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CVE-2025-21643— netfs: Fix kernel async DIO

EPSS 0.02% · P5
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I. Basic Information for CVE-2025-21643

Vulnerability Information
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Vulnerability Title
netfs: Fix kernel async DIO
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfs: Fix kernel async DIO Netfslib needs to be able to handle kernel-initiated asynchronous DIO that is supplied with a bio_vec[] array. Currently, because of the async flag, this gets passed to netfs_extract_user_iter() which throws a warning and fails because it only handles IOVEC and UBUF iterators. This can be triggered through a combination of cifs and a loopback blockdev with something like: mount //my/cifs/share /foo dd if=/dev/zero of=/foo/m0 bs=4K count=1K losetup --sector-size 4096 --direct-io=on /dev/loop2046 /foo/m0 echo hello >/dev/loop2046 This causes the following to appear in syslog: WARNING: CPU: 2 PID: 109 at fs/netfs/iterator.c:50 netfs_extract_user_iter+0x170/0x250 [netfs] and the write to fail. Fix this by removing the check in netfs_unbuffered_write_iter_locked() that causes async kernel DIO writes to be handled as userspace writes. Note that this change relies on the kernel caller maintaining the existence of the bio_vec array (or kvec[] or folio_queue) until the op is complete.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于netfs_unbuffered_write_iter_locked函数错误地将内核异步DIO写入处理为用户空间写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 153a9961b551101cd38e94e26cd92fbfd198b19b ~ 9f3a265836844eda30bf34c2584b8011fd4f0f49 -
LinuxLinux 6.8 -

II. Public POCs for CVE-2025-21643

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III. Intelligence Information for CVE-2025-21643

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Same Patch Batch · Linux · 2025-01-19 · 47 CVEs total

CVE-2024-57916misc: microchip: pci1xxxx: Resolve kernel panic during GPIO IRQ handling
CVE-2024-57918drm/amd/display: fix page fault due to max surface definition mismatch
CVE-2024-57921drm/amdgpu: Add a lock when accessing the buddy trim function
CVE-2024-57925ksmbd: fix a missing return value check bug
CVE-2024-57926drm/mediatek: Set private->all_drm_private[i]->drm to NULL if mtk_drm_bind returns err
CVE-2024-57928netfs: Fix enomem handling in buffered reads
CVE-2024-57927nfs: Fix oops in nfs_netfs_init_request() when copying to cache
CVE-2024-57929dm array: fix releasing a faulty array block twice in dm_array_cursor_end
CVE-2024-57923btrfs: zlib: fix avail_in bytes for s390 zlib HW compression path
CVE-2024-57917topology: Keep the cpumask unchanged when printing cpumap
CVE-2024-57919drm/amd/display: fix divide error in DM plane scale calcs
CVE-2024-57914usb: typec: tcpci: fix NULL pointer issue on shared irq case
CVE-2024-57913usb: gadget: f_fs: Remove WARN_ON in functionfs_bind
CVE-2024-57912iio: pressure: zpa2326: fix information leak in triggered buffer
CVE-2024-57911iio: dummy: iio_simply_dummy_buffer: fix information leak in triggered buffer
CVE-2024-57910iio: light: vcnl4035: fix information leak in triggered buffer
CVE-2024-57908iio: imu: kmx61: fix information leak in triggered buffer
CVE-2024-57909iio: light: bh1745: fix information leak in triggered buffer
CVE-2024-57907iio: adc: rockchip_saradc: fix information leak in triggered buffer
CVE-2024-57905iio: adc: ti-ads1119: fix information leak in triggered buffer

Showing top 20 of 47 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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