CVE-2026-52959

Enriched by CISA
 

In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Do not use host-controlled page order in cleanup path When issuing an extended guest request (SVM_VMGEXIT_EXT_GUEST_REQUEST), get_ext_report() allocates a buffer to retrieve a certificate blob from the host, keeping track of its size in report_req->certs_len. However, the host may return SNP_GUEST_VMM_ERR_INVALID_LEN, indicating an invalid buffer size, as well as the expected length of such buffer. get_ext_report() subsequently updates report_req->certs_len with the host-controlled value, and cleans up the buffer by computing a page order from such value. This is incorrect, as the host-provided length may not match the page order of the original allocation, potentially resulting in corruption in the page allocator. Fix this by using alloc_pages_exact() instead, and reusing @npages to compute the size passed to free_pages_exact(). For consistency, also use @npages to compute the size when allocating the pages, even though this last change has no functional effect.
https://nvd.nist.gov/vuln/detail/CVE-2026-52959

Categories

No category defined

References


 

AFFECTED (from MITRE)

Vendor Product Versions
Linux Linux
  • 3e385c0d6ce88ac9916dcf84267bd5855d830748 < 3f6fb0211b39aaa1b841260681dd02ca6b693ed5 [affected]
  • 3e385c0d6ce88ac9916dcf84267bd5855d830748 < 9e48b4f813d2c3db75d522aa82ab705ce04b7e2d [affected]
  • 3e385c0d6ce88ac9916dcf84267bd5855d830748 < 23e6a1ca04ae44806439a5a446e62e4d42e80bb4 [affected]
  • 0b16521f95c875e79d657cb8d6911c15080dbb80 [affected]
  • 6.13.8 < 6.14 [affected]
Linux Linux
  • 6.14 [affected]
  • < 6.14 [unaffected]
  • 6.18.33 ≤ 6.18.* [unaffected]
  • 7.0.10 ≤ 7.0.* [unaffected]
  • 7.1 ≤ * [unaffected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end
Configuration 1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.14 < 6.18.33
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.14 < 7.0.10
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.14 < 7.1
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* >= 6.13.8

REMEDIATION


EXPLOITS

Exploit-db.com

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POC Github

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Other Nist (github, ...)

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CAPEC

Common Attack Pattern Enumerations and Classifications

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