From: Adarsh Jagadish Kamini <[email protected]> Backport patch to fix CVE-2026-33845.
References: https://nvd.nist.gov/vuln/detail/CVE-2026-33845 Upstream fix: https://gitlab.com/gnutls/gnutls/-/commit/e5b72c53c7d789d19d1d1cd10b275e87d0415413 Signed-off-by: Adarsh Jagadish Kamini <[email protected]> Signed-off-by: Yoann Congal <[email protected]> --- .../gnutls/gnutls/CVE-2026-33845.patch | 166 ++++++++++++++++++ meta/recipes-support/gnutls/gnutls_3.8.12.bb | 1 + 2 files changed, 167 insertions(+) create mode 100644 meta/recipes-support/gnutls/gnutls/CVE-2026-33845.patch diff --git a/meta/recipes-support/gnutls/gnutls/CVE-2026-33845.patch b/meta/recipes-support/gnutls/gnutls/CVE-2026-33845.patch new file mode 100644 index 00000000000..004d3082c5a --- /dev/null +++ b/meta/recipes-support/gnutls/gnutls/CVE-2026-33845.patch @@ -0,0 +1,166 @@ +From 490bfb28002fc0253010243ac387c756014c06e5 Mon Sep 17 00:00:00 2001 +From: Alexander Sosedkin <[email protected]> +Date: Mon, 23 Mar 2026 15:09:43 +0100 +Subject: [PATCH] buffers: switch from end_offset over to frag_length + +Instead of maintaining an inclusive [start_offset, end_offset] range +when reassembling DTLS handshake, +track start_offset and a relative frag_length instead. + +You'd think it'd be a no-op, but it fixes: + +* 0-length fragments triggering completion if message was 1 byte long +* a remotely triggerable underflow and an ensuing heap overrun + +Reported-by: Joshua Rogers of AISLE Research Team <[email protected]> +Fixes: #1811 +Fixes: CVE-2026-33845 +Fixes: GNUTLS-SA-2026-04-29-3 +CVSS: 7.5 High CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H +Signed-off-by: Alexander Sosedkin <[email protected]> + +CVE: CVE-2026-33845 +Upstream-Status: Backport [https://gitlab.com/gnutls/gnutls/-/commit/e5b72c53c7d789d19d1d1cd10b275e87d0415413] +Signed-off-by: Adarsh Jagadish Kamini <[email protected]> +--- + lib/buffers.c | 50 +++++++++++++++++++++++++----------------------- + lib/gnutls_int.h | 4 ++-- + 2 files changed, 28 insertions(+), 26 deletions(-) + +diff --git a/lib/buffers.c b/lib/buffers.c +index 09779a8f3..02cc222c4 100644 +--- a/lib/buffers.c ++++ b/lib/buffers.c +@@ -919,10 +919,7 @@ static int parse_handshake_header(gnutls_session_t session, mbuffer_st *bufel, + } + data_size = _mbuffer_get_udata_size(bufel) - handshake_header_size; + +- if (frag_size > 0) +- hsk->end_offset = hsk->start_offset + frag_size - 1; +- else +- hsk->end_offset = 0; ++ hsk->frag_length = frag_size; + + _gnutls_handshake_log( + "HSK[%p]: %s (%u) was received. Length %d[%d], frag offset %d, frag length: %d, sequence: %d\n", +@@ -936,9 +933,10 @@ static int parse_handshake_header(gnutls_session_t session, mbuffer_st *bufel, + + if (hsk->length > 0 && + (frag_size > data_size || +- (frag_size > 0 && hsk->end_offset >= hsk->length))) { ++ (frag_size > 0 && hsk->start_offset + frag_size > hsk->length))) { + return gnutls_assert_val(GNUTLS_E_UNEXPECTED_PACKET_LENGTH); +- } else if (hsk->length == 0 && hsk->end_offset != 0 && ++ } else if (hsk->length == 0 && ++ hsk->start_offset + frag_size != hsk->start_offset && + hsk->start_offset != 0) + return gnutls_assert_val(GNUTLS_E_UNEXPECTED_PACKET_LENGTH); + +@@ -1002,11 +1000,10 @@ static int merge_handshake_packet(gnutls_session_t session, + hsk->data.length = hsk->length; + } + +- if (hsk->length > 0 && hsk->end_offset > 0 && +- hsk->end_offset - hsk->start_offset + 1 != hsk->length) { ++ if (hsk->length > 0 && hsk->frag_length > 0 && ++ hsk->frag_length != hsk->length) { + memmove(&hsk->data.data[hsk->start_offset], +- hsk->data.data, +- hsk->end_offset - hsk->start_offset + 1); ++ hsk->data.data, hsk->frag_length); + } + + session->internals.handshake_recv_buffer_size++; +@@ -1040,20 +1037,27 @@ static int merge_handshake_packet(gnutls_session_t session, + } + + if (hsk->start_offset < recv_buf[pos].start_offset && +- hsk->end_offset + 1 >= recv_buf[pos].start_offset) { ++ hsk->start_offset + hsk->frag_length >= ++ recv_buf[pos].start_offset) { + memcpy(&recv_buf[pos].data.data[hsk->start_offset], + hsk->data.data, hsk->data.length); + recv_buf[pos].start_offset = hsk->start_offset; +- recv_buf[pos].end_offset = +- MIN(hsk->end_offset, recv_buf[pos].end_offset); +- } else if (hsk->end_offset > recv_buf[pos].end_offset && +- hsk->start_offset <= recv_buf[pos].end_offset + 1) { ++ recv_buf[pos].frag_length = MIN( ++ hsk->frag_length, recv_buf[pos].frag_length); ++ } else if (hsk->start_offset + hsk->frag_length > ++ recv_buf[pos].start_offset + ++ recv_buf[pos].frag_length && ++ hsk->start_offset <= ++ recv_buf[pos].start_offset + ++ recv_buf[pos].frag_length) { + memcpy(&recv_buf[pos].data.data[hsk->start_offset], + hsk->data.data, hsk->data.length); + +- recv_buf[pos].end_offset = hsk->end_offset; + recv_buf[pos].start_offset = MIN( + hsk->start_offset, recv_buf[pos].start_offset); ++ recv_buf[pos].frag_length = hsk->start_offset + ++ hsk->frag_length - ++ recv_buf[pos].start_offset; + } + _gnutls_handshake_buffer_clear(hsk); + } +@@ -1113,8 +1117,8 @@ static int get_last_packet(gnutls_session_t session, + } + + else if ((recv_buf[LAST_ELEMENT].start_offset == 0 && +- recv_buf[LAST_ELEMENT].end_offset == +- recv_buf[LAST_ELEMENT].length - 1) || ++ recv_buf[LAST_ELEMENT].frag_length == ++ recv_buf[LAST_ELEMENT].length) || + recv_buf[LAST_ELEMENT].length == 0) { + session->internals.dtls.hsk_read_seq++; + _gnutls_handshake_buffer_move(hsk, +@@ -1125,8 +1129,9 @@ static int get_last_packet(gnutls_session_t session, + /* if we don't have a complete handshake message, but we + * have queued data waiting, try again to reconstruct the + * handshake packet, using the queued */ +- if (recv_buf[LAST_ELEMENT].end_offset != +- recv_buf[LAST_ELEMENT].length - 1 && ++ if ((recv_buf[LAST_ELEMENT].start_offset + ++ recv_buf[LAST_ELEMENT].frag_length) != ++ recv_buf[LAST_ELEMENT].length && + record_check_unprocessed(session) > 0) + return gnutls_assert_val( + GNUTLS_E_INT_CHECK_AGAIN); +@@ -1313,9 +1318,7 @@ int _gnutls_parse_record_buffered_msgs(gnutls_session_t session) + &session->internals.record_buffer, + bufel, ret); + +- data_size = MIN(tmp.length, +- tmp.end_offset - +- tmp.start_offset + 1); ++ data_size = MIN(tmp.length, tmp.frag_length); + + ret = _gnutls_buffer_append_data( + &tmp.data, +@@ -1331,7 +1334,6 @@ int _gnutls_parse_record_buffered_msgs(gnutls_session_t session) + ret = merge_handshake_packet(session, &tmp); + if (ret < 0) + return gnutls_assert_val(ret); +- + } while (_mbuffer_get_udata_size(bufel) > 0); + + prev = bufel; +diff --git a/lib/gnutls_int.h b/lib/gnutls_int.h +index 54d3c9f67..283f25c07 100644 +--- a/lib/gnutls_int.h ++++ b/lib/gnutls_int.h +@@ -479,10 +479,10 @@ typedef struct { + uint16_t sequence; + + /* indicate whether that message is complete. +- * complete means start_offset == 0 and end_offset == length ++ * complete means start_offset == 0 and frag_length == length + */ + uint32_t start_offset; +- uint32_t end_offset; ++ uint32_t frag_length; /* used exclusively in DTLS reassembly */ + + uint8_t header[MAX_HANDSHAKE_HEADER_SIZE]; + int header_size; diff --git a/meta/recipes-support/gnutls/gnutls_3.8.12.bb b/meta/recipes-support/gnutls/gnutls_3.8.12.bb index 51ef394dfcf..d513752072c 100644 --- a/meta/recipes-support/gnutls/gnutls_3.8.12.bb +++ b/meta/recipes-support/gnutls/gnutls_3.8.12.bb @@ -40,6 +40,7 @@ SRC_URI = "https://www.gnupg.org/ftp/gcrypt/gnutls/v${SHRT_VER}/gnutls-${PV}.tar file://CVE-2026-42011_p1.patch \ file://CVE-2026-42011_p2.patch \ file://CVE-2026-42010.patch \ + file://CVE-2026-33845.patch \ " SRC_URI[sha256sum] = "a7b341421bfd459acf7a374ca4af3b9e06608dcd7bd792b2bf470bea012b8e51"
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