{"id":"DEBIAN-CVE-2021-47617","details":"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.","modified":"2026-09-15T09:02:32.220050060Z","published":"2024-06-20T11:15:54.317Z","upstream":["CVE-2021-47617"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2021-47617"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47617.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47617.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2021-47617.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}