new file mode 100644
@@ -0,0 +1,69 @@
+From 77228f2d1ac207d2f894e5a168fbb47e5378e42f Mon Sep 17 00:00:00 2001
+From: Alexander Sosedkin <asosedkin@redhat.com>
+Date: Mon, 30 Mar 2026 17:31:07 +0200
+Subject: [PATCH] lib/auth/rsa: check that ciphertext matches the modulus size
+
+A client sending extremely short premaster secret as part of an
+RSA key exchange could've theoretically triggered a short heap overread
+to nowhere when the RSA key was backed with a PKCS#11 token.
+With this fix, the internal decryption function will not be called
+with an mismatching plaintext length specified, avoiding the overread.
+
+Reported-by: Joshua Rogers of AISLE Research Team <joshua@joshua.hu>
+Fixes: #1814
+Fixes: CVE-2026-5260
+Fixes: GNUTLS-SA-2026-04-29-10
+CVSS: 5.9 Medium CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
+Signed-off-by: Alexander Sosedkin <asosedkin@redhat.com>
+
+CVE: CVE-2026-5260
+Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/77228f2d1ac207d2f894e5a168fbb47e5378e42f]
+
+Signed-off-by: Jakub Szczudlo <jakub.szczudlo@nokia.com>
+---
+diff --git a/lib/auth/rsa.c b/lib/auth/rsa.c
+index b5ecc09..24c1649 100644
+--- a/lib/auth/rsa.c
++++ b/lib/auth/rsa.c
+@@ -158,6 +158,7 @@ static int proc_rsa_client_kx(gnutls_session_t session, uint8_t *data,
+ int ret, dsize;
+ ssize_t data_size = _data_size;
+ volatile uint8_t ver_maj, ver_min;
++ unsigned int key_bits;
+
+ #ifdef ENABLE_SSL3
+ if (get_num_version(session) == GNUTLS_SSL3) {
+@@ -180,6 +181,10 @@ static int proc_rsa_client_kx(gnutls_session_t session, uint8_t *data,
+ }
+ ciphertext.size = dsize;
+ }
++ gnutls_privkey_get_pk_algorithm(session->internals.selected_key,
++ &key_bits);
++ if (ciphertext.size != (key_bits + 7) / 8)
++ return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
+
+ ver_maj = _gnutls_get_adv_version_major(session);
+ ver_min = _gnutls_get_adv_version_minor(session);
+diff --git a/lib/auth/rsa_psk.c b/lib/auth/rsa_psk.c
+index 399fb4d..7a99d87 100644
+--- a/lib/auth/rsa_psk.c
++++ b/lib/auth/rsa_psk.c
+@@ -257,6 +257,7 @@ static int _gnutls_proc_rsa_psk_client_kx(gnutls_session_t session,
+ ssize_t data_size = _data_size;
+ gnutls_psk_server_credentials_t cred;
+ volatile uint8_t ver_maj, ver_min;
++ unsigned int rsa_key_bits;
+
+ cred = (gnutls_psk_server_credentials_t)_gnutls_get_cred(
+ session, GNUTLS_CRD_PSK);
+@@ -313,6 +314,10 @@ static int _gnutls_proc_rsa_psk_client_kx(gnutls_session_t session,
+ return GNUTLS_E_UNEXPECTED_PACKET_LENGTH;
+ }
+ ciphertext.size = dsize;
++ gnutls_privkey_get_pk_algorithm(session->internals.selected_key,
++ &rsa_key_bits);
++ if (ciphertext.size != (rsa_key_bits + 7) / 8)
++ return gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
+
+ ver_maj = _gnutls_get_adv_version_major(session);
+ ver_min = _gnutls_get_adv_version_minor(session);
new file mode 100644
@@ -0,0 +1,33 @@
+From cf6bdc5e4df49e5583d3fb4d2296779785f10683 Mon Sep 17 00:00:00 2001
+From: Alexander Sosedkin <asosedkin@redhat.com>
+Date: Mon, 30 Mar 2026 17:46:40 +0200
+Subject: [PATCH] lib/pkcs11_privkey: guard against overreading on short
+ ciphertexts
+
+This is an alternative fix for the callee side.
+
+Reported-by: Joshua Rogers of AISLE Research Team <joshua@joshua.hu>
+Fixes: #1814
+Fixes: CVE-2026-5260
+Fixes: GNUTLS-SA-2026-04-29-10
+CVSS: 5.9 Medium CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
+Signed-off-by: Alexander Sosedkin <asosedkin@redhat.com>
+
+CVE: CVE-2026-5260
+Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/cf6bdc5e4df49e5583d3fb4d2296779785f10683]
+
+Signed-off-by: Jakub Szczudlo <jakub.szczudlo@nokia.com>
+---
+diff --git a/lib/pkcs11_privkey.c b/lib/pkcs11_privkey.c
+index 5093a6d..369b034 100644
+--- a/lib/pkcs11_privkey.c
++++ b/lib/pkcs11_privkey.c
+@@ -826,7 +826,7 @@ int _gnutls_pkcs11_privkey_decrypt_data2(gnutls_pkcs11_privkey_t key,
+ if (ret != 0)
+ return gnutls_assert_val(GNUTLS_E_LOCKING_ERROR);
+
+- buffer = gnutls_malloc(siglen);
++ buffer = gnutls_malloc(MAX((size_t)siglen, plaintext_size));
+ if (!buffer) {
+ gnutls_assert();
+ return GNUTLS_E_MEMORY_ERROR;
@@ -54,6 +54,8 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar
file://CVE-2026-42013.patch \
file://CVE-2026-42014.patch \
file://CVE-2026-42015.patch \
+ file://CVE-2026-5260_p1.patch \
+ file://CVE-2026-5260_p2.patch \
"
SRC_URI[sha256sum] = "2bea4e154794f3f00180fa2a5c51fe8b005ac7a31cd58bd44cdfa7f36ebc3a9b"
Backport patch to fix CVE-2026-5260. References: https://nvd.nist.gov/vuln/detail/CVE-2026-5260 Upstream fix: https://gitlab.com/gnutls/gnutls/-/commit/77228f2d1ac207d2f894e5a168fbb47e5378e42f https://gitlab.com/gnutls/gnutls/-/commit/cf6bdc5e4df49e5583d3fb4d2296779785f10683 Tested with ptest Signed-off-by: Jakub Szczudlo <jakub.szczudlo@nokia.com> --- .../gnutls/gnutls/CVE-2026-5260_p1.patch | 69 +++++++++++++++++++ .../gnutls/gnutls/CVE-2026-5260_p2.patch | 33 +++++++++ meta/recipes-support/gnutls/gnutls_3.8.4.bb | 2 + 3 files changed, 104 insertions(+) create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p1.patch create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p2.patch