Answer in brief
CVE-2021-47060 records a High severity (CVSS 7.8) vulnerability in KVM: Stop looking for coalesced MMIO zones if the bus is destroyed. 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 |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d <7d1bc32d6477ff96a32695ea4be8144e4513ab2d || >=f65886606c2d3b562716de030706dfe1bea4ed5e <2a20592baff59c5351c5200ec667e1a2aa22af85 || >=f65886606c2d3b562716de030706dfe1bea4ed5e <168e82f640ed1891a700bdb43e37da354b2ab63c || >=f65886606c2d3b562716de030706dfe1bea4ed5e <50cbad42bfea8c052b7ca590bd4126cdc898713c || >=f65886606c2d3b562716de030706dfe1bea4ed5e <5d3c4c79384af06e3c8e25b7770b6247496b4417 || f0dfffce3f4ffd5f822568a4a6fb34c010e939d1 || 840e124f89a5127e7eb97ebf377f4b8ca745c070 || 40a023f681befd9b2862a3c16fb306a38b359ae5 || 19184bd06f488af62924ff1747614a8cb284ad63 || 68c125324b5e1d1d22805653735442923d896a1d || >=5.4.66 <5.4.119 || >=4.4.238 <4.5 || >=4.9.238 <4.10 || >=4.14.200 <4.15 || >=4.19.148 <4.20 || >=5.8.10 <5.9 | 7d1bc32d6477ff96a32695ea4be8144e4513ab2d, 2a20592baff59c5351c5200ec667e1a2aa22af85, 168e82f640ed1891a700bdb43e37da354b2ab63c, 50cbad42bfea8c052b7ca590bd4126cdc898713c, 5d3c4c79384af06e3c8e25b7770b6247496b4417, 5.4.119, 4.5, 4.10, 4.15, 4.20, 5.9 |
| Linux/Linuxgeneric | 5.9 | Not reported |
Published upstream
Feb 29, 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: KVM: Stop looking for coalesced MMIO zones if the bus is destroyed Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev() fails to allocate memory for the new instance of the bus. If it can't instantiate a new bus, unregister_dev() destroys all devices _except_ the target device. But, it doesn't tell the caller that it obliterated the bus and invoked the destructor for all devices that were on the bus. In the coalesced MMIO case, this can result in a deleted list entry dereference due to attempting to continue iterating on coalesced_zones after future entries (in the walk) have been deleted. Opportunistically add curly braces to the for-loop, which encompasses many lines but sneaks by without braces due to the guts being a single if statement.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47060 records a High severity (CVSS 7.8) vulnerability in KVM: Stop looking for coalesced MMIO zones if the bus is destroyed. 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 |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d <7d1bc32d6477ff96a32695ea4be8144e4513ab2d || >=f65886606c2d3b562716de030706dfe1bea4ed5e <2a20592baff59c5351c5200ec667e1a2aa22af85 || >=f65886606c2d3b562716de030706dfe1bea4ed5e <168e82f640ed1891a700bdb43e37da354b2ab63c || >=f65886606c2d3b562716de030706dfe1bea4ed5e <50cbad42bfea8c052b7ca590bd4126cdc898713c || >=f65886606c2d3b562716de030706dfe1bea4ed5e <5d3c4c79384af06e3c8e25b7770b6247496b4417 || f0dfffce3f4ffd5f822568a4a6fb34c010e939d1 || 840e124f89a5127e7eb97ebf377f4b8ca745c070 || 40a023f681befd9b2862a3c16fb306a38b359ae5 || 19184bd06f488af62924ff1747614a8cb284ad63 || 68c125324b5e1d1d22805653735442923d896a1d || >=5.4.66 <5.4.119 || >=4.4.238 <4.5 || >=4.9.238 <4.10 || >=4.14.200 <4.15 || >=4.19.148 <4.20 || >=5.8.10 <5.9 | 7d1bc32d6477ff96a32695ea4be8144e4513ab2d, 2a20592baff59c5351c5200ec667e1a2aa22af85, 168e82f640ed1891a700bdb43e37da354b2ab63c, 50cbad42bfea8c052b7ca590bd4126cdc898713c, 5d3c4c79384af06e3c8e25b7770b6247496b4417, 5.4.119, 4.5, 4.10, 4.15, 4.20, 5.9 |
| Linux/Linuxgeneric | 5.9 | Not reported |
Published upstream
Feb 29, 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: KVM: Stop looking for coalesced MMIO zones if the bus is destroyed Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev() fails to allocate memory for the new instance of the bus. If it can't instantiate a new bus, unregister_dev() destroys all devices _except_ the target device. But, it doesn't tell the caller that it obliterated the bus and invoked the destructor for all devices that were on the bus. In the coalesced MMIO case, this can result in a deleted list entry dereference due to attempting to continue iterating on coalesced_zones after future entries (in the walk) have been deleted. Opportunistically add curly braces to the for-loop, which encompasses many lines but sneaks by without braces due to the guts being a single if statement.
Quoted source text, attributed separately from HOL analysis.