KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
Summary
| CVE | CVE-2021-47060 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2024-02-29 23:15:07 UTC |
| Updated | 2026-08-04 10:16:43 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 6 MEDIUM from ADP
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
Problem Types: NVD-CWE-noinfo | CWE-noinfo Not enough information
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 6 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 6 | MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
HighUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d 7d1bc32d6477ff96a32695ea4be8144e4513ab2d git | Not specified |
| CNA | Linux | Linux | affected f65886606c2d3b562716de030706dfe1bea4ed5e 2a20592baff59c5351c5200ec667e1a2aa22af85 git | Not specified |
| CNA | Linux | Linux | affected f65886606c2d3b562716de030706dfe1bea4ed5e 168e82f640ed1891a700bdb43e37da354b2ab63c git | Not specified |
| CNA | Linux | Linux | affected f65886606c2d3b562716de030706dfe1bea4ed5e 50cbad42bfea8c052b7ca590bd4126cdc898713c git | Not specified |
| CNA | Linux | Linux | affected f65886606c2d3b562716de030706dfe1bea4ed5e 5d3c4c79384af06e3c8e25b7770b6247496b4417 git | Not specified |
| CNA | Linux | Linux | affected f0dfffce3f4ffd5f822568a4a6fb34c010e939d1 git | Not specified |
| CNA | Linux | Linux | affected 840e124f89a5127e7eb97ebf377f4b8ca745c070 git | Not specified |
| CNA | Linux | Linux | affected 40a023f681befd9b2862a3c16fb306a38b359ae5 git | Not specified |
| CNA | Linux | Linux | affected 19184bd06f488af62924ff1747614a8cb284ad63 git | Not specified |
| CNA | Linux | Linux | affected 68c125324b5e1d1d22805653735442923d896a1d git | Not specified |
| CNA | Linux | Linux | affected 5.4.66 5.4.119 semver | Not specified |
| CNA | Linux | Linux | affected 4.4.238 4.5 semver | Not specified |
| CNA | Linux | Linux | affected 4.9.238 4.10 semver | Not specified |
| CNA | Linux | Linux | affected 4.14.200 4.15 semver | Not specified |
| CNA | Linux | Linux | affected 4.19.148 4.20 semver | Not specified |
| CNA | Linux | Linux | affected 5.8.10 5.9 semver | Not specified |
| CNA | Linux | Linux | affected 5.9 | Not specified |
| CNA | Linux | Linux | unaffected 5.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.4.119 5.4.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.37 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.11.21 5.11.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.12.4 5.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.13 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.