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CVE-2026-74275 (GCVE-0-2026-74275)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:45
VLAI
Title
cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()
Summary
In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach() In cxl_cancel_auto_attach(), it assumes cxled->pos is a valid index for accessing p->targets[]. However, cxled->pos can be set to negative errno in cxl_region_sort_targets() if cxl_calc_interleave_pos() fails. This causes the driver to use a negative index to access p->targets[], resulting in out-of-bounds access. Fix it by walking p->targets[] instead of using cxled->pos directly.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 87805c32e6ad7b5ce2d9f7f47e76081857a4a335 , < 44b2397eb67b7f728640989a22d062e41f94ab64 (git)
Affected: 87805c32e6ad7b5ce2d9f7f47e76081857a4a335 , < cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3 (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The flaw is in the CXL region driver reached via local kernel paths\u2014CXL endpoint decoder auto-discovery/attach, sysfs region/target management under /sys/bus/cxl/, and PCI/CXL device removal\u2014not via any network protocol or remote packet handler.\nAC:L - Once CXL auto-region assembly fails in cxl_region_sort_targets() leaving a decoder AUTO_STAGED with a negative cxled-\u003epos, an attacker who can present or remove CXL endpoints can reliably trigger cxl_cancel_auto_attach() during decoder teardown without uncontrollable timing or memory-layout dependencies.\nPR:N - The vulnerable teardown path runs automatically during kernel-driven CXL endpoint decoder unregistration after failed auto-assembly; it does not require authenticated access or elevated credentials, only that a CXL topology causes cxl_calc_interleave_pos() to fail before the decoder is removed.\nUI:N - Exploitation requires no end-user interaction such as opening files or mounting filesystems; it is triggered by kernel CXL auto-discovery, region assembly failure, and subsequent endpoint decoder detach/unregister events.\nS:U - The out-of-bounds access corrupts kernel cxl_region_params memory within the same kernel security boundary and does not by itself cross VM, container, or IOMMU isolation boundaries.\nC:H - cxl_region_by_target() performs an out-of-bounds read using the negative cxled-\u003epos as an index into p-\u003etargets[], leaking adjacent kernel memory from the cxl_region_params structure before the array base.\nI:H - cxl_cancel_auto_attach() writes NULL via p-\u003etargets[pos] using the same negative index, corrupting adjacent fields such as the region resource pointer and other cxl_region_params metadata exploitable for further memory corruption.\nA:H - Out-of-bounds access and corruption of critical region metadata pointers can cause kernel oops, panic, or hang during CXL region teardown on systems with CONFIG_CXL_REGION and interleaved CXL memory expanders."
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        "dateUpdated": "2026-08-17T05:45:17.863Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/44b2397eb67b7f728640989a22d062e41f94ab64"
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          "url": "https://git.kernel.org/stable/c/cbda6a2c2bec2a5fb30a2ce85baeab15b5fc7db3"
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    "datePublished": "2026-08-15T05:57:47.455Z",
    "dateReserved": "2026-08-15T05:44:03.879Z",
    "dateUpdated": "2026-08-17T05:45:17.863Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
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      "current_release_date": "2026-08-20T15:04:26+00:00",
      "cve": "CVE-2026-74275",
      "id": "CVE-2026-74275",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
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      "title": "kernel: cxl/region: Fix out-of-bounds access in cxl_cancel_auto_attach()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74275.json",
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    }
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}



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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.
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  • 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.


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