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CVE-2025-39838— cifs: prevent NULL pointer dereference in UTF16 conversion

EPSS 0.02% · P5

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux41d3f256c6a5e41eb32b87168399c0facd512dc0< 1f797f062b5cf13a1c2bcc23285361baaa7c9260affected
41d3f256c6a5e41eb32b87168399c0facd512dc0< 3c26a8d30ed6b53a52a023ec537dc50a6d34a67aaffected
41d3f256c6a5e41eb32b87168399c0facd512dc0< 70bccd9855dae56942f2b18a08ba137bb54093a0affected
6.12affected
< 6.12unaffected
6.12.46≤ 6.12.*unaffected
6.16.6≤ 6.16.*unaffected
6.17≤ *unaffected
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I. Basic Information for CVE-2025-39838

Vulnerability Information
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Vulnerability Title
cifs: prevent NULL pointer dereference in UTF16 conversion
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: cifs: prevent NULL pointer dereference in UTF16 conversion There can be a NULL pointer dereference bug here. NULL is passed to __cifs_sfu_make_node without checks, which passes it unchecked to cifs_strndup_to_utf16, which in turn passes it to cifs_local_to_utf16_bytes where '*from' is dereferenced, causing a crash. This patch adds a check for NULL 'src' in cifs_strndup_to_utf16 and returns NULL early to prevent dereferencing NULL pointer. Found by Linux Verification Center (linuxtesting.org) with SVACE
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，该漏洞源于未检查NULL指针，可能导致空指针取消引用。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 41d3f256c6a5e41eb32b87168399c0facd512dc0 ~ 1f797f062b5cf13a1c2bcc23285361baaa7c9260 -
LinuxLinux 6.12 -

II. Public POCs for CVE-2025-39838

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III. Intelligence Information for CVE-2025-39838

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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total

CVE-2025-39851vxlan: Fix NPD when refreshing an FDB entry with a nexthop object
CVE-2025-39837platform/x86: asus-wmi: Fix racy registrations
CVE-2025-39839batman-adv: fix OOB read/write in network-coding decode
CVE-2025-39840audit: fix out-of-bounds read in audit_compare_dname_path()
CVE-2025-39841scsi: lpfc: Fix buffer free/clear order in deferred receive path
CVE-2025-39842ocfs2: prevent release journal inode after journal shutdown
CVE-2025-39844mm: move page table sync declarations to linux/pgtable.h
CVE-2025-39843mm: slub: avoid wake up kswapd in set_track_prepare
CVE-2025-39845x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()
CVE-2025-39846pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region()
CVE-2025-39847ppp: fix memory leak in pad_compress_skb
CVE-2025-39848ax25: properly unshare skbs in ax25_kiss_rcv()
CVE-2025-39849wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()
CVE-2025-39850vxlan: Fix NPD in {arp,neigh}_reduce() when using nexthop objects
CVE-2025-39852net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6
CVE-2025-39866fs: writeback: fix use-after-free in __mark_inode_dirty()
CVE-2025-39853i40e: Fix potential invalid access when MAC list is empty
CVE-2025-39854ice: fix NULL access of tx->in_use in ice_ll_ts_intr
CVE-2025-39856net: ethernet: ti: am65-cpsw-nuss: Fix null pointer dereference for ndev
CVE-2025-39855ice: fix NULL access of tx->in_use in ice_ptp_ts_irq

Showing top 20 of 30 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39838

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