Answer in brief
CVE-2026-63919 records a High severity (CVSS 8.8) vulnerability in xfrm: input: hold netns during deferred transport reinjection. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=7b3801927e52f8621de311277f7fc727635019e7 <7ee59eda8820b758ed29e1cd3222359c7b97302c || >=7b3801927e52f8621de311277f7fc727635019e7 <2df7059a18afb7d3aee6c36cad5d371c198111d4 || >=7b3801927e52f8621de311277f7fc727635019e7 <8dfabcba6a943a7a02ebe1e1637c361ba96acbaa || >=7b3801927e52f8621de311277f7fc727635019e7 <48ce101cd630d6745b6923b5bad8358bc4c119da || >=7b3801927e52f8621de311277f7fc727635019e7 <55ddfc41451f01c588089cd74957a05311b6f202 || >=7b3801927e52f8621de311277f7fc727635019e7 <9f7ebb45a83afc3216e855e57d51bb4bc9b5232e || >=7b3801927e52f8621de311277f7fc727635019e7 <9f67a36e91bb50d358760f381f233913fe5c09f8 || >=7b3801927e52f8621de311277f7fc727635019e7 <c16f74dc1d75d0e2e7670076d5375deda110ebeb | 7ee59eda8820b758ed29e1cd3222359c7b97302c, 2df7059a18afb7d3aee6c36cad5d371c198111d4, 8dfabcba6a943a7a02ebe1e1637c361ba96acbaa, 48ce101cd630d6745b6923b5bad8358bc4c119da, 55ddfc41451f01c588089cd74957a05311b6f202, 9f7ebb45a83afc3216e855e57d51bb4bc9b5232e, 9f67a36e91bb50d358760f381f233913fe5c09f8, c16f74dc1d75d0e2e7670076d5375deda110ebeb |
| Linux/Linuxgeneric | 5.6 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: xfrm: input: hold netns during deferred transport reinjection Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one place for all users of xfrm_trans_queue_net().
Quoted source text, attributed separately from HOL analysis.