CVE-2026-89539
Low risk· EPSS 6%Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel, gssx_dec_option_array() in the SUNRPC subsystem does not reject duplicate CREDS_VALUE options. Each CREDS_VALUE entry triggers gssx_dec_linux_creds(), which overwrites creds->cr_group_info without releasing the previous allocation, causing a memory leak. A reply containing two CREDS_VALUE entries is sufficient to leak the first group_info allocation.
Risk Assessment
Repeated triggering can lead to kernel memory exhaustion and denial of service (DoS). Requires the ability to send a crafted reply in the GSSX protocol.
Recommendation
Update the Linux kernel to a version containing the fix that tracks whether a CREDS_VALUE option has already been decoded and returns -EINVAL on any subsequent match.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS