SUNRPC: reject duplicate CREDS_VALUE options

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89539
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:36 UTC
Updated2026-09-11 20:19:36 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1d658336b05f8697d6445834f8867f8ad5e4f735 f615b884310bf82d0014e3b5a92eb9aa88146685 git Not specified
CNA Linux Linux affected 1d658336b05f8697d6445834f8867f8ad5e4f735 7a1d0501cbb962beba23377035d667bf3c1726ee git Not specified
CNA Linux Linux affected 1d658336b05f8697d6445834f8867f8ad5e4f735 9d94f046b23de0f77849ea69133063c949297e30 git Not specified
CNA Linux Linux affected 1d658336b05f8697d6445834f8867f8ad5e4f735 2e4ce62385c1b8a887c5370af058ac7b52a8eaf9 git Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f615b884310bf82d0014e3b5a92eb9aa88146685 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9d94f046b23de0f77849ea69133063c949297e30 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a1d0501cbb962beba23377035d667bf3c1726ee 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2e4ce62385c1b8a887c5370af058ac7b52a8eaf9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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