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CVE-2025-38709— loop: Avoid updating block size under exclusive owner

EPSS 0.03% · P7
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I. Basic Information for CVE-2025-38709

Vulnerability Information
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Vulnerability Title
loop: Avoid updating block size under exclusive owner
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: loop: Avoid updating block size under exclusive owner Syzbot came up with a reproducer where a loop device block size is changed underneath a mounted filesystem. This causes a mismatch between the block device block size and the block size stored in the superblock causing confusion in various places such as fs/buffer.c. The particular issue triggered by syzbot was a warning in __getblk_slow() due to requested buffer size not matching block device block size. Fix the problem by getting exclusive hold of the loop device to change its block size. This fails if somebody (such as filesystem) has already an exclusive ownership of the block device and thus prevents modifying the loop device under some exclusive owner which doesn't expect it.
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loop设备未独占更新块大小。
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 89e4fdecb51cf5535867026274bc97de9480ade5 ~ 457d2c5e112fd08dc1039b1ae39a83ec1782360d -
LinuxLinux 4.14 -

II. Public POCs for CVE-2025-38709

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III. Intelligence Information for CVE-2025-38709

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Same Patch Batch · Linux · 2025-09-04 · 52 CVEs total

CVE-2025-38693media: dvb-frontends: w7090p: fix null-ptr-deref in w7090p_tuner_write_serpar and w7090p_t
CVE-2025-38679media: venus: Fix OOB read due to missing payload bound check
CVE-2025-38680media: uvcvideo: Fix 1-byte out-of-bounds read in uvc_parse_format()
CVE-2025-38685fbdev: Fix vmalloc out-of-bounds write in fast_imageblit
CVE-2025-38682i2c: core: Fix double-free of fwnode in i2c_unregister_device()
CVE-2025-38683hv_netvsc: Fix panic during namespace deletion with VF
CVE-2025-38684net/sched: ets: use old 'nbands' while purging unused classes
CVE-2025-38681mm/ptdump: take the memory hotplug lock inside ptdump_walk_pgd()
CVE-2025-38692exfat: add cluster chain loop check for dir
CVE-2025-38694media: dvb-frontends: dib7090p: fix null-ptr-deref in dib7090p_rw_on_apb()
CVE-2025-38690drm/xe/migrate: prevent infinite recursion
CVE-2025-38695scsi: lpfc: Check for hdwq null ptr when cleaning up lpfc_vport structure
CVE-2025-38696MIPS: Don't crash in stack_top() for tasks without ABI or vDSO
CVE-2025-38697jfs: upper bound check of tree index in dbAllocAG
CVE-2025-38699scsi: bfa: Double-free fix
CVE-2025-38698jfs: Regular file corruption check
CVE-2025-38700scsi: libiscsi: Initialize iscsi_conn->dd_data only if memory is allocated
CVE-2025-38701ext4: do not BUG when INLINE_DATA_FL lacks system.data xattr
CVE-2025-38702fbdev: fix potential buffer overflow in do_register_framebuffer()
CVE-2025-38703drm/xe: Make dma-fences compliant with the safe access rules

Showing top 20 of 52 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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