CVE-2026-74461 (GCVE-0-2026-74461)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37
VLAI
Title
i2c: imx: Cancel hrtimer before clearing slave pointer
Summary
In the Linux kernel, the following vulnerability has been resolved: i2c: imx: Cancel hrtimer before clearing slave pointer In i2c_imx_unreg_slave(), the slave pointer is set to NULL after disabling interrupts. However, a pending interrupt might already have started the hrtimer (i2c_imx_slave_timeout) before the pointer was cleared. If the hrtimer fires after i2c_imx->slave is set to NULL, the timer callback i2c_imx_slave_finish_op() will call i2c_imx_slave_event() with a NULL slave pointer, which results in a use-after-free / NULL pointer dereference. Fix by canceling the hrtimer and waiting for it to complete after disabling interrupts, before clearing the slave pointer.
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: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < e3da77bdb4015051656bb472c295656bbea03b6f (git)
Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < 470fe15fb3bb2eba6629be301ca7e991ee3cfb7e (git)
Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < a8a1f9ac3d763e721586f15479ef9140b216ddf3 (git)
Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < 753060f2b77ff2f386addbd3ecadb95b9f90cddd (git)
Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < affd62f5719a78135b7441aa49c8cab3c3b5e838 (git)
Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < dab4762ee7f3fd0a01980d5407ba48d0261d3bff (git)
Affected: f7414cd6923fd7f78e57086fc964ba2dc25db5c1 , < 6ac7702b6cc2b94aaed9ef2d95bfbefcdc90061f (git)
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Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (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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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: imx: Cancel hrtimer before clearing slave pointer\n\nIn i2c_imx_unreg_slave(), the slave pointer is set to NULL after\ndisabling interrupts.  However, a pending interrupt might already\nhave started the hrtimer (i2c_imx_slave_timeout) before the pointer\nwas cleared.  If the hrtimer fires after i2c_imx-\u003eslave is set to\nNULL, the timer callback i2c_imx_slave_finish_op() will call\ni2c_imx_slave_event() with a NULL slave pointer, which results in a\nuse-after-free / NULL pointer dereference.\n\nFix by canceling the hrtimer and waiting for it to complete after\ndisabling interrupts, before clearing the slave pointer."
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              "value": "AV:L - The bug is in the imx I2C slave teardown path reached via i2c_slave_unregister during local driver removal on embedded i.MX systems; exploitation requires local proximity to trigger concurrent I2C bus activity on the same controller.\nAC:L - The attacker controls both sides of the race by generating I2C slave traffic to arm/restart the 30us hrtimer while unregister runs, and can retry rapidly across repeated teardown cycles until the window is hit.\nPR:N - No Linux credentials are required when an attacker with physical access to an exposed I2C bus races automated system maintenance (OTA, service restart, driver reload) that calls i2c_slave_unregister on imx slave backends.\nUI:N - Exploitation does not require victim interaction; automated firmware updates or service restarts that unregister the slave driver are sufficient to create the teardown side of the race.\nS:U - Impact is confined to kernel memory corruption and crash on the same host; this is not a VM escape, IOMMU bypass, or cross-security-authority boundary.\nC:H - The timer callback invokes i2c_slave_event with a NULL/freed slave pointer (use-after-free), a memory safety violation that can be leveraged for arbitrary kernel memory read primitives per CVSS UAF guidance.\nI:H - Use-after-free in the slave event callback path can enable heap manipulation and arbitrary kernel write or control-flow hijack, not merely a deterministic NULL dereference crash.\nA:H - Triggering i2c_slave_event with a NULL slave causes kernel oops/panic, and the original patch series notes the last_slave_event loop in i2c_imx_slave_finish_op can hang the system."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74461",
    "datePublished": "2026-08-15T12:27:01.924Z",
    "dateReserved": "2026-08-15T05:44:03.901Z",
    "dateUpdated": "2026-08-19T16:37:00.344Z",
    "state": "PUBLISHED"
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "i2c: imx: Cancel hrtimer before clearing slave pointer",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74461.json",
      "version": "1"
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If the hrtimer fires after i2c_imx-\u003eslave is set to\\nNULL, the timer callback i2c_imx_slave_finish_op() will call\\ni2c_imx_slave_event() with a NULL slave pointer, which results in a\\nuse-after-free / NULL pointer dereference.\\n\\nFix by canceling the hrtimer and waiting for it to complete after\\ndisabling interrupts, before clearing the slave pointer.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/i2c/busses/i2c-imx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f7414cd6923fd7f78e57086fc964ba2dc25db5c1\",\"lessThan\":\"e3da77bdb4015051656bb472c295656bbea03b6f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7414cd6923fd7f78e57086fc964ba2dc25db5c1\",\"lessThan\":\"470fe15fb3bb2eba6629be301ca7e991ee3cfb7e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7414cd6923fd7f78e57086fc964ba2dc25db5c1\",\"lessThan\":\"a8a1f9ac3d763e721586f15479ef9140b216ddf3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7414cd6923fd7f78e57086fc964ba2dc25db5c1\",\"lessThan\":\"753060f2b77ff2f386addbd3ecadb95b9f90cddd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7414cd6923fd7f78e57086fc964ba2dc25db5c1\",\"lessThan\":\"affd62f5719a78135b7441aa49c8cab3c3b5e838\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7414cd6923fd7f78e57086fc964ba2dc25db5c1\",\"lessThan\":\"dab4762ee7f3fd0a01980d5407ba48d0261d3bff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7414cd6923fd7f78e57086fc964ba2dc25db5c1\",\"lessThan\":\"6ac7702b6cc2b94aaed9ef2d95bfbefcdc90061f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/i2c/busses/i2c-imx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.11\",\"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:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/470fe15fb3bb2eba6629be301ca7e991ee3cfb7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ac7702b6cc2b94aaed9ef2d95bfbefcdc90061f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/753060f2b77ff2f386addbd3ecadb95b9f90cddd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a8a1f9ac3d763e721586f15479ef9140b216ddf3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/affd62f5719a78135b7441aa49c8cab3c3b5e838\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dab4762ee7f3fd0a01980d5407ba48d0261d3bff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e3da77bdb4015051656bb472c295656bbea03b6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:41:57+00:00",
      "cve": "CVE-2026-74461",
      "id": "CVE-2026-74461",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: i2c: imx: Cancel hrtimer before clearing slave pointer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74461.json",
      "version": "3"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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