CVE-2026-62435— grant-table: version change racing with other operations
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-62435
Vulnerability Information
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Vulnerability Title
grant-table: version change racing with other operations
Source: CVE Program / CVE List V5
Vulnerability Description
[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] With the introduction of Grant Table v2 came the requirement to be able to switch between versions. Switching from v1 to v2 reduces the number of valid grant references, as a bigger shared entry structure is then needed while the shared table doesn't change size. Switching from v2 back to v1 the status frames, which are separate in v2, go away. Code holding, but intermediately dropping and then re-acquiring the grant table lock, sometimes wrongly assumes that said properties wouldn't change across the window in time where the lock is not being held. The v1 -> v2 issue is CVE-2026-62435. The v2 -> v1 issue is CVE-2026-62436.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Xen 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xen是Xen组织开源的一款开源的虚拟机监视器产品。该产品能够使不同和不兼容的操作系统运行在同一台计算机上,并支持在运行时进行迁移,保证正常运行并且避免宕机。 Xen存在安全漏洞，该漏洞源于grant表版本切换时的竞争条件，可能导致未授权客户机提升权限、信息泄露和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-62435
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Vendor Advisories for CVE-2026-62435 (1)
Same Patch Batch · Xen · 2026-07-28 · 18 CVEs total
| CVE-2026-62425 | buffer overruns in libfsimage iso9660 handling | |
| CVE-2026-62430 | x86: Out-of-bounds read in vRTC emulation | |
| CVE-2026-62432 | evtchn: Race between FIFO expand and reset | |
| CVE-2026-62429 | vNUMA domain cleanup may race other operations | |
| CVE-2026-62433 | correct buffer checks for DM_OP hypercalls | |
| CVE-2026-62428 | grant-table: type confusion in grant-copy | |
| CVE-2026-62431 | Viridian STIMER division by zero | |
| CVE-2026-62424 | buffer overruns in libfsimage iso9660 handling | |
| CVE-2026-62423 | buffer overruns in libfsimage iso9660 handling | |
| CVE-2026-42495 | buffer overruns in libfsimage iso9660 handling | |
| CVE-2026-62434 | PoD: Don't try to reclaim special pages | |
| CVE-2026-62426 | sysctl and platform-op locks open to abuse | |
| CVE-2026-62436 | grant-table: version change racing with other operations | |
| CVE-2026-62427 | sysctl and platform-op locks open to abuse | |
| CVE-2026-42494 | buffer overruns in libfsimage iso9660 handling | |
| CVE-2026-42492 | vIRQ event channel binding may break Xenstore | |
| CVE-2026-42493 | x86 shadow paging is deprecated |
IV. Related Vulnerabilities
V. Comments for CVE-2026-62435
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