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From d335821a1f814eb3059ab5e6a7cd771360b698c4 Mon Sep 17 0= 0:00:00 2001
From: Oblivionsage <cookieandcream560@gmail.com>
Date: Tue, 10 Feb 2026 13= :33:25 +0100
Subject: [PATCH] block/vmdk: fix OOB read in vmdk_read_exte= nt()
To: qemu-devel@nongnu.org<= /a>
Cc: qemu-block@nongnu.org,
=C2=A0 =C2=A0 qemu-stable@= nongnu.org,
=C2=A0 =C2=A0 kwolf@= redhat.com,
=C2=A0 =C2=A0 hreit= z@redhat.com,
=C2=A0 =C2=A0 fam@eu= phon.net

Bounds check for marker.size doesn't account for th= e 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.

Fixes: CVE-2026-2243
Reported-by: Halil Oktay (oblivionsag= e) <cookieandcream560@gma= il.com>
Signed-off-by: Halil Oktay (oblivionsage) <cookieandcream560@gmail.com>
= ---
=C2=A0block/vmdk.c | 8 ++++----
=C2=A01 file changed, 4 insertion= s(+), 4 deletions(-)

diff --git a/block/vmdk.c b/block/vmdk.c
ind= ex 89e89cd10e..cd8b4ec7c8 100644
--- a/block/vmdk.c
+++ b/block/vmdk.= c
@@ -1951,10 +1951,10 @@ vmdk_read_extent(VmdkExtent *extent, int64_t c= luster_offset,
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0marker =3D (VmdkGrainMa= rker *)cluster_buf;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0compressed_data = =3D marker->data;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0data_len =3D le32= _to_cpu(marker->size);
- =C2=A0 =C2=A0}
- =C2=A0 =C2=A0if (!data_l= en || data_len > buf_bytes) {
- =C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D -E= INVAL;
- =C2=A0 =C2=A0 =C2=A0 =C2=A0goto out;
+ =C2=A0 =C2=A0 =C2=A0 = =C2=A0if (!data_len || data_len > buf_bytes - sizeof(VmdkGrainMarker)) {=
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0ret =3D -EINVAL;
+ =C2=A0= =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0goto out;
+ =C2=A0 =C2=A0 =C2=A0 =C2= =A0}
=C2=A0 =C2=A0 =C2=A0}
=C2=A0 =C2=A0 =C2=A0ret =3D uncompress(unc= omp_buf, &buf_len, compressed_data, data_len);
=C2=A0 =C2=A0 =C2=A0i= f (ret !=3D Z_OK) {
--
2.47.3
--000000000000fdfa0e064a77a5dd--