# CVE-2026-98243: linux: In the Linux kernel, the following vulnerability has been resolved:  dma-buf/dma-fence: fix checking signaling bit fo...

CVE-2026-98243 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98243 (version 7.2.8-1), released October 6, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-98243
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 6, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  dma-buf/dma-fence: fix checking signaling bit for timeline and driver name v3  The patch "dma-buf: dma-fence: Fix potential NULL pointer dereference" changed the check to test for the ops pointer instead of the signaled bit to avoid a potential NULL dereference when the ops pointer has been cleared.  The problem is now that the ops pointer is cleared only when neither the release nor the wait callback is implemented and this isn't true for a lot of dma_fence implementations yet. So those implementations lost the RCU protection after signaling of the returned string resulting in potential use after free.  Add the signaling check additional to the ops pointer check so that we have both the protection against NULL dereference as well as the RCU protection after signaling for the returned string.  v2: improve comments to note RCU protection and explain why we check     both signaling state and ops pointer v3: some comment improvements suggested by Philip

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.8-1 | [DEBIAN-CVE-2026-98243](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98243.md) | Oct 6, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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