Answer in brief
CVE-2021-47248 records a High severity (CVSS 7.8) vulnerability in udp: fix race between close() and udp_abort(). 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 7.8. 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:5.13:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5d77dca82839ef016a93ad7acd7058b14d967752 <e3c36c773aed0fef8b1d3d555b43393ec564400f || >=5d77dca82839ef016a93ad7acd7058b14d967752 <a0882f68f54f7a8b6308261acee9bd4faab5a69e || >=5d77dca82839ef016a93ad7acd7058b14d967752 <2f73448041bd0682d4b552cfd314ace66107f1ad || >=5d77dca82839ef016a93ad7acd7058b14d967752 <5a88477c1c85e4baa51e91f2d40f2166235daa56 || >=5d77dca82839ef016a93ad7acd7058b14d967752 <8729ec8a2238152a4afc212a331a6cd2c61aeeac || >=5d77dca82839ef016a93ad7acd7058b14d967752 <65310b0aff86980a011c7c7bfa487a333d4ca241 || >=5d77dca82839ef016a93ad7acd7058b14d967752 <a8b897c7bcd47f4147d066e22cc01d1026d7640e | e3c36c773aed0fef8b1d3d555b43393ec564400f, a0882f68f54f7a8b6308261acee9bd4faab5a69e, 2f73448041bd0682d4b552cfd314ace66107f1ad, 5a88477c1c85e4baa51e91f2d40f2166235daa56, 8729ec8a2238152a4afc212a331a6cd2c61aeeac, 65310b0aff86980a011c7c7bfa487a333d4ca241, a8b897c7bcd47f4147d066e22cc01d1026d7640e |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup(). The root cause is udp_abort() racing with close(). Both racing functions acquire the socket lock, but udp{v6}_destroy_sock() release it before performing destructive actions. We can't easily extend the socket lock scope to avoid the race, instead use the SOCK_DEAD flag to prevent udp_abort from doing any action when the critical race happens. Diagnosed-and-tested-by: Kaustubh Pandey <[email protected]>
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47248 records a High severity (CVSS 7.8) vulnerability in udp: fix race between close() and udp_abort(). 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 7.8. 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:5.13:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:5.13:rc6:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5d77dca82839ef016a93ad7acd7058b14d967752 <e3c36c773aed0fef8b1d3d555b43393ec564400f || >=5d77dca82839ef016a93ad7acd7058b14d967752 <a0882f68f54f7a8b6308261acee9bd4faab5a69e || >=5d77dca82839ef016a93ad7acd7058b14d967752 <2f73448041bd0682d4b552cfd314ace66107f1ad || >=5d77dca82839ef016a93ad7acd7058b14d967752 <5a88477c1c85e4baa51e91f2d40f2166235daa56 || >=5d77dca82839ef016a93ad7acd7058b14d967752 <8729ec8a2238152a4afc212a331a6cd2c61aeeac || >=5d77dca82839ef016a93ad7acd7058b14d967752 <65310b0aff86980a011c7c7bfa487a333d4ca241 || >=5d77dca82839ef016a93ad7acd7058b14d967752 <a8b897c7bcd47f4147d066e22cc01d1026d7640e | e3c36c773aed0fef8b1d3d555b43393ec564400f, a0882f68f54f7a8b6308261acee9bd4faab5a69e, 2f73448041bd0682d4b552cfd314ace66107f1ad, 5a88477c1c85e4baa51e91f2d40f2166235daa56, 8729ec8a2238152a4afc212a331a6cd2c61aeeac, 65310b0aff86980a011c7c7bfa487a333d4ca241, a8b897c7bcd47f4147d066e22cc01d1026d7640e |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup(). The root cause is udp_abort() racing with close(). Both racing functions acquire the socket lock, but udp{v6}_destroy_sock() release it before performing destructive actions. We can't easily extend the socket lock scope to avoid the race, instead use the SOCK_DEAD flag to prevent udp_abort from doing any action when the critical race happens. Diagnosed-and-tested-by: Kaustubh Pandey <[email protected]>
Quoted source text, attributed separately from HOL analysis.