Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-23220— ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths

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，该漏洞源于错误路径中重置next_smb2_rcv_hdr_off，可能导致无限循环。

AI Predicted 7.5 Difficulty: Easy EPSS 0.14% · P3

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4b9b7ea1ffb1e34f01fa5726d0c184931b9ba565< 544adb0a6658ea1bff4064723761dbf05f95b1e2 affected
943cebf9ea3415ddefcd670d24d8883e97ba3d60< fb3b66bd72deb5543addaefa67963b34fb163a7b affected
be0f89d4419dc5413a1cf06db3671c9949be0d52< 5accdc5b7f28a81bbc5880ac0b8886e60c86e8c8 affected
be0f89d4419dc5413a1cf06db3671c9949be0d52< f7b1c2f5642bbd60b1beef1f3298cbac81eb232c affected
be0f89d4419dc5413a1cf06db3671c9949be0d52< 71b5e7c528315ca360a1825a4ad2f8ae48c5dc16 affected
be0f89d4419dc5413a1cf06db3671c9949be0d52< 9135e791ec2709bcf0cda0335535c74762489498 affected
be0f89d4419dc5413a1cf06db3671c9949be0d52< 010eb01ce23b34b50531448b0da391c7f05a72af affected
5.15.145< 5.15.203 affected
… +10 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-23220

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths The problem occurs when a signed request fails smb2 signature verification check. In __process_request(), if check_sign_req() returns an error, set_smb2_rsp_status(work, STATUS_ACCESS_DENIED) is called. set_smb2_rsp_status() set work->next_smb2_rcv_hdr_off as zero. By resetting next_smb2_rcv_hdr_off to zero, the pointer to the next command in the chain is lost. Consequently, is_chained_smb2_message() continues to point to the same request header instead of advancing. If the header's NextCommand field is non-zero, the function returns true, causing __handle_ksmbd_work() to repeatedly process the same failed request in an infinite loop. This results in the kernel log being flooded with "bad smb2 signature" messages and high CPU usage. This patch fixes the issue by changing the return value from SERVER_HANDLER_CONTINUE to SERVER_HANDLER_ABORT. This ensures that the processing loop terminates immediately rather than attempting to continue from an invalidated offset.
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，该漏洞源于错误路径中重置next_smb2_rcv_hdr_off，可能导致无限循环。
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 4b9b7ea1ffb1e34f01fa5726d0c184931b9ba565 ~ 544adb0a6658ea1bff4064723761dbf05f95b1e2 -
Linux Linux 6.6 -

II. Public POCs for CVE-2026-23220

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-23220

请登录查看更多情报信息。

Same Patch Batch · Linux · 2026-02-18 · 31 CVEs total

CVE-2026-23230 8.8 HIGH smb: client: split cached_fid bitfields to avoid shared-byte RMW races
CVE-2026-23226 8.8 HIGH ksmbd: add chann_lock to protect ksmbd_chann_list xarray
CVE-2025-71234 8.8 HIGH wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add
CVE-2026-23227 7.8 HIGH drm/exynos: vidi: use ctx->lock to protect struct vidi_context member variables related to
CVE-2026-23225 7.8 HIGH sched/mmcid: Don't assume CID is CPU owned on mode switch
CVE-2026-23224 7.8 HIGH erofs: fix UAF issue for file-backed mounts w/ directio option
CVE-2026-23222 7.8 HIGH crypto: omap - Allocate OMAP_CRYPTO_FORCE_COPY scatterlists correctly
CVE-2025-71236 7.5 HIGH scsi: qla2xxx: Validate sp before freeing associated memory
CVE-2025-71233 PCI: endpoint: Avoid creating sub-groups asynchronously
CVE-2026-23229 crypto: virtio - Add spinlock protection with virtqueue notification
CVE-2026-23228 smb: server: fix leak of active_num_conn in ksmbd_tcp_new_connection()
CVE-2026-23223 xfs: fix UAF in xchk_btree_check_block_owner
CVE-2026-23221 bus: fsl-mc: fix use-after-free in driver_override_show()
CVE-2025-71237 nilfs2: Fix potential block overflow that cause system hang
CVE-2025-71235 scsi: qla2xxx: Delay module unload while fabric scan in progress
CVE-2026-23211 mm, swap: restore swap_space attr aviod kernel panic
CVE-2025-71232 scsi: qla2xxx: Free sp in error path to fix system crash
CVE-2025-71231 crypto: iaa - Fix out-of-bounds index in find_empty_iaa_compression_mode
CVE-2025-71230 hfs: ensure sb->s_fs_info is always cleaned up
CVE-2025-71229 wifi: rtw88: Fix alignment fault in rtw_core_enable_beacon()

Showing top 20 of 31 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23220

No comments yet

Leave a comment