[OE-core][wrynose][PATCH 1/3] qemu: Fix CVE-2026-2243

["Ashishkumar Parmar X (asparmar - E INFOCHIPS PRIVATE LIMITED at Cisco)" <asparmar@cisco.com>]

From: Ashishkumar Parmar <asparmar@cisco.com>

This patch applies the upstream stable-10.2 backport for CVE-2026-2243.
The upstream fix commit is referenced in [1], and the public CVE advisory
is referenced in [2].

[1] https://gitlab.com/qemu-project/qemu/-/commit/86b5130fefbe476f3c0a85b9e136f9e3fd518689
[2] https://github.com/advisories/GHSA-cw9w-w7fx-35q6

Signed-off-by: Ashishkumar Parmar <asparmar@cisco.com>
---
 meta/recipes-devtools/qemu/qemu.inc           |  1 +
 .../qemu/qemu/CVE-2026-2243.patch             | 45 +++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 meta/recipes-devtools/qemu/qemu/CVE-2026-2243.patch

diff --git a/meta/recipes-devtools/qemu/qemu.inc b/meta/recipes-devtools/qemu/qemu.inc
index 4b6c2252b7..1d493ee1a3 100644
--- a/meta/recipes-devtools/qemu/qemu.inc
+++ b/meta/recipes-devtools/qemu/qemu.inc
@@ -37,6 +37,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://qemu-guest-agent.init \
            file://qemu-guest-agent.udev \
            file://CVE-2024-6519.patch \
+           file://CVE-2026-2243.patch \
            "
 # file index at download.qemu.org isn't reliable: https://gitlab.com/qemu-project/qemu-web/-/issues/9
 UPSTREAM_CHECK_URI = "https://www.qemu.org"
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2026-2243.patch b/meta/recipes-devtools/qemu/qemu/CVE-2026-2243.patch
new file mode 100644
index 0000000000..bb2cb63b91
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2026-2243.patch
@@ -0,0 +1,45 @@
+From 1633b8cd69483ed6c481aa596d3c760c09257c27 Mon Sep 17 00:00:00 2001
+From: "Halil Oktay (oblivionsage)" <cookieandcream560@gmail.com>
+Date: Tue, 10 Feb 2026 13:33:25 +0100
+Subject: [PATCH] block/vmdk: fix OOB read in vmdk_read_extent()
+
+Bounds check for marker.size doesn't account for the 12-byte marker
+header, allowing zlib to read past the allocated buffer.
+
+Move the check inside the has_marker block and subtract the marker size.
+
+CVE: CVE-2026-2243
+Upstream-Status: Backport [https://gitlab.com/qemu-project/qemu/-/commit/86b5130fefbe476f3c0a85b9e136f9e3fd518689]
+
+Fixes: CVE-2026-2243
+Reported-by: Halil Oktay (oblivionsage) <cookieandcream560@gmail.com>
+Signed-off-by: Halil Oktay (oblivionsage) <cookieandcream560@gmail.com>
+Reviewed-by: Kevin Wolf <kwolf@redhat.com>
+Signed-off-by: Kevin Wolf <kwolf@redhat.com>
+(cherry picked from commit cfda94eddb6c9c49b66461c950b22845a46a75c9)
+Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
+(cherry picked from commit 86b5130fefbe476f3c0a85b9e136f9e3fd518689)
+Signed-off-by: Ashishkumar Parmar <asparmar@cisco.com>
+---
+ block/vmdk.c | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/block/vmdk.c b/block/vmdk.c
+index 89e89cd10..cd8b4ec7c 100644
+--- a/block/vmdk.c
++++ b/block/vmdk.c
+@@ -1951,10 +1951,10 @@ vmdk_read_extent(VmdkExtent *extent, int64_t cluster_offset,
+         marker = (VmdkGrainMarker *)cluster_buf;
+         compressed_data = marker->data;
+         data_len = le32_to_cpu(marker->size);
+-    }
+-    if (!data_len || data_len > buf_bytes) {
+-        ret = -EINVAL;
+-        goto out;
++        if (!data_len || data_len > buf_bytes - sizeof(VmdkGrainMarker)) {
++            ret = -EINVAL;
++            goto out;
++        }
+     }
+     ret = uncompress(uncomp_buf, &buf_len, compressed_data, data_len);
+     if (ret != Z_OK) {
-- 
2.35.6