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CVE-2026-80680 (GCVE-0-2026-80680)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:52 – Updated: 2026-08-29 06:22
VLAI
Title
i2c: amd-mp2: Unregister callback on adapter add failure
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: amd-mp2: Unregister callback on adapter add failure amd_mp2_register_cb() stores the platform I2C context in the MP2 PCI driver's callback table before the adapter is registered. If i2c_add_adapter() fails, probe returns and devres frees the context, but the PCI driver can still dereference the stale pointer from its IRQ and system-sleep callbacks. Unregister the callback before returning the adapter registration error.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 529766e0a0114438887382a68d97341fbf8349fb , < 9142a3dcff0d80a3a24ce159aee19ddc869d9784 (git)
Affected: 529766e0a0114438887382a68d97341fbf8349fb , < 2f7789b3a9628819ebf90bcba8f9da3c139f8687 (git)
Affected: 529766e0a0114438887382a68d97341fbf8349fb , < 4786d4d70dcd1e6b7e044f2348e00f201947b69c (git)
Affected: 529766e0a0114438887382a68d97341fbf8349fb , < b7c2c5c8868737926410b93d1223ada17625ead3 (git)
Affected: 529766e0a0114438887382a68d97341fbf8349fb , < cf107c5983dc70fcf932a305581a5f976d908ff1 (git)
Affected: 529766e0a0114438887382a68d97341fbf8349fb , < 1883a09a37fed497b9efacf736c23624a472246b (git)
Affected: 529766e0a0114438887382a68d97341fbf8349fb , < 8bf719659406e4a1b56d441e0c7da2085d891d96 (git)
Affected: 529766e0a0114438887382a68d97341fbf8349fb , < 82048795242f04275a3f49ffc66ad851b6120954 (git)
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Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: amd-mp2: Unregister callback on adapter add failure\n\namd_mp2_register_cb() stores the platform I2C context in the MP2 PCI\ndriver\u0027s callback table before the adapter is registered. If\ni2c_add_adapter() fails, probe returns and devres frees the context,\nbut the PCI driver can still dereference the stale pointer from its IRQ\nand system-sleep callbacks.\n\nUnregister the callback before returning the adapter registration error."
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              "value": "AV:L - The flaw is in AMD MP2 platform-driver probe teardown and PCI IRQ/system-sleep callbacks, reachable only via local suspend/resume or MP2 hardware interrupts on affected Ryzen laptops; there is no network, Bluetooth, or userspace I2C ioctl path to the stale callback table.\nAC:L - Once i2c_add_adapter() fails the dangling busses[] pointer is deterministic; an attacker can force that registration failure with memory pressure or driver rebind on modular builds, then reliably trigger the UAF through system suspend or MP2 IRQ without uncontrollable races.\nPR:L - After the flawed probe error path leaves the stale callback registered, local users can invoke system suspend via logind/systemctl without init-namespace root, and MP2 IRQs can fire from the already-enabled bus; per CNA guidance Low is used when probe/bind privilege gating is ambiguous.\nUI:N - Exploitation requires no separate victim action; the attacker triggers suspend themselves or relies on automatic MP2 hardware interrupts from an enabled bus, without needing another user to mount filesystems or open files.\nS:U - Impact is host-kernel heap corruption and privilege escalation from stale callback dereference; it does not cross VM, IOMMU, or sandbox security boundaries.\nC:H - The IRQ handler writes into freed amd_i2c_common memory and invokes cmd_completion from the stale object; this UAF provides attacker-influenced heap reuse and arbitrary kernel read primitives per kernel CNA UAF guidance.\nI:H - Suspend/resume and IRQ paths call function pointers through the freed amd_i2c_common structure, enabling control-flow hijack and heap corruption consistent with exploitable UAF write primitives.\nA:H - Stale callback dereference in IRQ or system-sleep paths causes kernel oops/panic and loss of availability; UAF heap corruption can also hang or crash affected AMD MP2 systems on every suspend or interrupt."
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "i2c: amd-mp2: Unregister callback on adapter add failure",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80680.json",
      "version": "2"
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If\\ni2c_add_adapter() fails, probe returns and devres frees the context,\\nbut the PCI driver can still dereference the stale pointer from its IRQ\\nand system-sleep callbacks.\\n\\nUnregister the callback before returning the adapter registration error.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/i2c/busses/i2c-amd-mp2-plat.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"9142a3dcff0d80a3a24ce159aee19ddc869d9784\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"2f7789b3a9628819ebf90bcba8f9da3c139f8687\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"4786d4d70dcd1e6b7e044f2348e00f201947b69c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"b7c2c5c8868737926410b93d1223ada17625ead3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"cf107c5983dc70fcf932a305581a5f976d908ff1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"1883a09a37fed497b9efacf736c23624a472246b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"8bf719659406e4a1b56d441e0c7da2085d891d96\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"529766e0a0114438887382a68d97341fbf8349fb\",\"lessThan\":\"82048795242f04275a3f49ffc66ad851b6120954\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/i2c/busses/i2c-amd-mp2-plat.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1883a09a37fed497b9efacf736c23624a472246b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2f7789b3a9628819ebf90bcba8f9da3c139f8687\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4786d4d70dcd1e6b7e044f2348e00f201947b69c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82048795242f04275a3f49ffc66ad851b6120954\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8bf719659406e4a1b56d441e0c7da2085d891d96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9142a3dcff0d80a3a24ce159aee19ddc869d9784\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7c2c5c8868737926410b93d1223ada17625ead3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf107c5983dc70fcf932a305581a5f976d908ff1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
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      "current_release_date": "2026-08-31T14:12:54+00:00",
      "cve": "CVE-2026-80680",
      "id": "CVE-2026-80680",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: i2c: amd-mp2: Unregister callback on adapter add failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80680.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-04T00:21:54Z",
      "cve": "CVE-2026-80680",
      "id": "CVE-2026-80680",
      "initial_release_date": "2026-08-28T16:34:20Z",
      "product_status:known_affected": "176",
      "product_status:known_not_affected": "177",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80680",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80680.json",
      "version": "5"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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