CVE-2026-23220
CVE.org · Published
- Record status
- Published
- Identifier year (not publication year)
- 2026
- Source publication
- Source updated
- Imported by cveboard
- Source snapshot
- cve_2026-10-24_midnight_baseline ·
CNA source text (English)
ksmbd: fix infinite loop caused by next_smb2_rcv_hdr_off reset in error paths
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.
Scoped product and version facts
Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.
Exploitation unknown; this catalogue does not assess exploitation.
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
unaffected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 4b9b7ea1ffb1e34f01fa5726d0c184931b9ba565 | affected | git | 544adb0a6658ea1bff4064723761dbf05f95b1e2 | Unavailable | None listed |
| 943cebf9ea3415ddefcd670d24d8883e97ba3d60 | affected | git | fb3b66bd72deb5543addaefa67963b34fb163a7b | Unavailable | None listed |
| be0f89d4419dc5413a1cf06db3671c9949be0d52 | affected | git | 5accdc5b7f28a81bbc5880ac0b8886e60c86e8c8 | Unavailable | None listed |
| be0f89d4419dc5413a1cf06db3671c9949be0d52 | affected | git | f7b1c2f5642bbd60b1beef1f3298cbac81eb232c | Unavailable | None listed |
| be0f89d4419dc5413a1cf06db3671c9949be0d52 | affected | git | 71b5e7c528315ca360a1825a4ad2f8ae48c5dc16 | Unavailable | None listed |
| be0f89d4419dc5413a1cf06db3671c9949be0d52 | affected | git | 9135e791ec2709bcf0cda0335535c74762489498 | Unavailable | None listed |
| be0f89d4419dc5413a1cf06db3671c9949be0d52 | affected | git | 010eb01ce23b34b50531448b0da391c7f05a72af | Unavailable | None listed |
| 5.15.145 | affected | semver | 5.15.203 | Unavailable | None listed |
| 6.1.71 | affected | semver | 6.1.164 | Unavailable | None listed |
Linux
- Vendor
- Linux
- Product
- Linux
- Platforms
- Unknown
- Default status
affected
| Version (version) | Status (status) | Version scheme (versionType) | Exclusive end (lessThan) | Inclusive end (lessThanOrEqual) | Status changes (at → status) |
|---|---|---|---|---|---|
| 6.6 | affected | Unavailable | Unavailable | Unavailable | None listed |
| 0 | unaffected | semver | 6.6 | Unavailable | None listed |
| 5.15.203 | unaffected | semver | Unavailable | 5.15.* | None listed |
| 6.1.164 | unaffected | semver | Unavailable | 6.1.* | None listed |
| 6.6.125 | unaffected | semver | Unavailable | 6.6.* | None listed |
| 6.12.72 | unaffected | semver | Unavailable | 6.12.* | None listed |
| 6.18.11 | unaffected | semver | Unavailable | 6.18.* | None listed |
| 6.19.1 | unaffected | semver | Unavailable | 6.19.* | None listed |
| 7.0 | unaffected | original_commit_for_fix | Unavailable | * | None listed |