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d="scan'208";a="825746587" Received: from alln-l-core-02.cisco.com ([173.36.16.139]) by alln-iport-4.cisco.com with ESMTP/TLS/TLS_AES_256_GCM_SHA384; 01 Sep 2026 08:54:08 +0000 Received: from sjc-ads-4178.cisco.com (sjc-ads-4178.cisco.com [171.70.54.199]) (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 alln-l-core-02.cisco.com (Postfix) with ESMTPS id 919701800020D; Tue, 1 Sep 2026 08:54:08 +0000 (GMT) Received: by sjc-ads-4178.cisco.com (Postfix, from userid 1887505) id 2EA04CE1C04; Tue, 1 Sep 2026 01:54:08 -0700 (PDT) From: "Hetvi Thakar -X (hthakar - E INFOCHIPS PRIVATE LIMITED at Cisco)" To: openembedded-devel@lists.openembedded.org Cc: xe-linux-external@cisco.com, Hetvi Thakar Subject: [OE-core][scarthgap][Patch v2 1/5] libssh: Fix CVE-2026-59843 Date: Tue, 1 Sep 2026 01:53:53 -0700 Message-Id: <20260901085357.1254306-2-hthakar@cisco.com> X-Mailer: git-send-email 2.35.6 In-Reply-To: <20260901085357.1254306-1-hthakar@cisco.com> References: <20260901085357.1254306-1-hthakar@cisco.com> MIME-Version: 1.0 X-Auto-Response-Suppress: DR, OOF, AutoReply X-Outbound-Client-TLS: VERIFIED;sjc-ads-4178.cisco.com [171.70.54.199];TLSv1.3;TLS_AES_256_GCM_SHA384;256;ciscoit-managed-infra-smtp-auth.cisco.com X-Outbound-SMTP-Client: 171.70.54.199, sjc-ads-4178.cisco.com X-Outbound-Node: alln-l-core-02.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 ; Tue, 01 Sep 2026 08:54:26 -0000 X-Groupsio-URL: https://lists.openembedded.org/g/openembedded-devel/message/129621 From: Hetvi Thakar The stable-0.11 commit shown in [1] is the upstream fix selected for this backport. The upstream advisory [2] documents CVE-2026-59843 and identifies libssh 0.11.5 as the fixed release for the 0.11 series. [1] https://git.libssh.org/projects/libssh.git/commit/?id=687ef1c44b646b9db0b1c6e8f987edb7c9e4d919 [2] https://www.libssh.org/security/advisories/CVE-2026-59843.txt Signed-off-by: Hetvi Thakar --- .../libssh/libssh/CVE-2026-59843.patch | 84 +++++++++++++++++++ .../recipes-support/libssh/libssh_0.10.6.bb | 1 + 2 files changed, 85 insertions(+) create mode 100644 meta-oe/recipes-support/libssh/libssh/CVE-2026-59843.patch diff --git a/meta-oe/recipes-support/libssh/libssh/CVE-2026-59843.patch b/meta-oe/recipes-support/libssh/libssh/CVE-2026-59843.patch new file mode 100644 index 000000000..03d3ce6ea --- /dev/null +++ b/meta-oe/recipes-support/libssh/libssh/CVE-2026-59843.patch @@ -0,0 +1,84 @@ +From d965eb941a9a83a0643570a93d8997b91e248fc1 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Pavol=20=C5=BD=C3=A1=C4=8Dik?= +Date: Fri, 6 Mar 2026 13:58:30 +0100 +Subject: [PATCH] CVE-2026-59843 channels: Fail when receiving max packet size + 0 +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Do this both for SSH2_MSG_CHANNEL_OPEN and for +SSH2_MSG_CHANNEL_OPEN_CONFIRMATION. Using the +max packet size 0 would lead to an infinite loop +in channel_write_common. + +Originally reported by Rinku Das on on 23th February. +Independently reported by Yi Lin on 26th February and +Haruto Kimura on 22nd March. + +We do not consider this as a security issue as connecting +to untrusted servers on the internet brings much worse +security consequences than hanging your clinet. + +Signed-off-by: Pavol Žáčik +Reviewed-by: Jakub Jelen + +CVE: CVE-2026-59843 +Upstream-Status: Backport [https://git.libssh.org/projects/libssh.git/commit/?id=687ef1c44b646b9db0b1c6e8f987edb7c9e4d919] + +(cherry picked from commit 44b186fa17aff497dae420c59c003222e438103c) +(cherry picked from commit 687ef1c44b646b9db0b1c6e8f987edb7c9e4d919) +Signed-off-by: Hetvi Thakar +--- + src/channels.c | 7 +++++++ + src/messages.c | 19 +++++++++++++++---- + 2 files changed, 22 insertions(+), 4 deletions(-) + +diff --git a/src/channels.c b/src/channels.c +index 8290dbd1..3afdcf11 100644 +--- a/src/channels.c ++++ b/src/channels.c +@@ -192,6 +192,13 @@ SSH_PACKET_CALLBACK(ssh_packet_channel_open_conf){ + if (rc != SSH_OK) + goto error; + ++ if (channel->remote_maxpacket == 0) { ++ SSH_LOG(SSH_LOG_RARE, ++ "Invalid maximum packet size 0 in " ++ "SSH2_MSG_CHANNEL_OPEN_CONFIRMATION"); ++ goto error; ++ } ++ + SSH_LOG(SSH_LOG_PROTOCOL, + "Received a CHANNEL_OPEN_CONFIRMATION for channel %d:%d", + channel->local_channel, +diff --git a/src/messages.c b/src/messages.c +index 6dadabf0..e79ecec2 100644 +--- a/src/messages.c ++++ b/src/messages.c +@@ -1160,10 +1160,21 @@ SSH_PACKET_CALLBACK(ssh_packet_channel_open){ + SSH_LOG(SSH_LOG_PACKET, + "Clients wants to open a %s channel", type_c); + +- ssh_buffer_unpack(packet,"ddd", +- &msg->channel_request_open.sender, +- &msg->channel_request_open.window, +- &msg->channel_request_open.packet_size); ++ rc = ssh_buffer_unpack(packet, ++ "ddd", ++ &msg->channel_request_open.sender, ++ &msg->channel_request_open.window, ++ &msg->channel_request_open.packet_size); ++ if (rc != SSH_OK){ ++ goto error; ++ } ++ ++ if (msg->channel_request_open.packet_size == 0) { ++ ssh_set_error(session, ++ SSH_FATAL, ++ "Invalid maximum packet size 0 in SSH2_MSG_CHANNEL_OPEN"); ++ goto error; ++ } + + if (session->session_state != SSH_SESSION_STATE_AUTHENTICATED){ + ssh_set_error(session,SSH_FATAL, "Invalid state when receiving channel open request (must be authenticated)"); diff --git a/meta-oe/recipes-support/libssh/libssh_0.10.6.bb b/meta-oe/recipes-support/libssh/libssh_0.10.6.bb index 1e1b5fb0a..10d063f6d 100644 --- a/meta-oe/recipes-support/libssh/libssh_0.10.6.bb +++ b/meta-oe/recipes-support/libssh/libssh_0.10.6.bb @@ -32,6 +32,7 @@ SRC_URI = "git://git.libssh.org/projects/libssh.git;protocol=https;branch=stable file://CVE-2026-0968-2.patch \ file://CVE-2026-0967.patch \ file://CVE-2026-0965.patch \ + file://CVE-2026-59843.patch \ " SRCREV = "10e09e273f69e149389b3e0e5d44b8c221c2e7f6"