CVE-2022-50257 Vulnerability Analysis & Exploit Details

CVE-2022-50257
Vulnerability Scoring

5.5

/10

Significant Risk

Security assessments indicate that CVE-2022-50257 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Local
Vulnerability requires local system access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2022-50257 Details

Status: Analyzed

Last updated: 🕔 25 Nov 2025, 17:02 UTC
Originally published on: 🕑 15 Sep 2025, 14:15 UTC

Time between publication and last update: 71 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVE-2022-50257 Vulnerability Summary

CVE-2022-50257: In the Linux kernel, the following vulnerability has been resolved: xen/gntdev: Prevent leaking grants Prior to this commit, if a grant mapping operation failed partially, some of the entries in the map_ops array would be invalid, whereas all of the entries in the kmap_ops array would be valid. This in turn would cause the following logic in gntdev_map_grant_pages to become invalid: for (i = 0; i < map->count; i++) { if (map->map_ops[i].status == GNTST_okay) { map->unmap_ops[i].handle = map->map_ops[i].handle; if (!use_ptemod) alloced++; } if (use_ptemod) { if (map->kmap_ops[i].status == GNTST_okay) { if (map->map_ops[i].status == GNTST_okay) alloced++; map->kunmap_ops[i].handle = map->kmap_ops[i].handle; } } } ... atomic_add(alloced, &map->live_grants); Assume that use_ptemod is true (i.e., the domain mapping the granted pages is a paravirtualized domain). In the code excerpt above, note that the "alloced" variable is only incremented when both kmap_ops[i].status and map_ops[i].status are set to GNTST_okay (i.e., both mapping operations are successful). However, as also noted above, there are cases where a grant mapping operation fails partially, breaking the assumption of the code excerpt above. The aforementioned causes map->live_grants to be incorrectly set. In some cases, all of the map_ops mappings fail, but all of the kmap_ops mappings succeed, meaning that live_grants may remain zero. This in turn makes it impossible to unmap the successfully grant-mapped pages pointed to by kmap_ops, because unmap_grant_pages has the following snippet of code at its beginning: if (atomic_read(&map->live_grants) == 0) return; /* Nothing to do */ In other cases where only some of the map_ops mappings fail but all kmap_ops mappings succeed, live_grants is made positive, but when the user requests unmapping the grant-mapped pages, __unmap_grant_pages_done will then make map->live_grants negative, because the latter function does not check if all of the pages that were requested to be unmapped were actually unmapped, and the same function unconditionally subtracts "data->count" (i.e., a value that can be greater than map->live_grants) from map->live_grants. The side effects of a negative live_grants value have not been studied. The net effect of all of this is that grant references are leaked in one of the above conditions. In Qubes OS v4.1 (which uses Xen's grant mechanism extensively for X11 GUI isolation), this issue manifests itself with warning messages like the following to be printed out by the Linux kernel in the VM that had granted pages (that contain X11 GUI window data) to dom0: "g.e. 0x1234 still pending", especially after the user rapidly resizes GUI VM windows (causing some grant-mapping operations to partially or completely fail, due to the fact that the VM unshares some of the pages as part of the window resizing, making the pages impossible to grant-map from dom0). The fix for this issue involves counting all successful map_ops and kmap_ops mappings separately, and then adding the sum to live_grants. During unmapping, only the number of successfully unmapped grants is subtracted from live_grants. The code is also modified to check for negative live_grants values after the subtraction and warn the user.

Assessing the Risk of CVE-2022-50257

Access Complexity Graph

The exploitability of CVE-2022-50257 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2022-50257

CVE-2022-50257 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2022-50257, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2022-50257, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2022-50257 has no significant impact on data confidentiality.
Integrity: None
CVE-2022-50257 poses no threat to data integrity.
Availability: High
CVE-2022-50257 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2022-50257 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

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cpe:2.3:o:linux:linux_kernel:5.18.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.17:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.17:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.18:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.18:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.19:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18.19:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc9:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.18:rc9:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.10:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.10:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.12:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.12:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.13:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.13:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc8:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc8:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2022-50257: Combat Critical CVE Threats

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