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CVE-2025-38562— ksmbd: fix null pointer dereference error in generate_encryptionkey

Quick assessment

Affected
Linux Linux
Exploitation
High exploitation probability; assess promptly
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generate_encryptionkey函数中存在空指针取消引用。

AI Predicted 5.5 Difficulty: Easy EPSS 11.88% · P96

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf< 922f85e6e88fdea723a26854c3a6dcb4beb8d0b9 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 96a82e19434a2522525baab59c33332658bc7653 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< d79c8bebaa622ee223128be7c66d8aaeeb634a57 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 2a30ed6428ce83afedca1a6c5c5c4247bcf12d0e affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 015ef163d65496ae3ba6192c96140a22743f0353 affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 9c2dbbc959e1fcc6f603a1a843e9cf743ba383bb affected
0626e6641f6b467447c81dd7678a69c66f7746cf< 9b493ab6f35178afd8d619800df9071992f715de affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2025-38562

Vulnerability Information
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Vulnerability Title
ksmbd: fix null pointer dereference error in generate_encryptionkey
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference error in generate_encryptionkey If client send two session setups with krb5 authenticate to ksmbd, null pointer dereference error in generate_encryptionkey could happen. sess->Preauth_HashValue is set to NULL if session is valid. So this patch skip generate encryption key if session is valid.
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generate_encryptionkey函数中存在空指针取消引用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf ~ 922f85e6e88fdea723a26854c3a6dcb4beb8d0b9 -
Linux Linux 5.15 -

II. Public POCs for CVE-2025-38562

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III. Intelligence Information for CVE-2025-38562

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Same Patch Batch · Linux · 2025-08-19 · 59 CVEs total

CVE-2025-38561 9.8 CRITICAL ksmbd: fix Preauh_HashValue race condition
CVE-2025-38566 9.8 CRITICAL sunrpc: fix handling of server side tls alerts
CVE-2025-38560 9.3 CRITICAL x86/sev: Evict cache lines during SNP memory validation
CVE-2025-38601 8.8 HIGH wifi: ath11k: clear initialized flag for deinit-ed srng lists
CVE-2025-38600 8.8 HIGH wifi: mt76: mt7925: fix off by one in mt7925_mcu_hw_scan()
CVE-2025-38599 8.8 HIGH wifi: mt76: mt7996: Fix possible OOB access in mt7996_tx()
CVE-2025-38592 8.8 HIGH Bluetooth: hci_devcd_dump: fix out-of-bounds via dev_coredumpv
CVE-2025-38608 8.6 HIGH bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls
CVE-2025-38574 8.6 HIGH pptp: ensure minimal skb length in pptp_xmit()
CVE-2025-38571 8.2 HIGH sunrpc: fix client side handling of tls alerts
CVE-2025-38595 7.8 HIGH xen: fix UAF in dmabuf_exp_from_pages()
CVE-2025-38580 7.8 HIGH ext4: fix inode use after free in ext4_end_io_rsv_work()
CVE-2025-38607 7.8 HIGH bpf: handle jset (if a & b ...) as a jump in CFG computation
CVE-2025-38614 7.8 HIGH eventpoll: Fix semi-unbounded recursion
CVE-2025-38615 7.8 HIGH fs/ntfs3: cancle set bad inode after removing name fails
CVE-2025-38604 7.8 HIGH wifi: rtl818x: Kill URBs before clearing tx status queue
CVE-2025-38593 7.8 HIGH Bluetooth: hci_sync: fix double free in 'hci_discovery_filter_clear()'
CVE-2025-38586 7.8 HIGH bpf, arm64: Fix fp initialization for exception boundary
CVE-2025-38582 7.8 HIGH RDMA/hns: Fix double destruction of rsv_qp
CVE-2025-38555 7.8 HIGH usb: gadget : fix use-after-free in composite_dev_cleanup()

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38562

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