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CVE-2026-89539: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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.

    Засегнати продукти

    • Linux Linux: 1d658336b05f8697d6445834f8867f8ad5e4f735 преди 6207d7df96b3a7f507f0bfc8842b3760ee2fb1f8; 1d658336b05f8697d6445834f8867f8ad5e4f735 преди 4904d61eb2e2bd484000725fd302b8f37b4fcf3a; 1d658336b05f8697d6445834f8867f8ad5e4f735 преди 64b9ef369a6f723294613cb129e5f62c35429df5; 1d658336b05f8697d6445834f8867f8ad5e4f735 преди 4b5ebb4f91a6152a0f7b1253f701197e5710d4da; 1d658336b05f8697d6445834f8867f8ad5e4f735 преди f615b884310bf82d0014e3b5a92eb9aa88146685; 1d658336b05f8697d6445834f8867f8ad5e4f735 преди 7a1d0501cbb962beba23377035d667bf3c1726ee; 1d658336b05f8697d6445834f8867f8ad5e4f735 преди 9d94f046b23de0f77849ea69133063c949297e30; 1d658336b05f8697d6445834f8867f8ad5e4f735 преди 2e4ce62385c1b8a887c5370af058ac7b52a8eaf9
    • Linux Linux: 3.10; преди 3.10; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

    История

    • 11 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-89539: Linux | freedomonline.bg