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CVE-2026-64567— Linux kernel 安全漏洞

一分钟漏洞结论

影响对象
Linux Linux
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。

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.2版本存在安全漏洞，该漏洞源于加载v1空闲空间缓存时未验证num_entries字段，导致越界读取，可能造成内核崩溃。

CVSS 7.8 · High EPSS 0.12% · P2

影响版本矩阵 18

厂商产品 版本范围状态
Linux Linux 5b0e95bf607ddd59b39f52d3d55e6581c817b530< 8ded74c654a982dc8581a17b0caa7fcedb20de69 affected
5b0e95bf607ddd59b39f52d3d55e6581c817b530< c9c38066b6446e83668c041702bb639b0ca49363 affected
5b0e95bf607ddd59b39f52d3d55e6581c817b530< 094734c7aaa2b36751dc32480a680a4952685e78 affected
5b0e95bf607ddd59b39f52d3d55e6581c817b530< 33878ba25e2638bc0c61623d7a05c9ca2b74c039 affected
5b0e95bf607ddd59b39f52d3d55e6581c817b530< 404a0b986e0b6e79738fdf1f0ebbbc43b9acd2a2 affected
5b0e95bf607ddd59b39f52d3d55e6581c817b530< 5e1b2ca6b34939e70fb0785e8222b53cf060016f affected
5b0e95bf607ddd59b39f52d3d55e6581c817b530< f9fef131fa3f59b857217f522fa5ea430d1b707c affected
5b0e95bf607ddd59b39f52d3d55e6581c817b530< a2d8d5647ed854e38f941741aea45b9eb15a6350 affected
… +10 条更多
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一、 漏洞 CVE-2026-64567 基础信息

漏洞信息
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Vulnerability Title
btrfs: reject free space cache with more entries than pages
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: reject free space cache with more entries than pages When loading a v1 free space cache, __load_free_space_cache() takes num_entries and num_bitmaps straight from the on-disk btrfs_free_space_header. That header is stored in the tree_root under a key with type 0, which the tree-checker has no case for, so neither count is validated before the load trusts it. The load loops num_entries times and maps the next page whenever the current one runs out, going through io_ctl_check_crc() -> io_ctl_map_page(), which does io_ctl->pages[io_ctl->index++]. But pages[] is allocated in io_ctl_init() from the cache inode's i_size, not from num_entries: num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS); So if num_entries claims more records than the pages can hold, io_ctl->index runs off the end of pages[]. The write side never hits this because io_ctl_add_entry() and io_ctl_add_bitmap() both stop once io_ctl->index >= io_ctl->num_pages; the read side just never had the same check. To trigger it, take a clean cache (num_entries = <N> here), set num_entries in the header to 0x10000, and fix up the leaf checksum so it still passes the tree-checker. The cache inode has i_size = 65536, so num_pages is 16 and pages[] is a 16-pointer (kmalloc-128) array. The load now tries to read 65536 entries, io_ctl->index walks up to 16, and pages[16] is read past the array: BUG: KASAN: slab-out-of-bounds in io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) Read of size 8 at addr ffff88800c833a80 by task kworker/u8:3/58 io_ctl_check_crc (fs/btrfs/free-space-cache.c:420 fs/btrfs/free-space-cache.c:565) __load_free_space_cache (fs/btrfs/free-space-cache.c:655 fs/btrfs/free-space-cache.c:820) load_free_space_cache (fs/btrfs/free-space-cache.c:1017) caching_thread (fs/btrfs/block-group.c:880) btrfs_work_helper (fs/btrfs/async-thread.c:312) process_one_work worker_thread kthread ret_from_fork free-space-cache.c:420 is io_ctl_map_page(), inlined into io_ctl_check_crc() at line 565, which is why that is the frame KASAN names. The out-of-bounds slot is then treated as a struct page and handed to crc32c(), so the bad read turns into a GP fault. Add the missing check to io_ctl_check_crc(), which is where both the entry loop and the bitmap loop end up. When num_entries is too large the load now fails like any corrupt cache: __load_free_space_cache() drops it and rebuilds the free space from the extent tree, so a valid cache is never rejected.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.2版本存在安全漏洞，该漏洞源于加载v1空闲空间缓存时未验证num_entries字段，导致越界读取，可能造成内核崩溃。
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
Linux Linux 5b0e95bf607ddd59b39f52d3d55e6581c817b530 ~ 8ded74c654a982dc8581a17b0caa7fcedb20de69 -
Linux Linux 3.2 -

二、漏洞 CVE-2026-64567 的公开POC

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三、漏洞 CVE-2026-64567 的情报信息

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CVE-2026-64567 补丁与修复 (8)

同批安全公告 · Linux · 2026-08-05 · 共 17 条

CVE-2026-64566 9.8 CRITICAL Linux kernel 安全漏洞
CVE-2026-64578 8.2 HIGH Linux kernel 安全漏洞
CVE-2026-64568 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-64570 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-64574 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-64575 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-64580 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-64581 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-64582 7.8 HIGH Linux kernel 安全漏洞
CVE-2026-64577 7.5 HIGH Linux kernel 安全漏洞
CVE-2026-64576 7.1 HIGH Linux kernel 安全漏洞
CVE-2026-64569 Linux kernel 安全漏洞
CVE-2026-64571 Linux kernel 安全漏洞
CVE-2026-64572 Linux kernel 安全漏洞
CVE-2026-64573 Linux kernel 安全漏洞
CVE-2026-64579 Linux kernel 安全漏洞

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64567

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