CVE ID :CVE-2026-64205<\/p>\n
Published : July 20, 2026, 5:18 p.m. | 25\u00a0minutes ago<\/p>\n
Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
i2c: i801: fix hardware state machine corruption in error path<\/p>\n
A severe livelock and subsequent Hung Task panic were observed in the
\ni2c-i801 driver during concurrent Fuzzing. The crash is caused by an
\nunconditional hardware register cleanup in the error handling path of
\ni801_access().<\/p>\n
When i801_check_pre() fails (e.g., returning -EBUSY because the SMBus
\ncontroller is actively used by BIOS\/ACPI), the kernel does not actually
\nacquire the hardware ownership. However, the code jumps to the ‘out’
\nlabel and executes:<\/p>\n
iowrite8(SMBHSTSTS_INUSE_STS | STATUS_FLAGS, SMBHSTSTS(priv));<\/p>\n
This forcefully clears the INUSE_STS lock and resets the hardware status
\nflags without owning the controller. Doing so interrupts ongoing BIOS\/ACPI
\ntransactions and totally corrupts the SMBus hardware state machine.<\/p>\n
Consequently, all subsequent i801_access() calls fail at the pre-check
\nstage, triggering an endless stream of “SMBus is busy, can’t use it!”
\nerror logs. Over a slow serial console, this printk flood monopolizes
\nthe CPU (Console Livelock), starving other processes trying to acquire
\nthe mmap_lock down_read semaphore, ultimately triggering the hung task
\nwatchdog.<\/p>\n
Fix this by moving the ‘out’ label below the hardware register cleanup.
\nIf i801_check_pre() fails, we safely bypass the iowrite8() and only
\nrelease the software locks (pm_runtime and mutex), strictly adhering to
\nthe rule of not releasing resources that were never acquired.<\/p>\n
Severity: 0.0 | NA<\/p>\n
Visit the link for more details, such as CVSS details, affected products, timeline, and more…\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
CVE ID :CVE-2026-64205 Published : July 20, 2026, 5:18 p.m. | 25\u00a0minutes ago Description :In the Linux kernel, the following vulnerability has been resolved: i2c: i801: fix hardware state machine corruption in error path A severe livelock and subsequent Hung Task panic were observed in the i2c-i801 driver during concurrent Fuzzing. The crash is caused …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82297","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82297"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82297\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}