CVE-2021-47617 (GCVE-0-2021-47617)

Vulnerability from cvelistv5 – Published: 2024-06-20 10:57 – Updated: 2025-05-04 07:15
VLAI?
Title
PCI: pciehp: Fix infinite loop in IRQ handler upon power fault
Summary
In the Linux kernel, the following vulnerability has been resolved: PCI: pciehp: Fix infinite loop in IRQ handler upon power fault The Power Fault Detected bit in the Slot Status register differs from all other hotplug events in that it is sticky: It can only be cleared after turning off slot power. Per PCIe r5.0, sec. 6.7.1.8: If a power controller detects a main power fault on the hot-plug slot, it must automatically set its internal main power fault latch [...]. The main power fault latch is cleared when software turns off power to the hot-plug slot. The stickiness used to cause interrupt storms and infinite loops which were fixed in 2009 by commits 5651c48cfafe ("PCI pciehp: fix power fault interrupt storm problem") and 99f0169c17f3 ("PCI: pciehp: enable software notification on empty slots"). Unfortunately in 2020 the infinite loop issue was inadvertently reintroduced by commit 8edf5332c393 ("PCI: pciehp: Fix MSI interrupt race"): The hardirq handler pciehp_isr() clears the PFD bit until pciehp's power_fault_detected flag is set. That happens in the IRQ thread pciehp_ist(), which never learns of the event because the hardirq handler is stuck in an infinite loop. Fix by setting the power_fault_detected flag already in the hardirq handler.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a8cc52270f3d8e8f4faf01ffd6c4a95bbfb55ba4 , < ff27f7d0333cff89ec85c419f431aca1b38fb16a (git)
Affected: 4667358dab9cc07da044d5bc087065545b1000df , < 464da38ba827f670deac6500a1de9a4f0f44c41d (git)
Affected: 8edf5332c39340b9583cf9cba659eb7ec71f75b5 , < 3b4c966fb156ff3e70b2526d964952ff7c1574d9 (git)
Affected: 8edf5332c39340b9583cf9cba659eb7ec71f75b5 , < 1db58c6584a72102e98af2e600ea184ddaf2b8af (git)
Affected: 8edf5332c39340b9583cf9cba659eb7ec71f75b5 , < 6d6f1f0dac3e3441ecdb1103d4efb11b9ed24dd5 (git)
Affected: 8edf5332c39340b9583cf9cba659eb7ec71f75b5 , < 23584c1ed3e15a6f4bfab8dc5a88d94ab929ee12 (git)
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    Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 4.19.233 , ≤ 4.19.* (semver)
Unaffected: 5.4.177 , ≤ 5.4.* (semver)
Unaffected: 5.10.97 , ≤ 5.10.* (semver)
Unaffected: 5.15.20 , ≤ 5.15.* (semver)
Unaffected: 5.16.6 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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