CVE-2026-63902 (GCVE-0-2026-63902)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-19 14:55
VLAI
Title
USB: serial: cypress_m8: validate interrupt packet headers
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: validate interrupt packet headers cypress_read_int_callback() parses the interrupt-in buffer according to the selected Cypress packet format. Format 1 has a two-byte status/count header and format 2 has a one-byte combined status/count header. The usb-serial core sizes the interrupt-in buffer from the endpoint descriptor's wMaxPacketSize, and successful interrupt transfers can complete short when URB_SHORT_NOT_OK is not set. Check that the completed packet contains the selected header before reading it. Malformed short reports are ignored and the interrupt URB is resubmitted through the existing retry path, preventing out-of-bounds header-byte reads. KASAN report as below: KASAN slab-out-of-bounds in cypress_read_int_callback+0x240/0x7f0 Read of size 1 Call trace: cypress_read_int_callback() (drivers/usb/serial/cypress_m8.c:1009) __usb_hcd_giveback_urb() dummy_timer() [ johan: use constants in header length sanity checks ]
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < fcef31a5a85ccf3c313449a866ec6ed7e4132425 (git)
Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < aaa66708bfb1dca2acd219d1c1582f9f6d5492cb (git)
Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed (git)
Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < be50533fe7068e86eb7adb81988e6d6a3f6dfe53 (git)
Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 90664556916de22467097d4c8ceb716d597a5c32 (git)
Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < ae03453f2c809ca3cf73753269fa6184dea7160f (git)
Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 4a4cb0021ebe1fcadb52e04d19ed8d71470a530b (git)
Affected: 3416eaa1f8f8d516b77de514e14cf8da256d28fb , < 9f9bfc80c67f35a275820da7e83a35dface08281 (git)
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Linux Linux Affected: 2.6.26
Unaffected: 0 , < 2.6.26 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "datePublished": "2026-07-19T14:55:10.267Z",
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    "dateUpdated": "2026-07-19T14:55:10.267Z",
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Malformed short reports are ignored and the interrupt URB is\\nresubmitted through the existing retry path, preventing out-of-bounds\\nheader-byte reads.\\n\\nKASAN report as below:\\nKASAN slab-out-of-bounds in cypress_read_int_callback+0x240/0x7f0\\nRead of size 1\\nCall trace:\\n  cypress_read_int_callback() (drivers/usb/serial/cypress_m8.c:1009)\\n  __usb_hcd_giveback_urb()\\n  dummy_timer()\\n\\n[ johan: use constants in header length sanity checks ]\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/serial/cypress_m8.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"fcef31a5a85ccf3c313449a866ec6ed7e4132425\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"aaa66708bfb1dca2acd219d1c1582f9f6d5492cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"be50533fe7068e86eb7adb81988e6d6a3f6dfe53\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"90664556916de22467097d4c8ceb716d597a5c32\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"ae03453f2c809ca3cf73753269fa6184dea7160f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"4a4cb0021ebe1fcadb52e04d19ed8d71470a530b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3416eaa1f8f8d516b77de514e14cf8da256d28fb\",\"lessThan\":\"9f9bfc80c67f35a275820da7e83a35dface08281\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/serial/cypress_m8.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.26\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.26\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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.