Vulnerability-Lookup

RHSA-2026:44004

Vulnerability from csaf_redhat - Published: 2026-07-23 00:55 - Updated: 2026-07-23 09:06

Summary

Red Hat Security Advisory: kpatch-patch-4_18_0-553_109_1, kpatch-patch-4_18_0-553_125_1, kpatch-patch-4_18_0-553_53_1, kpatch-patch-4_18_0-553_72_1, and kpatch-patch-4_18_0-553_85_1 security update

Severity

Important

Notes

Topic: An update for multiple packages is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-553.53.1.el8_10. Security Fix(es): * kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-53359

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) x86 shadow paging mechanism. This vulnerability occurs when a host page directory entry (PDE) mapping is changed from within the guest, leading to an unexpected role mismatch in shadow paging. This mismatch can cause a use-after-free condition, where the system attempts to access memory that has already been released. Such a condition can lead to system instability, denial of service, potentially the execution of arbitrary code or guest-to-host escape.

7.8 (High)


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

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 35 products

Product	Version	Remediation
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_109_1-0:1-7.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_109_1-0:1-7.el8_10.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_109_1-0:1-7.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_109_1-debuginfo-0:1-7.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_109_1-debuginfo-0:1-7.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_109_1-debugsource-0:1-7.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_109_1-debugsource-0:1-7.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_125_1-0:1-4.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_125_1-0:1-4.el8_10.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_125_1-0:1-4.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_125_1-debuginfo-0:1-4.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_125_1-debuginfo-0:1-4.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_125_1-debugsource-0:1-4.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_125_1-debugsource-0:1-4.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_53_1-0:1-14.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_53_1-0:1-14.el8_10.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_53_1-0:1-14.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_53_1-debuginfo-0:1-14.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_53_1-debuginfo-0:1-14.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_53_1-debugsource-0:1-14.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_53_1-debugsource-0:1-14.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_72_1-0:1-11.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_72_1-0:1-11.el8_10.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_72_1-0:1-11.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_72_1-debuginfo-0:1-11.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_72_1-debuginfo-0:1-11.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_72_1-debugsource-0:1-11.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_72_1-debugsource-0:1-11.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_85_1-0:1-9.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_85_1-0:1-9.el8_10.src	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_85_1-0:1-9.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_85_1-debuginfo-0:1-9.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_85_1-debuginfo-0:1-9.el8_10.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_85_1-debugsource-0:1-9.el8_10.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:kpatch-patch-4_18_0-553_85_1-debugsource-0:1-9.el8_10.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

10 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:44004	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2497033	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-53359	self
https://bugzilla.redhat.com/show_bug.cgi?id=2497033	external
https://www.cve.org/CVERecord?id=CVE-2026-53359	external
https://nvd.nist.gov/vuln/detail/CVE-2026-53359	external
https://lore.kernel.org/linux-cve-announce/202607…	external
https://www.openwall.com/lists/oss-security/2026/…	external

JSON

To clipboard

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      "title": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role"
    }
  ]
}

CVE-2026-53359 (GCVE-0-2026-53359)

Vulnerability from cvelistv5 – Published: 2026-07-04 11:51 – Updated: 2026-07-18 07:33

Title

KVM: x86: Fix shadow paging use-after-free due to unexpected role

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Fix shadow paging use-after-free due to unexpected role Commit 0cb2af2ea66ad ("KVM: x86: Fix shadow paging use-after-free due to unexpected GFN") fixed a shadow paging mismatch between stored and computed GFNs; the bug could be triggered by changing a PDE mapping from outside the guest, and then deleting a memslot. The rmap_remove() call would miss entries created after the PDE change because the GFN of the leaf SPTE does not match the GFN of the struct kvm_mmu_page. A similar hole however remains if the modified PDE points to a non-leaf page. In this case the gfn can be made to match, but the role does not match: the original large 2MB page creates a kvm_mmu_page with direct=1, while the new 4KB needs a kvm_mmu_page with direct=0. However, kvm_mmu_get_child_sp() does not compare the role, and therefore reuses the page. The next step is installing a leaf (4KB) SPTE on the new path which records an rmap entry under the gfn resolved by the walk. But when that child is zapped its parent kvm_mmu_page has direct=1 and kvm_mmu_page_get_gfn() computes the gfn for the 4KB page as sp->gfn + index instead of using sp->shadowed_translation[] (or sp->gfns[] in older kernels). It therefore fails to remove the recorded entry. When the memslot is dropped the shadow page is freed but the rmap entry survives, as in the scenario that was already fixed. Code that later walks that gfn (dirty logging, MMU notifier invalidation, and so on) dereferences an sptep that lies in the freed page, causing the use-after-free.

Severity

8.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/b1337aae5e194324e…
https://git.kernel.org/stable/c/9291654d69e08542d…
https://git.kernel.org/stable/c/2ad3afa40ac6aa340…
https://git.kernel.org/stable/c/5e470998a23e4c3d8…
https://git.kernel.org/stable/c/1ae7d5a6db6c190ce…
https://git.kernel.org/stable/c/81ccda30b4e83d8f5…
http://www.openwall.com/lists/oss-security/2026/07/06/7

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < b1337aae5e194324e4810d561764e7793f8b3864 (git) Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 9291654d69e08542de37755cebe4d5b02c3170d1 (git) Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 2ad3afa40ac6aa340dada122f9abfa46c0a6eb35 (git) Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 5e470998a23e4c3d89ed24e8172cb22747e61efa (git) Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 1ae7d5a6db6c190ce183e3098ca0e0846e14d462 (git) Affected: 2032a93d66fa282ba0f2ea9152eeff9511fa9a96 , < 81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb (git)
Linux	Linux	Affected: 2.6.36 Unaffected: 0 , < 2.6.36 (semver) Unaffected: 6.1.177 , ≤ 6.1.* (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.38 , ≤ 6.18.* (semver) Unaffected: 7.1.3 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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            "arch/x86/kvm/mmu/mmu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.36"
            },
            {
              "lessThan": "2.6.36",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.177",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.144",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.95",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.177",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.144",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.95",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.38",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.3",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2-rc1",
                  "versionStartIncluding": "2.6.36",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Fix shadow paging use-after-free due to unexpected role\n\nCommit 0cb2af2ea66ad (\"KVM: x86: Fix shadow paging use-after-free due\nto unexpected GFN\") fixed a shadow paging mismatch between stored and\ncomputed GFNs; the bug could be triggered by changing a PDE mapping from\noutside the guest, and then deleting a memslot.  The rmap_remove()\ncall would miss entries created after the PDE change because the GFN\nof the leaf SPTE does not match the GFN of the struct kvm_mmu_page.\n\nA similar hole however remains if the modified PDE points to a non-leaf\npage.  In this case the gfn can be made to match, but the role does not\nmatch: the original large 2MB page creates a kvm_mmu_page with direct=1,\nwhile the new 4KB needs a kvm_mmu_page with direct=0.  However,\nkvm_mmu_get_child_sp() does not compare the role, and therefore reuses\nthe page.\n\nThe next step is installing a leaf (4KB) SPTE on the new path which\nrecords an rmap entry under the gfn resolved by the walk.  But when\nthat child is zapped its parent kvm_mmu_page has direct=1 and\nkvm_mmu_page_get_gfn() computes the gfn for the 4KB page as\nsp-\u003egfn + index instead of using sp-\u003eshadowed_translation[] (or sp-\u003egfns[]\nin older kernels).  It therefore fails to remove the recorded entry.\n\nWhen the memslot is dropped the shadow page is freed but the rmap\nentry survives, as in the scenario that was already fixed.  Code that\nlater walks that gfn (dirty logging, MMU notifier invalidation, and\nso on) dereferences an sptep that lies in the freed page, causing the\nuse-after-free."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-18T07:33:28.132Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b1337aae5e194324e4810d561764e7793f8b3864"
        },
        {
          "url": "https://git.kernel.org/stable/c/9291654d69e08542de37755cebe4d5b02c3170d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ad3afa40ac6aa340dada122f9abfa46c0a6eb35"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e470998a23e4c3d89ed24e8172cb22747e61efa"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ae7d5a6db6c190ce183e3098ca0e0846e14d462"
        },
        {
          "url": "https://git.kernel.org/stable/c/81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb"
        }
      ],
      "title": "KVM: x86: Fix shadow paging use-after-free due to unexpected role",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53359",
    "datePublished": "2026-07-04T11:51:49.052Z",
    "dateReserved": "2026-06-09T07:44:35.400Z",
    "dateUpdated": "2026-07-18T07:33:28.132Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

RHSA-2026:44004

CVE-2026-53359 (GCVE-0-2026-53359)

Tags

Sightings

Nomenclature