CVE-2024-35804 (GCVE-0-2024-35804)

Vulnerability from cvelistv5 – Published: 2024-05-17 13:23 – Updated: 2026-08-05 11:30
VLAI
Title
KVM: x86: Mark target gfn of emulated atomic instruction as dirty
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Mark target gfn of emulated atomic instruction as dirty When emulating an atomic access on behalf of the guest, mark the target gfn dirty if the CMPXCHG by KVM is attempted and doesn't fault. This fixes a bug where KVM effectively corrupts guest memory during live migration by writing to guest memory without informing userspace that the page is dirty. Marking the page dirty got unintentionally dropped when KVM's emulated CMPXCHG was converted to do a user access. Before that, KVM explicitly mapped the guest page into kernel memory, and marked the page dirty during the unmap phase. Mark the page dirty even if the CMPXCHG fails, as the old data is written back on failure, i.e. the page is still written. The value written is guaranteed to be the same because the operation is atomic, but KVM's ABI is that all writes are dirty logged regardless of the value written. And more importantly, that's what KVM did before the buggy commit. Huge kudos to the folks on the Cc list (and many others), who did all the actual work of triaging and debugging. base-commit: 6769ea8da8a93ed4630f1ce64df6aafcaabfce64
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: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d97c0667c1e61ded6639117b4b9584a9c12b7e66 , < a9bd6bb6f02bf7132c1ab192ba62bbfa52df7d66 (git)
Affected: 1c2361f667f3648855ceae25f1332c18413fdb9f , < 726374dde5d608b15b9756bd52b6fc283fda7a06 (git)
Affected: 1c2361f667f3648855ceae25f1332c18413fdb9f , < 9d1b22e573a3789ed1f32033ee709106993ba551 (git)
Affected: 1c2361f667f3648855ceae25f1332c18413fdb9f , < 225d587a073584946c05c9b7651d637bd45c0c71 (git)
Affected: 1c2361f667f3648855ceae25f1332c18413fdb9f , < 910c57dfa4d113aae6571c2a8b9ae8c430975902 (git)
Affected: b0f294103f4cf733e23d3f0c4e5fd58e42998921 (git)
Affected: e964665cc7ca13a16992b205fce63554b9efc78b (git)
Affected: 5.15.58 , < 5.15.154 (semver)
Affected: 5.17.13 , < 5.18 (semver)
Affected: 5.18.2 , < 5.19 (semver)
Create a notification for this product.
Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 5.15.154 , ≤ 5.15.* (semver)
Unaffected: 6.1.84 , ≤ 6.1.* (semver)
Unaffected: 6.6.24 , ≤ 6.6.* (semver)
Unaffected: 6.7.12 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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Felicitaciones enormes a las personas en la lista Cc (y a muchos otros), que hicieron todo el trabajo de clasificaci\u00f3n y depuraci\u00f3n. confirmaci\u00f3n base: 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T22:48:26+00:00",
      "cve": "CVE-2024-35804",
      "id": "CVE-2024-35804",
      "initial_release_date": "2024-05-17T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: x86: Mark target gfn of emulated atomic instruction as dirty",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-35804.json",
      "version": "3"
    },
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No remote protocol handler in the host reaches this path.\\nAC:L - The missing dirty-marking is unconditional and deterministic \\u2014 no race, no timing window, and no dependence on memory layout the attacker cannot influence; every emulated atomic write during dirty logging is silently dropped. Live migration and dirty-ring/framebuffer dirty tracking are routine, automated, recurring operations in cloud and virtualization deployments, so an attacker running a shadow-paged or nested workload only has to keep it running for the corruption to occur, and Google observed the defect in ordinary production migrations.\\nPR:L - From the host KVM\u0027s perspective the attacker only needs the ability to run code in a guest, which is a low-privileged position on the vulnerable component. Inside the guest even an unprivileged CPL=3 process suffices, because the guest kernel performs the locked page-table RMWs (`ptep_test_and_clear_young`, `ptep_get_and_clear`, COW/mprotect/fork updates) on its behalf, and those PTE pages are exactly the write-tracked gfns routed to the emulator.\\nUI:N - No victim action is needed \\u2014 dirty logging is enabled by the orchestrator or device model automatically (host maintenance/rebalancing migrations, dirty-ring checkpointing, framebuffer tracking), with no human in the loop. Once logging is active, the guest\u0027s own execution triggers the lost write with no cooperation from anyone else.\\nS:C - The defect lives in the host kernel\u0027s KVM module, but the damage is realized entirely in a different security authority \\u2014 the guest VM\u0027s memory, governed by the guest OS \\u2014 and lets a low-privileged guest context cause corruption of guest-kernel and other-process memory it could never write directly. The write also escapes the host\u0027s dirty-tracking ABI, so state changes cross out of the host hypervisor\u0027s accounting boundary into the guest.\\nC:H - The pages funneled through this path are predominantly write-tracked guest page tables, so a dropped update leaves the migrated guest with a stale PTE that still maps a physical page since reassigned to another process or the kernel, yielding an arbitrary-read window across intra-guest boundaries. Any page whose emulated atomic write is lost also retains its previous contents into a new owner\u0027s security context, exposing data the new owner should never see.\\nI:H - Guest memory is silently corrupted: writes the guest architecturally committed are reverted on the migrated VM, which for page-table pages is a rollback of mapping and permission state (write-protect and accessed/dirty bits) into an arbitrary-write primitive over other processes\u0027 or the kernel\u0027s memory. 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And\\nmore importantly, that\u0027s what KVM did before the buggy commit.\\n\\nHuge kudos to the folks on the Cc list (and many others), who did all the\\nactual work of triaging and debugging.\\n\\nbase-commit: 6769ea8da8a93ed4630f1ce64df6aafcaabfce64\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"5.15.58\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.17.13\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.18.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:30:02.623Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-35804\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:30:02.623Z\", \"dateReserved\": \"2024-05-17T12:19:12.341Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-17T13:23:12.895Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.