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CVE-2025-38691— pNFS: Fix uninited ptr deref in block/scsi layout

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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pNFS布局更新时未初始化指针导致空指针解引用。

AI Predicted 4.3 Difficulty: Hard EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 34dc93c2fc04da0d01acf8a1660b4ab276208af7< 579b85f893d9885162e1cabf99a4a088916e143e affected
34dc93c2fc04da0d01acf8a1660b4ab276208af7< 2896f101110076ac6bf99d7aaf463d61e26f89dd affected
34dc93c2fc04da0d01acf8a1660b4ab276208af7< 4f783333cbfa2ee7d4aa8e47f6bd1b3f77534fcf affected
34dc93c2fc04da0d01acf8a1660b4ab276208af7< 9be5c04beca3202d0a5f09fb4b2ecb644caa0bc5 affected
34dc93c2fc04da0d01acf8a1660b4ab276208af7< 24334f3cf8a294f253071b5bf22d754dbb6d0f2d affected
34dc93c2fc04da0d01acf8a1660b4ab276208af7< f0b2eee3fbba9b7e3746ef698424ef5e4a197776 affected
34dc93c2fc04da0d01acf8a1660b4ab276208af7< 94ec6d939031a616474376dadbf4a8d0ef8b0bcc affected
34dc93c2fc04da0d01acf8a1660b4ab276208af7< 37c3443a2685528f972d910a6fb87716b96fef46 affected
… +12 more rows
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I. Basic Information for CVE-2025-38691

Vulnerability Information
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Vulnerability Title
pNFS: Fix uninited ptr deref in block/scsi layout
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: pNFS: Fix uninited ptr deref in block/scsi layout The error occurs on the third attempt to encode extents. When function ext_tree_prepare_commit() reallocates a larger buffer to retry encoding extents, the "layoutupdate_pages" page array is initialized only after the retry loop. But ext_tree_free_commitdata() is called on every iteration and tries to put pages in the array, thus dereferencing uninitialized pointers. An additional problem is that there is no limit on the maximum possible buffer_size. When there are too many extents, the client may create a layoutcommit that is larger than the maximum possible RPC size accepted by the server. During testing, we observed two typical scenarios. First, one memory page for extents is enough when we work with small files, append data to the end of the file, or preallocate extents before writing. But when we fill a new large file without preallocating, the number of extents can be huge, and counting the number of written extents in ext_tree_encode_commit() does not help much. Since this number increases even more between unlocking and locking of ext_tree, the reallocated buffer may not be large enough again and again.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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pNFS布局更新时未初始化指针导致空指针解引用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 34dc93c2fc04da0d01acf8a1660b4ab276208af7 ~ 579b85f893d9885162e1cabf99a4a088916e143e -
Linux Linux 3.18 -

II. Public POCs for CVE-2025-38691

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III. Intelligence Information for CVE-2025-38691

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Patches & Fixes for CVE-2025-38691 (1)

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

CVE-2025-38708 9.8 CRITICAL drbd: add missing kref_get in handle_write_conflicts
CVE-2025-38724 9.8 CRITICAL nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()
CVE-2025-38728 9.1 CRITICAL smb3: fix for slab out of bounds on mount to ksmbd
CVE-2025-38688 8.8 HIGH iommufd: Prevent ALIGN() overflow
CVE-2025-38697 7.8 HIGH jfs: upper bound check of tree index in dbAllocAG
CVE-2025-38722 7.8 HIGH habanalabs: fix UAF in export_dmabuf()
CVE-2025-38685 7.8 HIGH fbdev: Fix vmalloc out-of-bounds write in fast_imageblit
CVE-2025-38718 7.8 HIGH sctp: linearize cloned gso packets in sctp_rcv
CVE-2025-38717 7.8 HIGH net: kcm: Fix race condition in kcm_unattach()
CVE-2025-38715 7.8 HIGH hfs: fix slab-out-of-bounds in hfs_bnode_read()
CVE-2025-38710 7.8 HIGH gfs2: Validate i_depth for exhash directories
CVE-2025-38730 7.8 HIGH io_uring/net: commit partial buffers on retry
CVE-2025-38703 7.8 HIGH drm/xe: Make dma-fences compliant with the safe access rules
CVE-2025-38714 7.8 HIGH hfsplus: fix slab-out-of-bounds in hfsplus_bnode_read()
CVE-2025-38679 7.3 HIGH media: venus: Fix OOB read due to missing payload bound check
CVE-2025-38687 7.3 HIGH comedi: fix race between polling and detaching
CVE-2025-38713 7.1 HIGH hfsplus: fix slab-out-of-bounds read in hfsplus_uni2asc()
CVE-2025-38707 7.1 HIGH fs/ntfs3: Add sanity check for file name
CVE-2025-38680 media: uvcvideo: Fix 1-byte out-of-bounds read in uvc_parse_format()
CVE-2025-38695 scsi: lpfc: Check for hdwq null ptr when cleaning up lpfc_vport structure

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38691

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