,\n                           base, buf->len - base)   /* u32 wrap when base > len */\n        _rotate_left(&subbuf, shift)\n          shift %= buf->len         /* divide-by-zero when base == len */\n\nAfter decryption, the cleanup arithmetic has the same shape:\n\n    movelen = min_t(unsigned int, buf->head[0].iov_len, len);\n    movelen -= offset + GSS_KRB5_TOK_HDR_LEN + headskip;\n    BUG_ON(offset + GSS_KRB5_TOK_HDR_LEN + headskip + movelen >\n                                            buf->head[0].iov_len);\n\nThe BUG_ON re-adds the value just subtracted, so it reduces to\nmin(A, B) > A and is permanently false; it cannot catch the unsigned\nunderflow of movelen, which then drives a ~UINT_MAX-byte memmove().\n\nAdd four defense-in-depth guards inside the unwrap core so it is safe\nregardless of what its callers validate:\n\n  - reject tokens with len - offset < GSS_KRB5_TOK_HDR_LEN before\n    touching ptr+4/ptr+6;\n  - bail from rotate_left() when buf->len <= base, covering both the\n    underflow and zero-length cases;\n  - return early from _rotate_left() when buf->len is zero, so the\n    shift %= buf->len modulo cannot fault;\n  - replace the dead BUG_ON with a live check that returns\n    GSS_S_DEFECTIVE_TOKEN before the movelen subtraction.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89542"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/299d281c7225ded15b28cb861a98d818d82787fc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/84ddbc8d084c0251d534f14f5d1a7da05be56404"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/075d7cfc4df8c54cb202ba8b28420370c03ba9b6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f2591660e0eb263c9415bf0d0bb1b111e62df7a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dddcb0f4b7e27fac16a78ea9a1c8ec2e8a241087"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/806584a4b67a7233870c33e5b8f872e76dd02988"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a7894e10572d53eb10109b8d07459cc8d3435811"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6959297aaa9572783d620a226d73c3fb94494888"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - gss_krb5_unwrap_v2() is reached from nfsd RPCSEC_GSS privacy unwrap (svcauth_gss_accept \u2192 svcauth_gss_unwrap_priv \u2192 gss_unwrap) on TCP/2049 and from the NFS client gss_unwrap_resp_priv() path on a krb5p Reply, so a remote RPCSEC_GSS peer delivers the crafted wrap token over the network.\nAC:L - A single crafted RPCSEC_GSS DATA/Reply with a sub-16-byte wrap token (KG2_TOK_WRAP, sealed flags, non-zero RRC) deterministically hits the pre-decrypt ptr+4/ptr+6 reads, rotate_left() u32 wrap, and shift%=0 divide-by-zero; no race or attacker-uncontrollable layout is required.\nPR:N - A malicious NFS server on an existing krb5p session needs no account or capability on the victim client to send the crafted Reply into gss_unwrap_resp_priv(). That client-victim path is the highest-severity reachability and requires no privileges on the target.\nUI:N - nfsd unwraps the Call in the service thread with no local user action. On the client, gss_unwrap_resp_priv() runs automatically from the RPC receive path 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->len 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/rpciod, and the attacker can repeat the RPC to deny service."
    }
  }
}