Answer in brief
CVE-2026-63919 records a Unknown severity 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.
Answer in brief
CVE-2026-63919 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.