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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-89539

SUNRPC: reject duplicate CREDS_VALUE options

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: reject duplicate CREDS_VALUE options gssx_dec_option_array() walks the wire-supplied option array and, for every entry whose name matches CREDS_VALUE, calls gssx_dec_linux_creds() on the same struct svc_cred. That helper unconditionally installs a fresh groups_alloc() result into creds->cr_group_info without releasing whatever pointer was already there: for (i = 0; i < count; i++) { ... decode name ... if (length == sizeof(CREDS_VALUE) && memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) { err = gssx_dec_linux_creds(xdr, creds); ... } } A reply that carries two CREDS_VALUE entries therefore overwrites cr_group_info on the second iteration and orphans the group_info allocated by the first call. The earlier free_creds path only releases the last cr_group_info via free_svc_cred(), so the first allocation's refcount stays at one and its kvmalloc-backed storage is leaked. No in-tree caller of gssp_accept_sec_context_upcall() expects more than one CREDS_VALUE per reply. Fix by tracking whether a CREDS_VALUE option has already been decoded and returning -EINVAL on any subsequent match, so the free_creds path releases the single group_info that was installed.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < 6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8affected
  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < 4904d61eb2e2bd484000725fd302b8f37b4fcf3aaffected
  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < 64b9ef369a6f723294613cb129e5f62c35429df5affected
  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < 4b5ebb4f91a6152a0f7b1253f701197e5710d4daaffected
  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < f615b884310bf82d0014e3b5a92eb9aa88146685affected
  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < 7a1d0501cbb962beba23377035d667bf3c1726eeaffected
  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < 9d94f046b23de0f77849ea69133063c949297e30affected
  • 1d658336b05f8697d6445834f8867f8ad5e4f735 to < 2e4ce62385c1b8a887c5370af058ac7b52a8eaf9affected

Linux Linux

Default version status: affected

  • 3.10affected
  • 0 to < 3.10unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.109 to ≤ 6.12.*unaffected
  • 6.18.50 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References