Answer in brief
CVE-2025-37879 records a Unknown severity vulnerability in 9p/net: fix improper handling of bogus negative read/write replies. 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 | >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <468ff4a7c61fb811c596a7c44b6a5455e40fd12b || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <a68768e280b7d0c967ea509e791bb9b90adc94a5 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <c548f95688e2b5ae0e2ae43d53cf717156c7d034 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <374e4cd75617c8c2552f562f39dd989583f5c330 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <d0259a856afca31d699b706ed5e2adf11086c73b | 468ff4a7c61fb811c596a7c44b6a5455e40fd12b, a68768e280b7d0c967ea509e791bb9b90adc94a5, c548f95688e2b5ae0e2ae43d53cf717156c7d034, 374e4cd75617c8c2552f562f39dd989583f5c330, d0259a856afca31d699b706ed5e2adf11086c73b |
| Linux/Linuxgeneric | 4.1 | Not reported |
Published upstream
May 9, 2025
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: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed. Make variables unsigned to avoid this problem. The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-37879 records a Unknown severity vulnerability in 9p/net: fix improper handling of bogus negative read/write replies. 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 | >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <468ff4a7c61fb811c596a7c44b6a5455e40fd12b || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <a68768e280b7d0c967ea509e791bb9b90adc94a5 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <c548f95688e2b5ae0e2ae43d53cf717156c7d034 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <374e4cd75617c8c2552f562f39dd989583f5c330 || >=070b3656cf228eaaef7b28b59264c5c7cdbdd0fb <d0259a856afca31d699b706ed5e2adf11086c73b | 468ff4a7c61fb811c596a7c44b6a5455e40fd12b, a68768e280b7d0c967ea509e791bb9b90adc94a5, c548f95688e2b5ae0e2ae43d53cf717156c7d034, 374e4cd75617c8c2552f562f39dd989583f5c330, d0259a856afca31d699b706ed5e2adf11086c73b |
| Linux/Linuxgeneric | 4.1 | Not reported |
Published upstream
May 9, 2025
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: 9p/net: fix improper handling of bogus negative read/write replies In p9_client_write() and p9_client_read_once(), if the server incorrectly replies with success but a negative write/read count then we would consider written (negative) <= rsize (positive) because both variables were signed. Make variables unsigned to avoid this problem. The reproducer linked below now fails with the following error instead of a null pointer deref: 9pnet: bogus RWRITE count (4294967295 > 3)
Quoted source text, attributed separately from HOL analysis.