CVE-2025-40241

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> erofs: fix crafted invalid cases for encoded extents<br /> <br /> Robert recently reported two corrupted images that can cause system<br /> crashes, which are related to the new encoded extents introduced<br /> in Linux 6.15:<br /> <br /> - The first one [1] has plen != 0 (e.g. plen == 0x2000000) but<br /> (plen &amp; Z_EROFS_EXTENT_PLEN_MASK) == 0. It is used to represent<br /> special extents such as sparse extents (!EROFS_MAP_MAPPED), but<br /> previously only plen == 0 was handled;<br /> <br /> - The second one [2] has pa 0xffffffffffdcffed and plen 0xb4000,<br /> then "cur [0xfffffffffffff000] += bvec.bv_len [0x1000]" in<br /> "} while ((cur += bvec.bv_len) compressed_bvecs[] in<br /> z_erofs_submit_queue(). EROFS only supports 48-bit physical block<br /> addresses (up to 1EiB for 4k blocks), so add a sanity check to<br /> enforce this.