{"id":"CVE-2023-53363","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-53363","generatedAt":"2026-10-28T02:14:57.600Z","title":"In the Linux kernel, the following vulnerability has been resolved: PCI: Fix use-after-free in pci_bus_release_domain_nr() Commit c14f7ccc9f5d (\"PCI: Assign PCI domain IDs by ida_alloc()\") introduced a use-after-free bug in the bus removal cleanup.","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Fix use-after-free in pci_bus_release_domain_nr()\n\nCommit c14f7ccc9f5d (\"PCI: Assign PCI domain IDs by ida_alloc()\")\nintroduced a use-after-free bug in the bus removal cleanup. The issue was\nfound with kfence:\n\n  [   19.293351] BUG: KFENCE: use-after-free read in pci_bus_release_domain_nr+0x10/0x70\n\n  [   19.302817] Use-after-free read at 0x000000007f3b80eb (in kfence-#115):\n  [   19.309677]  pci_bus_release_domain_nr+0x10/0x70\n  [   19.309691]  dw_pcie_host_deinit+0x28/0x78\n  [   19.309702]  tegra_pcie_deinit_controller+0x1c/0x38 [pcie_tegra194]\n  [   19.309734]  tegra_pcie_dw_probe+0x648/0xb28 [pcie_tegra194]\n  [   19.309752]  platform_probe+0x90/0xd8\n  ...\n\n  [   19.311457] kfence-#115: 0x00000000063a155a-0x00000000ba698da8, size=1072, cache=kmalloc-2k\n\n  [   19.311469] allocated by task 96 on cpu 10 at 19.279323s:\n  [   19.311562]  __kmem_cache_alloc_node+0x260/0x278\n  [   19.311571]  kmalloc_trace+0x24/0x30\n  [   19.311580]  pci_alloc_bus+0x24/0xa0\n  [   19.311590]  pci_register_host_bridge+0x48/0x4b8\n  [   19.311601]  pci_scan_root_bus_bridge+0xc0/0xe8\n  [   19.311613]  pci_host_probe+0x18/0xc0\n  [   19.311623]  dw_pcie_host_init+0x2c0/0x568\n  [   19.311630]  tegra_pcie_dw_probe+0x610/0xb28 [pcie_tegra194]\n  [   19.311647]  platform_probe+0x90/0xd8\n  ...\n\n  [   19.311782] freed by task 96 on cpu 10 at 19.285833s:\n  [   19.311799]  release_pcibus_dev+0x30/0x40\n  [   19.311808]  device_release+0x30/0x90\n  [   19.311814]  kobject_put+0xa8/0x120\n  [   19.311832]  device_unregister+0x20/0x30\n  [   19.311839]  pci_remove_bus+0x78/0x88\n  [   19.311850]  pci_remove_root_bus+0x5c/0x98\n  [   19.311860]  dw_pcie_host_deinit+0x28/0x78\n  [   19.311866]  tegra_pcie_deinit_controller+0x1c/0x38 [pcie_tegra194]\n  [   19.311883]  tegra_pcie_dw_probe+0x648/0xb28 [pcie_tegra194]\n  [   19.311900]  platform_probe+0x90/0xd8\n  ...\n\n  [   19.313579] CPU: 10 PID: 96 Comm: kworker/u24:2 Not tainted 6.2.0 #4\n  [   19.320171] Hardware name:  /, BIOS 1.0-d7fb19b 08/10/2022\n  [   19.325852] Workqueue: events_unbound deferred_probe_work_func\n\nThe stack trace is a bit misleading as dw_pcie_host_deinit() doesn't\ndirectly call pci_bus_release_domain_nr(). The issue turns out to be in\npci_remove_root_bus() which first calls pci_remove_bus() which frees the\nstruct pci_bus when its struct device is released. Then\npci_bus_release_domain_nr() is called and accesses the freed struct\npci_bus. Reordering these fixes the issue.","published":"2025-09-17T15:15:41.000Z","lastModified":"2026-06-17T06:45:01.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-416"],"affected":["linux/linux kernel"],"epss":{"score":0.00193,"percentile":0.0885,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/07a75c0050e59c50f038cc5f4e2a3258c8f8c9d0","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/30ba2d09edb5ea857a1473ae3d820911347ada62","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/52b0343c7d628f37b38e3279ba585526b850ad3b","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ad367516b1c09317111255ecfbf5e42c33e31918","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fbf45385e3419b8698b5e0a434847072375cfec2","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-53363","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}