Backport patch to fix CVE-2026-42012. References: https://nvd.nist.gov/vuln/detail/CVE-2026-42012
Upstream fix: https://gitlab.com/gnutls/gnutls/-/commit/8dcc6a1f48945997666ac9f10896819edd01a03b Tested with ptest Pre patches taken from upstream so CVE fix will land cleanly Signed-off-by: Jakub Szczudlo <[email protected]> --- .../gnutls/gnutls/CVE-2026-42012-pre1.patch | 70 ++++++++ .../gnutls/gnutls/CVE-2026-42012-pre2.patch | 153 ++++++++++++++++++ .../gnutls/gnutls/CVE-2026-42012.patch | 48 ++++++ meta/recipes-support/gnutls/gnutls_3.8.12.bb | 3 + 4 files changed, 274 insertions(+) create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre1.patch create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre2.patch create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-42012.patch diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre1.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre1.patch new file mode 100644 index 0000000000..1149dafef2 --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre1.patch @@ -0,0 +1,70 @@ +Backport of: + +From 6133fb459b74a9dcfa2d0ff010a4e03c56822d39 Mon Sep 17 00:00:00 2001 +From: Alexander Sosedkin <[email protected]> +Date: Fri, 13 Mar 2026 17:00:03 +0100 +Subject: [PATCH] x509/hostname-verify: refactor and simplify CN fallback logic + +Signed-off-by: Alexander Sosedkin <[email protected]> +CVE: CVE-2026-42012 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/6133fb459b74a9dcfa2d0ff010a4e03c56822d39] + +Signed-off-by: Jakub Szczudlo <[email protected]> +--- + lib/x509/hostname-verify.c | 15 ++++++--------- + 1 file changed, 6 insertions(+), 9 deletions(-) + +--- a/lib/x509/hostname-verify.c ++++ b/lib/x509/hostname-verify.c +@@ -108,7 +108,7 @@ unsigned gnutls_x509_crt_check_ip(gnutls + * that we do not fallback to CN-ID if we encounter a supported name + * type. + */ +-#define IS_SAN_SUPPORTED(san) \ ++#define PRECLUDES_CN_FALLBACK(san) \ + (san == GNUTLS_SAN_DNSNAME || san == GNUTLS_SAN_IPADDRESS) + + /** +@@ -151,13 +151,12 @@ unsigned gnutls_x509_crt_check_hostname2 + { + char dnsname[MAX_CN]; + size_t dnsnamesize; +- int found_dnsname = 0; + int ret = 0; + int i = 0; + struct in_addr ipv4; + char *p = NULL; + char *a_hostname; +- unsigned have_other_addresses = 0; ++ bool cn_fallback_allowed = true; + gnutls_datum_t out; + + /* check whether @hostname is an ip address */ +@@ -213,9 +212,10 @@ hostname_fallback: + ret = gnutls_x509_crt_get_subject_alt_name(cert, i, dnsname, + &dnsnamesize, NULL); + +- if (ret == GNUTLS_SAN_DNSNAME) { +- found_dnsname = 1; ++ if (PRECLUDES_CN_FALLBACK(ret)) ++ cn_fallback_allowed = false; + ++ if (ret == GNUTLS_SAN_DNSNAME) { + if (memchr(dnsname, '\0', dnsnamesize)) { + _gnutls_debug_log( + "certificate has %s with embedded null in name\n", +@@ -236,13 +236,10 @@ hostname_fallback: + ret = 1; + goto cleanup; + } +- } else { +- if (IS_SAN_SUPPORTED(ret)) +- have_other_addresses = 1; + } + } + +- if (!have_other_addresses && !found_dnsname && ++ if (cn_fallback_allowed && + _gnutls_check_key_purpose(cert, GNUTLS_KP_TLS_WWW_SERVER, 0) != 0) { + /* did not get the necessary extension, use CN instead, if the + * certificate would have been acceptable for a TLS WWW server purpose. diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre2.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre2.patch new file mode 100644 index 0000000000..c192a144c0 --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-42012-pre2.patch @@ -0,0 +1,153 @@ +Backport of: + +From 5cc003b9688378f6c7934b1df0aa147e80006be4 Mon Sep 17 00:00:00 2001 +From: Alexander Sosedkin <[email protected]> +Date: Fri, 13 Mar 2026 17:41:33 +0100 +Subject: [PATCH] x509: add bare-bones awareness of SRV virtual SAN + +There's no support for constraints, no certtool support, no nothing. +Just added what's easy to add because I needed a virtual SAN for them. + +Signed-off-by: Alexander Sosedkin <[email protected]> +CVE: CVE-2026-42012 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/5cc003b9688378f6c7934b1df0aa147e80006be4] + +Signed-off-by: Jakub Szczudlo <[email protected]> +--- + lib/includes/gnutls/gnutls.h.in | 4 +++- + lib/x509/common.h | 1 + + lib/x509/name_constraints.c | 3 ++- + lib/x509/output.c | 6 ++++++ + lib/x509/virt-san.c | 23 +++++++++++++++++++++++ + lib/x509/x509.c | 3 ++- + 6 files changed, 37 insertions(+), 3 deletions(-) + +--- a/lib/includes/gnutls/gnutls.h.in ++++ b/lib/includes/gnutls/gnutls.h.in +@@ -2698,6 +2698,7 @@ void gnutls_psk_set_server_params_functi + * @GNUTLS_SAN_OTHERNAME_XMPP: Virtual SAN, used by certain functions for convenience. + * @GNUTLS_SAN_OTHERNAME_KRB5PRINCIPAL: Virtual SAN, used by certain functions for convenience. + * @GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL: Virtual SAN, used by certain functions for convenience. ++ * @GNUTLS_SAN_OTHERNAME_SRV: Virtual SAN, used by certain functions for convenience. + * + * Enumeration of different subject alternative names types. + */ +@@ -2715,7 +2716,8 @@ typedef enum gnutls_x509_subject_alt_nam + Used by gnutls_x509_crt_get_subject_alt_othername_oid. */ + GNUTLS_SAN_OTHERNAME_XMPP = 1000, + GNUTLS_SAN_OTHERNAME_KRB5PRINCIPAL, +- GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL ++ GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL, ++ GNUTLS_SAN_OTHERNAME_SRV + } gnutls_x509_subject_alt_name_t; + + struct gnutls_openpgp_crt_int; +--- a/lib/x509/common.h ++++ b/lib/x509/common.h +@@ -107,6 +107,7 @@ + #define XMPP_OID "1.3.6.1.5.5.7.8.5" + #define KRB5_PRINCIPAL_OID "1.3.6.1.5.2.2" + #define MSUSER_PRINCIPAL_NAME_OID "1.3.6.1.4.1.311.20.2.3" ++#define SRV_OID "1.3.6.1.5.5.7.8.7" + #define PKIX1_RSA_PSS_MGF1_OID "1.2.840.113549.1.1.8" + #define PKIX1_RSA_OAEP_P_SPECIFIED_OID "1.9" + +--- a/lib/x509/name_constraints.c ++++ b/lib/x509/name_constraints.c +@@ -516,7 +516,8 @@ static int validate_name_constraints_nod + if (type != GNUTLS_SAN_DNSNAME && type != GNUTLS_SAN_RFC822NAME && + type != GNUTLS_SAN_DN && type != GNUTLS_SAN_URI && + type != GNUTLS_SAN_IPADDRESS && +- type != GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL) { ++ type != GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL && ++ type != GNUTLS_SAN_OTHERNAME_SRV) { + return gnutls_assert_val(GNUTLS_E_X509_UNKNOWN_SAN); + } + +--- a/lib/x509/output.c ++++ b/lib/x509/output.c +@@ -121,6 +121,7 @@ static void print_name(gnutls_buffer_st + if ((type == GNUTLS_SAN_DNSNAME || type == GNUTLS_SAN_OTHERNAME_XMPP || + type == GNUTLS_SAN_OTHERNAME_KRB5PRINCIPAL || + type == GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL || ++ type == GNUTLS_SAN_OTHERNAME_SRV || + type == GNUTLS_SAN_RFC822NAME || type == GNUTLS_SAN_URI) && + sname != NULL && strlen(sname) != name->size) { + adds(str, _("warning: SAN contains an embedded NUL, " +@@ -180,6 +181,11 @@ static void print_name(gnutls_buffer_st + name->size, NON_NULL(name->data)); + break; + ++ case GNUTLS_SAN_OTHERNAME_SRV: ++ addf(str, _("%sSRVName: %.*s\n"), prefix, name->size, ++ NON_NULL(name->data)); ++ break; ++ + default: + addf(str, _("%sUnknown name: "), prefix); + _gnutls_buffer_hexprint(str, name->data, name->size); +--- a/lib/x509/virt-san.c ++++ b/lib/x509/virt-san.c +@@ -45,6 +45,9 @@ static int san_othername_to_virtual(cons + memcmp(oid, MSUSER_PRINCIPAL_NAME_OID, + sizeof(MSUSER_PRINCIPAL_NAME_OID) - 1) == 0) + return GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL; ++ else if ((unsigned)size == (sizeof(SRV_OID) - 1) && ++ memcmp(oid, SRV_OID, sizeof(SRV_OID) - 1) == 0) ++ return GNUTLS_SAN_OTHERNAME_SRV; + } + + return GNUTLS_SAN_OTHERNAME; +@@ -59,6 +62,8 @@ static const char *virtual_to_othername_ + return KRB5_PRINCIPAL_OID; + case GNUTLS_SAN_OTHERNAME_MSUSERPRINCIPAL: + return MSUSER_PRINCIPAL_NAME_OID; ++ case GNUTLS_SAN_OTHERNAME_SRV: ++ return SRV_OID; + default: + return NULL; + } +@@ -126,6 +131,15 @@ int _gnutls_alt_name_assign_virt_type(st + name->type = GNUTLS_SAN_OTHERNAME; + break; + ++ case GNUTLS_SAN_OTHERNAME_SRV: ++ ret = _gnutls_x509_encode_string(ASN1_ETYPE_IA5_STRING, ++ san->data, san->size, ++ &encoded); ++ if (ret < 0) ++ return gnutls_assert_val(ret); ++ name->san = _gnutls_steal_datum(&encoded); ++ break; ++ + default: + return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST); + } +@@ -187,6 +201,15 @@ int gnutls_x509_othername_to_virtual(con + othername->data, + othername->size, virt, 0); + if (ret < 0) { ++ gnutls_assert(); ++ return ret; ++ } ++ return 0; ++ case GNUTLS_SAN_OTHERNAME_SRV: ++ ret = _gnutls_x509_decode_string(ASN1_ETYPE_IA5_STRING, ++ othername->data, ++ othername->size, virt, 0); ++ if (ret < 0) { + gnutls_assert(); + return ret; + } +--- a/lib/x509/x509.c ++++ b/lib/x509/x509.c +@@ -1562,7 +1562,8 @@ inline static int is_type_printable(int + { + if (type == GNUTLS_SAN_DNSNAME || type == GNUTLS_SAN_RFC822NAME || + type == GNUTLS_SAN_URI || type == GNUTLS_SAN_OTHERNAME_XMPP || +- type == GNUTLS_SAN_OTHERNAME || type == GNUTLS_SAN_REGISTERED_ID) ++ type == GNUTLS_SAN_OTHERNAME_SRV || type == GNUTLS_SAN_OTHERNAME || ++ type == GNUTLS_SAN_REGISTERED_ID) + return 1; + else + return 0; diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-42012.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-42012.patch new file mode 100644 index 0000000000..1f43efc122 --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-42012.patch @@ -0,0 +1,48 @@ +From 8dcc6a1f48945997666ac9f10896819edd01a03b Mon Sep 17 00:00:00 2001 +From: Alexander Sosedkin <[email protected]> +Date: Fri, 13 Mar 2026 17:02:07 +0100 +Subject: [PATCH] x509/hostname-verify: make URI/SRV SAN preclude CN fallback + +URI/SRV SAN did not suppress CN fallback as required by RFC 6125 6.4.4: +> a client MUST NOT seek a match for a reference identifier of CN-ID +> if the presented identifiers include a DNS-ID, *SRV-ID*, *URI-ID*, +> or any application-specific identifier types supported by the client. + +With this change, certificates containing URI or SRV SAN +no longer pass DNS hostname checks via CN fallback +to avoid potential misuse of such certificates +beyond their original purpose. + +Reported-by: Oleh Konko <[email protected]> +Fixes: #1802 +Fixes: CVE-2026-42012 +Fixes: GNUTLS-SA-2026-04-29-7 +CVSS: 6.5 Medium CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N +Signed-off-by: Alexander Sosedkin <[email protected]> +CVE: CVE-2026-42012 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/8dcc6a1f48945997666ac9f10896819edd01a03b] + +Signed-off-by: Jakub Szczudlo <[email protected]> +--- + lib/x509/hostname-verify.c | 5 +++-- + 1 file changed, 3 insertions(+), 2 deletions(-) + +diff --git a/lib/x509/hostname-verify.c b/lib/x509/hostname-verify.c +index e7597ad3b0..d989bb1abc 100644 +--- a/lib/x509/hostname-verify.c ++++ b/lib/x509/hostname-verify.c +@@ -108,8 +108,9 @@ unsigned gnutls_x509_crt_check_ip(gnutls_x509_crt_t cert, + * that we do not fallback to CN-ID if we encounter a supported name + * type. + */ +-#define PRECLUDES_CN_FALLBACK(san) \ +- (san == GNUTLS_SAN_DNSNAME || san == GNUTLS_SAN_IPADDRESS) ++#define PRECLUDES_CN_FALLBACK(san) \ ++ (san == GNUTLS_SAN_DNSNAME || san == GNUTLS_SAN_IPADDRESS || \ ++ san == GNUTLS_SAN_URI || san == GNUTLS_SAN_OTHERNAME_SRV) + + /** + * gnutls_x509_crt_check_hostname2: +-- +GitLab + diff --git a/meta/recipes-support/gnutls/gnutls_3.8.12.bb b/meta/recipes-support/gnutls/gnutls_3.8.12.bb index 3ad011742e..8716c929e7 100644 --- a/meta/recipes-support/gnutls/gnutls_3.8.12.bb +++ b/meta/recipes-support/gnutls/gnutls_3.8.12.bb @@ -37,6 +37,9 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar file://CVE-2026-42009_p1.patch \ file://CVE-2026-42009_p2.patch \ file://CVE-2026-3833.patch \ + file://CVE-2026-42012-pre1.patch \ + file://CVE-2026-42012-pre2.patch \ + file://CVE-2026-42012.patch \ " SRC_URI[sha256sum] = "a7b341421bfd459acf7a374ca4af3b9e06608dcd7bd792b2bf470bea012b8e51" -- 2.34.1
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