CVE-2026-13478— zephyrproject Zephyr 缓冲区错误漏洞
一分钟漏洞结论
影响对象
zephyrproject zephyr
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
zephyrproject Zephyr是zephyrproject组织开源的一款面向物联网设备的实时操作系统。 zephyrproject Zephyr 3.5.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于ext2文件系统驱动程序在验证磁盘块位图时未对超级块中的块计数进行边界检查，导致越界读取，可能造成系统崩溃，导致拒绝服务。
影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 3.5.0< 4.4.2 |
affected |
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一、 漏洞 CVE-2026-13478 基础信息
漏洞信息
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Vulnerability Title
Out-of-bounds read in Zephyr ext2 block-bitmap validation from a crafted s_blocks_count
来源: CVE Program / CVE List V5
Vulnerability Description
The Zephyr ext2 filesystem driver validates the on-disk block bitmap in ext2_init_fs() (subsys/fs/ext2/ext2_impl.c) by passing fs_blocks = s_blocks_count - s_first_data_block to ext2_bitmap_count_set(). That helper (subsys/fs/ext2/ext2_bitmap.c) treats its argument as a number of bits and reads one bitmap byte per eight bits, but the bitmap buffer (BGROUP_BLOCK_BITMAP) is a single fetched block of only fs->block_size bytes (capacity fs->block_size * 8 bits). s_blocks_count and s_first_data_block are taken verbatim from the superblock and were never bounded against this single-group capacity; ext2_verify_disk_superblock() checks the magic, revision, and block-size shift but not the block count.
A crafted ext2 image with an oversized s_blocks_count (up to ~4 billion, against a maximum 4096-byte block / 32768-bit bitmap) makes ext2_bitmap_count_set() scan roughly 512 MB of memory past the bitmap block — a large out-of-bounds read of the static block slab and adjacent memory.
The defect is reached during mount: ext2_init_fs() is invoked from ext2_mount() (subsys/fs/ext2/ext2_ops.c), the registered .mount operation. Any path that mounts an attacker-supplied ext2 image (removable media, a disk/flash partition, or a downloaded image) triggers it. The kernel-privileged parser operates on attacker-controlled data, so the bug is exploitable wherever untrusted ext2 media can be mounted.
Impact is an out-of-bounds read only: the resulting bit count is compared internally and the mount is rejected, so no attacker-controlled bytes are returned (not a useful information leak). The ~512 MB over-read will almost certainly cross an unmapped or MPU-protected boundary and fault, crashing the system — a denial of service triggered by mounting a single malformed image. The fix rejects any image whose fs_blocks exceeds fs->block_size * 8 before the scan.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
来源: CVE Program / CVE List V5
Vulnerability Title
zephyrproject Zephyr 缓冲区错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
zephyrproject Zephyr是zephyrproject组织开源的一款面向物联网设备的实时操作系统。 zephyrproject Zephyr 3.5.0版本至4.4.2之前版本存在缓冲区错误漏洞，该漏洞源于ext2文件系统驱动程序在验证磁盘块位图时未对超级块中的块计数进行边界检查，导致越界读取，可能造成系统崩溃，导致拒绝服务。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 3.5.0 ~ 4.4.2 | - |
|
二、漏洞 CVE-2026-13478 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-13478 补丁与修复 (1)
CVE-2026-13478 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-08-25 · 共 5 条
| CVE-2026-13214 | 9.8 CRITICAL | zephyrproject Zephyr 缓冲区错误漏洞 |
| CVE-2026-13215 | 6.8 MEDIUM | zephyrproject Zephyr 缓冲区错误漏洞 |
| CVE-2026-13216 | 6.1 MEDIUM | zephyrproject Zephyr 缓冲区错误漏洞 |
| CVE-2026-13217 | 5.9 MEDIUM | zephyrproject Zephyr 异常处理不当漏洞 |