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 <[email protected]> --- .../gnutls/gnutls/CVE-2026-5260_p1.patch | 69 +++++++++++++++++++ .../gnutls/gnutls/CVE-2026-5260_p2.patch | 33 +++++++++ meta/recipes-support/gnutls/gnutls_3.8.12.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 diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p1.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p1.patch new file mode 100644 index 0000000000..c5ab814031 --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p1.patch @@ -0,0 +1,69 @@ +From 77228f2d1ac207d2f894e5a168fbb47e5378e42f Mon Sep 17 00:00:00 2001 +From: Alexander Sosedkin <[email protected]> +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 <[email protected]> +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 <[email protected]> + +CVE: CVE-2026-5260 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/77228f2d1ac207d2f894e5a168fbb47e5378e42f] + +Signed-off-by: Jakub Szczudlo <[email protected]> +--- +diff --git a/lib/auth/rsa.c b/lib/auth/rsa.c +index 4d18132..496c378 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 cc92b4a..dba4011 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); diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p2.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p2.patch new file mode 100644 index 0000000000..67154164c5 --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-5260_p2.patch @@ -0,0 +1,33 @@ +From cf6bdc5e4df49e5583d3fb4d2296779785f10683 Mon Sep 17 00:00:00 2001 +From: Alexander Sosedkin <[email protected]> +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 <[email protected]> +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 <[email protected]> + +CVE: CVE-2026-5260 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/cf6bdc5e4df49e5583d3fb4d2296779785f10683] + +Signed-off-by: Jakub Szczudlo <[email protected]> +--- +diff --git a/lib/pkcs11_privkey.c b/lib/pkcs11_privkey.c +index 568474e..e133c49 100644 +--- a/lib/pkcs11_privkey.c ++++ b/lib/pkcs11_privkey.c +@@ -838,7 +838,7 @@ 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; diff --git a/meta/recipes-support/gnutls/gnutls_3.8.12.bb b/meta/recipes-support/gnutls/gnutls_3.8.12.bb index 58acf4f1f5..203ecbc375 100644 --- a/meta/recipes-support/gnutls/gnutls_3.8.12.bb +++ b/meta/recipes-support/gnutls/gnutls_3.8.12.bb @@ -44,6 +44,8 @@ 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] = "a7b341421bfd459acf7a374ca4af3b9e06608dcd7bd792b2bf470bea012b8e51" -- 2.34.1
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