CVE-2026-46300
In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain the same externally-owned or page-cache-backed frags, but the shared-frag marker is currently lost. That breaks the invariant relied on by later in-place writers. In particular, ESP input checks skb_has_shared_frag() before deciding whether an uncloned nonlinear skb can skip skb_cow_data(). If TCP receive coalescing has moved shared frags into an unmarked skb, ESP can see skb_has_shared_frag() as false and decrypt in place over page-cache backed frags. Propagate SKBFL_SHARED_FRAG when skb_try_coalesce() transfers paged frags. The tailroom copy path does not need the marker because it copies bytes into @to's linear data rather than transferring frag descriptors.
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CISA says: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Timeline
- Published by NVD
- Added to CISA known exploited list
- Last updated by NVD
- First covered by RedTeamDaily
Affected products
| Product | Versions |
|---|---|
| Linux Linux Kernel | from 3.9 to 5.10.257; from 5.11 to before 5.15.208; from 5.16 to before 6.1.174; from 6.13 to before 6.18.33; from 6.19 to before 7.0.10; from 6.2 to before 6.6.141 and 5 more |
| Redhat Enterprise Linux | 10.0 only; 6.0 only; 7.0 only; 8.0 only; 9.0 only |
| Redhat Enterprise Linux Aus | 8.4 only; 8.6 only |
| Redhat Enterprise Linux Eus | 10.0 only; 8.4 only; 9.4 only; 9.6 only |
| Redhat Enterprise Linux Tus | 8.6 only; 8.8 only |
| Redhat Enterprise Linux Update Services For Sap Solutions | 8.6 only; 8.8 only; 9.0 only; 9.2 only; 9.4 only |
| Redhat Openshift Container Platform | from 4.12 to before 4.12.91; from 4.13 to before 4.13.67; from 4.14 to before 4.14.68; from 4.15 to before 4.15.65; from 4.16 to before 4.16.63; from 4.17 to before 4.17.55 and 4 more |
| Siemens Simatic S7-1500 Cpu 1518-4 Pn/Dp Mfp Firmware | from 3.1.5 to 3.1.6 |
Coverage
Sources: NVD and CISA known exploited vulnerabilities catalogue.