ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths

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Summary

CVECVE-2026-23220
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-18 16:22:31 UTC
Updated2026-04-18 09:16:14 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-835

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4b9b7ea1ffb1e34f01fa5726d0c184931b9ba565 544adb0a6658ea1bff4064723761dbf05f95b1e2 git Not specified
CNA Linux Linux affected 943cebf9ea3415ddefcd670d24d8883e97ba3d60 fb3b66bd72deb5543addaefa67963b34fb163a7b git Not specified
CNA Linux Linux affected be0f89d4419dc5413a1cf06db3671c9949be0d52 5accdc5b7f28a81bbc5880ac0b8886e60c86e8c8 git Not specified
CNA Linux Linux affected be0f89d4419dc5413a1cf06db3671c9949be0d52 f7b1c2f5642bbd60b1beef1f3298cbac81eb232c git Not specified
CNA Linux Linux affected be0f89d4419dc5413a1cf06db3671c9949be0d52 71b5e7c528315ca360a1825a4ad2f8ae48c5dc16 git Not specified
CNA Linux Linux affected be0f89d4419dc5413a1cf06db3671c9949be0d52 9135e791ec2709bcf0cda0335535c74762489498 git Not specified
CNA Linux Linux affected be0f89d4419dc5413a1cf06db3671c9949be0d52 010eb01ce23b34b50531448b0da391c7f05a72af git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.164 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.125 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.72 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.11 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.1 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5accdc5b7f28a81bbc5880ac0b8886e60c86e8c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/544adb0a6658ea1bff4064723761dbf05f95b1e2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb3b66bd72deb5543addaefa67963b34fb163a7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/010eb01ce23b34b50531448b0da391c7f05a72af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f7b1c2f5642bbd60b1beef1f3298cbac81eb232c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9135e791ec2709bcf0cda0335535c74762489498 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/71b5e7c528315ca360a1825a4ad2f8ae48c5dc16 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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