# smb: client: avoid leaking refcount in cifs_queue_oplock_break()

CVE record · `CVE-2026-97557`

- **Identifiers:** `CVE-2026-97557`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 25 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 25 Sept 2026, 10:21 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before 13b9519b19e6e58a6cd01e63062cd1da7bd6449a` (git)
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before 0fb92ac85db58945ad7b970ff17674001487b3a3` (git)
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before 735a3a610136ae10f381d0909dff38e5b5c5f056` (git)
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before de2a6bcff2659bea40c7485115b57f0ae189fc01` (git)
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before af0193bbf1ac8c0f67f972998b0cc629d6116cf6` (git)
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before 2ed2c29dd9593637cfa25ac1eb23241b20202778` (git)
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before dfe7b750c7e069873a8a57a11c816831a235618a` (git)
  - affected: `b98749cac4a695f084a5ff076f4510b23e353ecd to before 9f2e63f1b2d5fc5b5423424902c091123e220e7e` (git)
  - affected: `2429fcf06d3cb962693868ab0a927c9038f12a2d` (git)
  - affected: `1ee4f2d7cdcd4508cc3cbe3b2622d7177b89da12` (git)
  - affected: `53fc31a4853e30d6e8f142b824f724da27ff3e40` (git)
  - affected: `8092ecc306d81186a64cda42411121f4d35aaff4` (git)
  - and 6 more
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.1`
  - unaffected: `before 5.1` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.7 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0070, the 53rd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 25 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-97557](https://www.cve.org/CVERecord?id=CVE-2026-97557)
- [NVD: CVE-2026-97557](https://nvd.nist.gov/vuln/detail/CVE-2026-97557)

### References from the CNA

- <https://git.kernel.org/stable/c/13b9519b19e6e58a6cd01e63062cd1da7bd6449a>
- <https://git.kernel.org/stable/c/0fb92ac85db58945ad7b970ff17674001487b3a3>
- <https://git.kernel.org/stable/c/735a3a610136ae10f381d0909dff38e5b5c5f056>
- <https://git.kernel.org/stable/c/de2a6bcff2659bea40c7485115b57f0ae189fc01>
- <https://git.kernel.org/stable/c/af0193bbf1ac8c0f67f972998b0cc629d6116cf6>
- <https://git.kernel.org/stable/c/2ed2c29dd9593637cfa25ac1eb23241b20202778>
- <https://git.kernel.org/stable/c/dfe7b750c7e069873a8a57a11c816831a235618a>
- <https://git.kernel.org/stable/c/9f2e63f1b2d5fc5b5423424902c091123e220e7e>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-97557>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-97557/>. Everything for agents: <https://agentprime.io/llms.txt>.