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d="scan'208";a="507877743" Received: from rcdn-l-core-01.cisco.com ([173.37.255.138]) by rcdn-iport-5.cisco.com with ESMTP/TLS/TLS_AES_256_GCM_SHA384; 10 Jul 2026 09:54:41 +0000 Received: from sjc-ads-12007.cisco.com (sjc-ads-12007.cisco.com [171.70.97.7]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "ciscoit-managed-infra-smtp-auth.cisco.com", Issuer "Internal Private TLS SubCA" (verified OK)) by rcdn-l-core-01.cisco.com (Postfix) with ESMTPS id D04E218000295 for ; Fri, 10 Jul 2026 09:54:40 +0000 (GMT) Received: by sjc-ads-12007.cisco.com (Postfix, from userid 1840713) id 6F4D7CAF087; Fri, 10 Jul 2026 02:54:40 -0700 (PDT) From: "Sudhir Dumbhare -X (sudumbha - E INFOCHIPS PRIVATE LIMITED at Cisco)" To: openembedded-core@lists.openembedded.org Subject: [OE-core][wrynose][PATCH 2/2] gnutls: Fix CVE-2026-42009 Date: Fri, 10 Jul 2026 02:54:22 -0700 Message-ID: <20260710095422.3042774-1-sudumbha@cisco.com> X-Mailer: git-send-email 2.51.0 MIME-Version: 1.0 X-Outbound-Client-TLS: VERIFIED;sjc-ads-12007.cisco.com [171.70.97.7];TLSv1.3;TLS_AES_256_GCM_SHA384;256;ciscoit-managed-infra-smtp-auth.cisco.com X-Outbound-SMTP-Client: 171.70.97.7, sjc-ads-12007.cisco.com X-Outbound-Node: rcdn-l-core-01.cisco.com List-Id: X-Webhook-Received: from 45-33-107-173.ip.linodeusercontent.com [45.33.107.173] by aws-us-west-2-korg-lkml-1.web.codeaurora.org with HTTPS for ; Fri, 10 Jul 2026 09:54:48 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-core/message/240626 From: Sudhir Dumbhare This patch applies the upstream fix [1] and [2], as referenced in [3], to address a DTLS packet reordering flaw where duplicate sequence numbers could lead to unstable ordering or undefined behavior. [1] https://gitlab.com/gnutls/gnutls/-/commit/f01e21441e29052a6f0963840794c41d3b3ee66d [2] https://gitlab.com/gnutls/gnutls/-/commit/f341441fad91142897d83b44a175ffc8f925b76f [3] https://security-tracker.debian.org/tracker/CVE-2026-42009 Reference: https://nvd.nist.gov/vuln/detail/CVE-2026-42009 Signed-off-by: Sudhir Dumbhare --- .../gnutls/gnutls/CVE-2026-42009_p1.patch | 67 +++++++++++++++++++ .../gnutls/gnutls/CVE-2026-42009_p2.patch | 48 +++++++++++++ meta/recipes-support/gnutls/gnutls_3.8.12.bb | 2 + 3 files changed, 117 insertions(+) create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p1.patch create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p2.patch diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p1.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p1.patch new file mode 100644 index 0000000000..066322cd75 --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p1.patch @@ -0,0 +1,67 @@ +From d1191b910e63149a10647a089995d3cd85e16400 Mon Sep 17 00:00:00 2001 +From: Alexander Sosedkin +Date: Tue, 21 Apr 2026 16:52:48 +0200 +Subject: [PATCH] lib/buffers: ensure packets have differing sequence + numbers + +There should normally be no packets with same sequence number and +differing handshake type, unless an adversary crafts them. +Discarding them allows to get rid of packets +with duplicate sequence ID in the buffer, +relieving us from the question of how to sort them later. + +Reported-by: Joshua Rogers of AISLE Research Team +Fixes: #1848 +Fixes: CVE-2026-42009 +Fixes: GNUTLS-SA-2026-04-29-2 +CVSS: 7.5 High CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H + +CVE: CVE-2026-42009 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/f01e21441e29052a6f0963840794c41d3b3ee66d] + +Backport Changes: +- Adjusted the upstream hunk to match the GnuTLS 3.8.12 code layout. +- The upstream commit uses the local recv_buf alias introduced later + in v3.8.13 by commit; + https://gitlab.com/gnutls/gnutls/-/commit/9deffca528c23bbb218f5ec3bd4bb1bf4cbd1fc0. +- GnuTLS 3.8.12 does not have that local recv_buf alias in + merge_handshake_packet(), so the backport replaces recv_buf[i] with the + existing session->internals.handshake_recv_buffer[i] access pattern. + +Signed-off-by: Alexander Sosedkin +(cherry picked from commit f01e21441e29052a6f0963840794c41d3b3ee66d) +Signed-off-by: Sudhir Dumbhare +--- + lib/buffers.c | 16 ++++++++++++++-- + 1 file changed, 14 insertions(+), 2 deletions(-) + +diff --git a/lib/buffers.c b/lib/buffers.c +index 672380b054..e7f08b5625 100644 +--- a/lib/buffers.c ++++ b/lib/buffers.c +@@ -968,8 +968,20 @@ static int merge_handshake_packet(gnutls_session_t session, + int ret; + + for (i = 0; i < session->internals.handshake_recv_buffer_size; i++) { +- if (session->internals.handshake_recv_buffer[i].htype == +- hsk->htype) { ++ if (session->internals.handshake_recv_buffer[i].sequence == hsk->sequence) { ++ if (session->internals.handshake_recv_buffer[i].htype != hsk->htype) { ++ _gnutls_audit_log( ++ session, ++ "Discarded unexpected handshake packet " ++ "with duplicate sequence %d, but " ++ "mismatched type %s (previously %s)\n", ++ hsk->sequence, ++ _gnutls_handshake2str(hsk->htype), ++ _gnutls_handshake2str( ++ session->internals.handshake_recv_buffer[i].htype)); ++ _gnutls_handshake_buffer_clear(hsk); ++ return 0; ++ } + exists = 1; + pos = i; + break; +-- +2.51.0 + diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p2.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p2.patch new file mode 100644 index 0000000000..6524cb47b4 --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-42009_p2.patch @@ -0,0 +1,48 @@ +From 5374a6d584b8598511f7880b4e64ee52ee1f0cc5 Mon Sep 17 00:00:00 2001 +From: Joshua Rogers +Date: Tue, 21 Apr 2026 18:11:39 +0200 +Subject: [PATCH] buffers: fix handshake_compare when sequence numbers + match + +The comparator function used for ordering DTLS packets +by sequence numbers did not follow qsort comparator contracts +in case of packets with duplicate sequence numbers, +which could lead to unstable ordering or undefined behaviour. +Returning 0 in such cases makes the sorting stable. + +Reported-by: Joshua Rogers of AISLE Research Team +Fixes: #1848 +Fixes: CVE-2026-42009 +Fixes: GNUTLS-SA-2026-04-29-2 +CVSS: 7.5 High CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H + +CVE: CVE-2026-42009 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/f341441fad91142897d83b44a175ffc8f925b76f] + +Signed-off-by: Joshua Rogers +(cherry picked from commit f341441fad91142897d83b44a175ffc8f925b76f) +Signed-off-by: Sudhir Dumbhare +--- + lib/buffers.c | 6 +----- + 1 file changed, 1 insertion(+), 5 deletions(-) + +diff --git a/lib/buffers.c b/lib/buffers.c +index e7f08b5625..1ac27e4e96 100644 +--- a/lib/buffers.c ++++ b/lib/buffers.c +@@ -844,11 +844,7 @@ static int handshake_compare(const void *_e1, const void *_e2) + { + const handshake_buffer_st *e1 = _e1; + const handshake_buffer_st *e2 = _e2; +- +- if (e1->sequence <= e2->sequence) +- return 1; +- else +- return -1; ++ return (e1->sequence < e2->sequence) - (e1->sequence > e2->sequence); + } + + #define SSL2_HEADERS 1 +-- +2.51.0 + diff --git a/meta/recipes-support/gnutls/gnutls_3.8.12.bb b/meta/recipes-support/gnutls/gnutls_3.8.12.bb index c6cbc9f46c..e6afb4870e 100644 --- a/meta/recipes-support/gnutls/gnutls_3.8.12.bb +++ b/meta/recipes-support/gnutls/gnutls_3.8.12.bb @@ -26,6 +26,8 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar file://c99.patch \ file://CVE-2026-3832_p1.patch \ file://CVE-2026-3832_p2.patch \ + file://CVE-2026-42009_p1.patch \ + file://CVE-2026-42009_p2.patch \ " SRC_URI[sha256sum] = "a7b341421bfd459acf7a374ca4af3b9e06608dcd7bd792b2bf470bea012b8e51"