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CVE Record

CVE-2024-26762: cxl/pci: Skip to handle RAS errors if CXL.mem device is detached

In the Linux kernel, the following vulnerability has been resolved: cxl/pci: Skip to handle RAS errors if CXL.mem device is detached The PCI AER model is an awkward fit for CXL error handling. While the expectation is that a PCI device can escalate to link reset to recover from an AER event, the same reset on CXL amounts to a surprise memory hotplug of massive amounts of memory. At present, the CXL error handler attempts some optimistic error handling to unbind the device from the cxl_mem driver after reaping some RAS register values. This results in a "hopeful" attempt to unplug the memory, but there is no guarantee that will succeed. A subsequent AER notification after the memdev unbind event can no longer assume the registers are mapped. Check for memdev bind before reaping status register values to avoid crashes of the form: BUG: unable to handle page fault for address: ffa00000195e9100 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page [...] RIP: 0010:__cxl_handle_ras+0x30/0x110 [cxl_core] [...] Call Trace: <TASK> ? __die+0x24/0x70 ? page_fault_oops+0x82/0x160 ? kernelmode_fixup_or_oops+0x84/0x110 ? exc_page_fault+0x113/0x170 ? asm_exc_page_fault+0x26/0x30 ? __pfx_dpc_reset_link+0x10/0x10 ? __cxl_handle_ras+0x30/0x110 [cxl_core] ? find_cxl_port+0x59/0x80 [cxl_core] cxl_handle_rp_ras+0xbc/0xd0 [cxl_core] cxl_error_detected+0x6c/0xf0 [cxl_core] report_error_detected+0xc7/0x1c0 pci_walk_bus+0x73/0x90 pcie_do_recovery+0x23f/0x330 Longer term, the unbind and PCI_ERS_RESULT_DISCONNECT behavior might need to be replaced with a new PCI_ERS_RESULT_PANIC.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux kernel flaw can crash systems using CXL memory when another PCI error arrives after a CXL.mem device detaches. The handler may access registers that are no longer mapped. This threatens system stability and potentially broader security properties, but the supplied sources provide no evidence of active exploitation.

Executive priority

Treat as a high-priority reliability and security update for CXL-enabled infrastructure. Patch exposed systems during the next urgent maintenance window, accelerating systems with frequent hardware errors or memory hotplug activity. Conventional servers without CXL.mem hardware are less likely to be exposed.

Technical view

After cxl_mem unbind, a subsequent PCI AER notification may invoke CXL RAS handling and read unmapped status registers, causing a kernel page fault. The fix checks whether the memory device remains bound before accessing those registers. CVSS 3.1 is 7.8: local access, low complexity, low privileges, no user interaction.

Likely exposure

Exposure is limited to Linux systems using affected kernels with CXL.mem hardware and the relevant detach, unbind, and subsequent AER error sequence. The record lists Linux 6.7 through 6.7.7 and 6.8 as affected. Distribution backports may change actual status.

Exploitation context

The vulnerability requires local, low-privileged access according to the CVSS vector, plus a specific CXL and PCI error-handling state. It is not listed in KEV, and the supplied sources do not establish public or active exploitation. Practical reachability may depend heavily on hardware and local system controls.

Researcher notes

The vulnerable condition is a stale register-access assumption after memdev unbind. The source describes a supervisor-mode page fault in __cxl_handle_ras during PCIe recovery. The immediate correction adds a bind-state check; the record also notes that longer-term CXL recovery behavior may require redesign. No CWE was supplied.

Mitigation direction

  • Upgrade to a vendor-supported kernel containing the referenced stable fix or an equivalent backport.
  • Check Linux distribution advisories for package-specific fixed versions and reboot requirements.
  • Prioritize CXL.mem hosts where unbind, hotplug, or PCI AER events can occur.
  • Restrict unnecessary local access while affected systems await remediation.

Validation and detection

  • Inventory kernel versions and identify hosts using CXL.mem devices.
  • Confirm the installed kernel package includes either referenced fix or an equivalent vendor backport.
  • Review kernel logs for CXL RAS faults, page faults, or crashes following device detach events.
  • Validate normal CXL error handling after upgrading, using approved non-destructive operational tests.
Prepared
Confidence
high
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2024-26762 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
2ADP providers
3Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-26762Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux6ac07883dbb5f60f7bc56a13b7a84a382aa9c1ab, 6ac07883dbb5f60f7bc56a13b7a84a382aa9c1abunaffected
LinuxLinux6.7, 0, 6.7.7, 6.8affected
Weakness

CWE details

No CWE listed

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