CVE-2025-40241
erofs: fix crafted invalid cases for encoded extents
Reported by linux · Published December 4, 2025
In the Linux kernel, the following vulnerability has been resolved: erofs: fix crafted invalid cases for encoded extents Robert recently reported two corrupted images that can cause system crashes, which are related to the new encoded extents introduced in Linux 6.15: - The first one [1] has plen != 0 (e.g. plen == 0x2000000) but (plen & Z_EROFS_EXTENT_PLEN_MASK) == 0. It is used to represent special extents such as sparse extents (!EROFS_MAP_MAPPED), but previously only plen == 0 was handled; - The second one [2] has pa 0xffffffffffdcffed and plen 0xb4000, then "cur [0xfffffffffffff000] += bvec.bv_len [0x1000]" in "} while ((cur += bvec.bv_len) < end);" wraps around, causing an out-of-bound access of pcl->compressed_bvecs[] in z_erofs_submit_queue(). EROFS only supports 48-bit physical block addresses (up to 1EiB for 4k blocks), so add a sanity check to enforce this.
EPSS 0.14% · 3.7th percentile
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Linux | Linux | a429b76114aaca3ef1aff4cd469dcf025431bd11, 6.15, 00d8fe0b72f4ca0a983abced36aad2160038c421 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | 1d191b4ca51d73699cb127386b95ac152af2b930, 1d191b4ca51d73699cb127386b95ac152af2b930 |
| Linux | Linux | 6.15, 0, 6.17.6 |
| Linux | Linux | 6.15, 0, 1d191b4ca51d73699cb127386b95ac152af2b930 |
| linux | linux_kernel | 6.15, 6.15 |
Timeline
- Dec 4, 2025 CVE Published
- Dec 5, 2025 EPSS Score (30 in total, the first dated here)
- Mar 29, 2026 Distribution Patch (147 in total, the first dated here)
- Mar 29, 2026 Security Advisory (154 in total, the first dated here)
- Jun 8, 2026 Coalition ESS Score
- Jul 30, 2026 CVE Updated
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