Answer in brief
CVE-2021-47001 records a High severity (CVSS 7.5) vulnerability in xprtrdma: Fix cwnd update ordering. 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 7.5. 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 |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <eddae8be7944096419c2ae29477a45f767d0fcd4 || >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <8834ecb5df22b7ff3c9b0deba7726579bb613f95 || >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <19b5fa9489b5706bc878c3a522a7f771079e2fa0 || >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <35d8b10a25884050bb3b0149b62c3818ec59f77c || 3791c5982ba1eebf2900ee7ca7b9a89619c26d54 || >=5.4.13 <5.5 | eddae8be7944096419c2ae29477a45f767d0fcd4, 8834ecb5df22b7ff3c9b0deba7726579bb613f95, 19b5fa9489b5706bc878c3a522a7f771079e2fa0, 35d8b10a25884050bb3b0149b62c3818ec59f77c, 5.5 |
| Linux/Linuxgeneric | 5.5 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Fix cwnd update ordering After a reconnect, the reply handler is opening the cwnd (and thus enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs() can post enough Receive WRs to receive their replies. This causes an RNR and the new connection is lost immediately. The race is most clearly exposed when KASAN and disconnect injection are enabled. This slows down rpcrdma_rep_create() enough to allow the send side to post a bunch of RPC Calls before the Receive completion handler can invoke ib_post_recv().
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47001 records a High severity (CVSS 7.5) vulnerability in xprtrdma: Fix cwnd update ordering. 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 7.5. 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 |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <eddae8be7944096419c2ae29477a45f767d0fcd4 || >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <8834ecb5df22b7ff3c9b0deba7726579bb613f95 || >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <19b5fa9489b5706bc878c3a522a7f771079e2fa0 || >=2ae50ad68cd79224198b525f7bd645c9da98b6ff <35d8b10a25884050bb3b0149b62c3818ec59f77c || 3791c5982ba1eebf2900ee7ca7b9a89619c26d54 || >=5.4.13 <5.5 | eddae8be7944096419c2ae29477a45f767d0fcd4, 8834ecb5df22b7ff3c9b0deba7726579bb613f95, 19b5fa9489b5706bc878c3a522a7f771079e2fa0, 35d8b10a25884050bb3b0149b62c3818ec59f77c, 5.5 |
| Linux/Linuxgeneric | 5.5 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: xprtrdma: Fix cwnd update ordering After a reconnect, the reply handler is opening the cwnd (and thus enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs() can post enough Receive WRs to receive their replies. This causes an RNR and the new connection is lost immediately. The race is most clearly exposed when KASAN and disconnect injection are enabled. This slows down rpcrdma_rep_create() enough to allow the send side to post a bunch of RPC Calls before the Receive completion handler can invoke ib_post_recv().
Quoted source text, attributed separately from HOL analysis.