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CVE-2024-44951 (GCVE-0-2024-44951)

Vulnerability from cvelistv5 – Published: 2024-09-04 18:35 – Updated: 2026-08-05 11:37
VLAI
Title
serial: sc16is7xx: fix TX fifo corruption
Summary
In the Linux kernel, the following vulnerability has been resolved: serial: sc16is7xx: fix TX fifo corruption Sometimes, when a packet is received on channel A at almost the same time as a packet is about to be transmitted on channel B, we observe with a logic analyzer that the received packet on channel A is transmitted on channel B. In other words, the Tx buffer data on channel B is corrupted with data from channel A. The problem appeared since commit 4409df5866b7 ("serial: sc16is7xx: change EFR lock to operate on each channels"), which changed the EFR locking to operate on each channel instead of chip-wise. This commit has introduced a regression, because the EFR lock is used not only to protect the EFR registers access, but also, in a very obscure and undocumented way, to protect access to the data buffer, which is shared by the Tx and Rx handlers, but also by each channel of the IC. Fix this regression first by switching to kfifo_out_linear_ptr() in sc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer. Secondly, replace the chip-wise Rx buffer with a separate Rx buffer for each channel.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:40 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4409df5866b7ff7686ba27e449ca97a92ee063c9 , < 09cfe05e9907f3276887a20e267cc40e202f4fdd (git)
Affected: 4409df5866b7ff7686ba27e449ca97a92ee063c9 , < 133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4 (git)
Affected: 4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68 (git)
Affected: 9879e1bec3c0f077427dd0d258c80c63ce9babdf (git)
Affected: dbe196ca489f3833e0f9eeb86ac346194f131c91 (git)
Affected: 6.1.76 , < 6.2 (semver)
Affected: 6.6.15 , < 6.7 (semver)
Affected: 6.7.3 , < 6.8 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.10.5 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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              "value": "AV:L - Both sides of the race are driven purely from local userspace \u2014 `write(2)` on one `/dev/ttySC*` node queues `tx_work` into the chip kworker while `read(2)`/incoming traffic on the sibling channel runs the threaded-IRQ RX handler. No network path exists, but no physical access is needed either, since the corrupting write and the observable leak both occur through tty device nodes.\nAC:L - The unprotected window spans an entire SPI/I\u00b2C bus transfer of up to 64 bytes, and the attacker can keep one channel transmitting continuously to re-arm the race indefinitely at no cost. The upstream report confirms the corruption occurs spontaneously under normal dual-channel traffic, so no condition beyond the attacker\u0027s control is required.\nPR:L - The attacker needs only open/read/write access to one of the chip\u0027s tty nodes, which on the embedded, industrial and automotive systems using SC16IS75x/76x bridges is granted to ordinary users via the dialout group or service accounts. No CAP_SYS_ADMIN or root is required anywhere on the path.\nUI:N - The race is triggered by the attacker\u0027s own writes racing against ambient traffic on the sibling channel; no victim action is needed. The victim process is affected simply by using its own serial port normally.\nS:U - The vulnerable driver and all impacted resources (the tty ports it manages) are within the same kernel security authority. No VM, IOMMU or sandbox boundary is crossed.\nC:H - The race copies one channel\u0027s data into the other\u0027s stream in both directions \u2014 channel A\u0027s received bytes are emitted on channel B\u0027s physical wire, and channel B\u0027s transmit payload appears in channel A\u0027s tty read buffer where a different, lower-privileged user can read it. Because the attacker can sustain the race by flooding its own channel, a large fraction of the victim channel\u0027s traffic (console output, credentials, modem/AT sequences, metering or control data) can be harvested over time.\nI:H - Attacker-supplied bytes written to one tty are injected into the other channel\u0027s receive stream and are consumed by the victim as legitimate serial input \u2014 including passing through `uart_handle_sysrq_char()` on a console channel \u2014 while the victim\u0027s intended TX payload is silently replaced with foreign data on the wire. This is unauthenticated modification of another security context\u0027s data stream and of the commands actually delivered to attached hardware.\nA:H - Data taken from `xmit_fifo` by `uart_fifo_out()` is destroyed when overwritten, so the victim channel\u0027s traffic is permanently lost, and the attacker can sustain this by keeping its own channel busy. For the RS-485 control buses, modem links and serial consoles these bridge chips serve, continuous corruption renders the link unusable \u2014 a total loss of that communication resource."
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In other words, the Tx buffer data on channel B is corrupted\\nwith data from channel A.\\n\\nThe problem appeared since commit 4409df5866b7 (\\\"serial: sc16is7xx: change\\nEFR lock to operate on each channels\\\"), which changed the EFR locking to\\noperate on each channel instead of chip-wise.\\n\\nThis commit has introduced a regression, because the EFR lock is used not\\nonly to protect the EFR registers access, but also, in a very obscure and\\nundocumented way, to protect access to the data buffer, which is shared by\\nthe Tx and Rx handlers, but also by each channel of the IC.\\n\\nFix this regression first by switching to kfifo_out_linear_ptr() in\\nsc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer.\\n\\nSecondly, replace the chip-wise Rx buffer with a separate Rx buffer for\\neach channel.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: serial: sc16is7xx: fix TX fifo democracy A veces, cuando se recibe un paquete en el canal A casi al mismo tiempo que se va a transmitir un paquete en el canal B, observamos con un analizador l\u00f3gico que el paquete recibido en el canal A se transmite en el canal B. 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    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-44951\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T17:40:19.986023Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:27.672Z\"}}], \"cna\": {\"title\": \"serial: sc16is7xx: fix TX fifo corruption\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4409df5866b7ff7686ba27e449ca97a92ee063c9\", \"lessThan\": \"09cfe05e9907f3276887a20e267cc40e202f4fdd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4409df5866b7ff7686ba27e449ca97a92ee063c9\", \"lessThan\": \"133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9879e1bec3c0f077427dd0d258c80c63ce9babdf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"dbe196ca489f3833e0f9eeb86ac346194f131c91\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6.1.76\", \"lessThan\": \"6.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.15\", \"lessThan\": \"6.7\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.7.3\", \"lessThan\": \"6.8\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/tty/serial/sc16is7xx.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.10.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/serial/sc16is7xx.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/09cfe05e9907f3276887a20e267cc40e202f4fdd\"}, {\"url\": \"https://git.kernel.org/stable/c/133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nserial: sc16is7xx: fix TX fifo corruption\\n\\nSometimes, when a packet is received on channel A at almost the same time\\nas a packet is about to be transmitted on channel B, we observe with a\\nlogic analyzer that the received packet on channel A is transmitted on\\nchannel B. In other words, the Tx buffer data on channel B is corrupted\\nwith data from channel A.\\n\\nThe problem appeared since commit 4409df5866b7 (\\\"serial: sc16is7xx: change\\nEFR lock to operate on each channels\\\"), which changed the EFR locking to\\noperate on each channel instead of chip-wise.\\n\\nThis commit has introduced a regression, because the EFR lock is used not\\nonly to protect the EFR registers access, but also, in a very obscure and\\nundocumented way, to protect access to the data buffer, which is shared by\\nthe Tx and Rx handlers, but also by each channel of the IC.\\n\\nFix this regression first by switching to kfifo_out_linear_ptr() in\\nsc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer.\\n\\nSecondly, replace the chip-wise Rx buffer with a separate Rx buffer for\\neach channel.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.5\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"6.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.1.76\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.6.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.7.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-23T15:53:12.452Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-44951\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:53:12.452Z\", \"dateReserved\": \"2024-08-21T05:34:56.665Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-04T18:35:51.366Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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

Author Source Type Date Other

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.