CVE-2026-64528 (GCVE-0-2026-64528)
Vulnerability from cvelistv5 – Published: 2026-07-25 09:20 – Updated: 2026-07-25 09:20
VLAI
EPSS
VEX
Title
tty: serial: samsung: Remove redundant port lock acquisition in rx helpers
Summary
In the Linux kernel, the following vulnerability has been resolved:
tty: serial: samsung: Remove redundant port lock acquisition in rx helpers
Sashiko identified a deadlock when the console flow is engaged [1].
When console flow control is enabled (UPF_CONS_FLOW),
s3c24xx_serial_stop_tx() calls s3c24xx_serial_rx_enable() and
s3c24xx_serial_start_tx() calls s3c24xx_serial_rx_disable().
The serial core framework invokes the .stop_tx() and .start_tx()
callbacks with the port->lock spinlock already held. Furthermore, all
internal driver paths that invoke stop_tx (such as the DMA TX
completion handler s3c24xx_serial_tx_dma_complete() or the PIO TX IRQ
handler s3c24xx_serial_tx_irq()) also acquire port->lock prior to
calling it. (Note that s3c24xx_serial_start_tx() is only invoked by the
serial core).
However, s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable()
unconditionally attempt to acquire port->lock again using
uart_port_lock_irqsave(). Since spinlocks are not recursive, this
causes a deadlock on the same CPU when console flow control is engaged.
Remove the redundant lock acquisition from both rx helper functions.
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
b497549a035c2a81b71c7a27f2b00c8a16c09423 , < ee9eb72be95490602c493db050c73d925c3a4d74
(git)
Affected: b497549a035c2a81b71c7a27f2b00c8a16c09423 , < 10014eb7eee351f7b587f8ac85830f0c9343cb9a (git) Affected: b497549a035c2a81b71c7a27f2b00c8a16c09423 , < f4c3e63fa8639aedf96fb200d9939945a9eed51e (git) Affected: b497549a035c2a81b71c7a27f2b00c8a16c09423 , < a9c22e0f93ba18322a6623ecdda2f0cd858ca350 (git) Affected: b497549a035c2a81b71c7a27f2b00c8a16c09423 , < 14143ec10d69f42806b5d7b046f0fd1b835831ae (git) Affected: b497549a035c2a81b71c7a27f2b00c8a16c09423 , < 9fd48937046efc9abb89379d63ee9cc5c661d711 (git) Affected: b497549a035c2a81b71c7a27f2b00c8a16c09423 , < 9c92b42207978559e32903c3098aaf5c5b5788b2 (git) Affected: b497549a035c2a81b71c7a27f2b00c8a16c09423 , < a3bb136bff5e6a5e48cdd813246c9c4686feaaa9 (git) |
|
| Linux | Linux |
Affected:
2.6.27
Unaffected: 0 , < 2.6.27 (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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"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver"
},
{
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"version": "6.6.143",
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"cpeApplicability": [
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: serial: samsung: Remove redundant port lock acquisition in rx helpers\n\nSashiko identified a deadlock when the console flow is engaged [1].\n\nWhen console flow control is enabled (UPF_CONS_FLOW),\ns3c24xx_serial_stop_tx() calls s3c24xx_serial_rx_enable() and\ns3c24xx_serial_start_tx() calls s3c24xx_serial_rx_disable().\n\nThe serial core framework invokes the .stop_tx() and .start_tx()\ncallbacks with the port-\u003elock spinlock already held. Furthermore, all\ninternal driver paths that invoke stop_tx (such as the DMA TX\ncompletion handler s3c24xx_serial_tx_dma_complete() or the PIO TX IRQ\nhandler s3c24xx_serial_tx_irq()) also acquire port-\u003elock prior to\ncalling it. (Note that s3c24xx_serial_start_tx() is only invoked by the\nserial core).\n\nHowever, s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable()\nunconditionally attempt to acquire port-\u003elock again using\nuart_port_lock_irqsave(). Since spinlocks are not recursive, this\ncauses a deadlock on the same CPU when console flow control is engaged.\n\nRemove the redundant lock acquisition from both rx helper functions."
}
],
"providerMetadata": {
"dateUpdated": "2026-07-25T09:20:51.774Z",
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"url": "https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e"
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"url": "https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350"
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"url": "https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae"
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"url": "https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711"
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"url": "https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9"
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"title": "tty: serial: samsung: Remove redundant port lock acquisition in rx helpers",
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"cveId": "CVE-2026-64528",
"datePublished": "2026-07-25T09:20:51.774Z",
"dateReserved": "2026-07-19T15:36:31.794Z",
"dateUpdated": "2026-07-25T09:20:51.774Z",
"state": "PUBLISHED"
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"date": "2026-07-25",
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Furthermore, all\\ninternal driver paths that invoke stop_tx (such as the DMA TX\\ncompletion handler s3c24xx_serial_tx_dma_complete() or the PIO TX IRQ\\nhandler s3c24xx_serial_tx_irq()) also acquire port-\u003elock prior to\\ncalling it. (Note that s3c24xx_serial_start_tx() is only invoked by the\\nserial core).\\n\\nHowever, s3c24xx_serial_rx_enable() and s3c24xx_serial_rx_disable()\\nunconditionally attempt to acquire port-\u003elock again using\\nuart_port_lock_irqsave(). Since spinlocks are not recursive, this\\ncauses a deadlock on the same CPU when console flow control is engaged.\\n\\nRemove the redundant lock acquisition from both rx helper functions.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/tty/serial/samsung_tty.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"ee9eb72be95490602c493db050c73d925c3a4d74\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"10014eb7eee351f7b587f8ac85830f0c9343cb9a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"f4c3e63fa8639aedf96fb200d9939945a9eed51e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"a9c22e0f93ba18322a6623ecdda2f0cd858ca350\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"14143ec10d69f42806b5d7b046f0fd1b835831ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"9fd48937046efc9abb89379d63ee9cc5c661d711\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"9c92b42207978559e32903c3098aaf5c5b5788b2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b497549a035c2a81b71c7a27f2b00c8a16c09423\",\"lessThan\":\"a3bb136bff5e6a5e48cdd813246c9c4686feaaa9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/tty/serial/samsung_tty.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.27\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.27\",\"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/10014eb7eee351f7b587f8ac85830f0c9343cb9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/14143ec10d69f42806b5d7b046f0fd1b835831ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9c92b42207978559e32903c3098aaf5c5b5788b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9fd48937046efc9abb89379d63ee9cc5c661d711\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a3bb136bff5e6a5e48cdd813246c9c4686feaaa9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a9c22e0f93ba18322a6623ecdda2f0cd858ca350\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee9eb72be95490602c493db050c73d925c3a4d74\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f4c3e63fa8639aedf96fb200d9939945a9eed51e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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