{"id":"CVE-2022-49434","state":"PUBLISHED","title":"PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()\n\nThe sysfs sriov_numvfs_store() path acquires the device lock before the\nconfig space access lock:\n\n  sriov_numvfs_store\n    device_lock                 # A (1) acquire device lock\n    sriov_configure\n      vfio_pci_sriov_configure  # (for example)\n        vfio_pci_core_sriov_configure\n          pci_disable_sriov\n            sriov_disable\n              pci_cfg_access_lock\n                pci_wait_cfg    # B (4) wait for dev->block_cfg_access == 0\n\nPreviously, pci_dev_lock() acquired the config space access lock before the\ndevice lock:\n\n  pci_dev_lock\n    pci_cfg_access_lock\n      dev->block_cfg_access = 1 # B (2) set dev->block_cfg_access = 1\n    device_lock                 # A (3) wait for device lock\n\nAny path that uses pci_dev_lock(), e.g., pci_reset_function(), may\ndeadlock with sriov_numvfs_store() if the operations occur in the sequence\n(1) (2) (3) (4).\n\nAvoid the deadlock by reversing the order in pci_dev_lock() so it acquires\nthe device lock before the config space access lock, the same as the\nsriov_numvfs_store() path.\n\n[bhelgaas: combined and adapted commit log from Jay Zhou's independent\nsubsequent posting:\nhttps://lore.kernel.org/r/20220404062539.1710-1-jianjay.zhou@huawei.com]","publishedAt":"2025-02-26T02:12:51.068Z","updatedAt":"2026-05-11T18:59:44.724Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"aed6d4d519210c28817948f34c53b6e058e0456c","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"c9a81f9ed6ae3554621d6a50220b1bc74b67d81e","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"eff3587b9c01439b738298475e555c028ac9f55e","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"2cdd5284035322795b0964f899eefba254cfe483","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"ea047f51172aa68841adef7f52d375002438b8f0","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"59ea6b3ae51df7cd6bfd84c9c0030609b9315622","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"a91ee0e9fca9d7501286cfbced9b30a33e52740a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.13","versionType":"semver"},{"version":"4.14.283","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.247","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.198","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.121","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.46","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.14","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.3","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pci.c"]}],"references":["https://git.kernel.org/stable/c/c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831","https://git.kernel.org/stable/c/aed6d4d519210c28817948f34c53b6e058e0456c","https://git.kernel.org/stable/c/c9a81f9ed6ae3554621d6a50220b1bc74b67d81e","https://git.kernel.org/stable/c/eff3587b9c01439b738298475e555c028ac9f55e","https://git.kernel.org/stable/c/2cdd5284035322795b0964f899eefba254cfe483","https://git.kernel.org/stable/c/ea047f51172aa68841adef7f52d375002438b8f0","https://git.kernel.org/stable/c/59ea6b3ae51df7cd6bfd84c9c0030609b9315622","https://git.kernel.org/stable/c/a91ee0e9fca9d7501286cfbced9b30a33e52740a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49434.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49434","state":"PUBLISHED","datePublished":"2025-02-26T02:12:51.068Z","dateUpdated":"2026-05-11T18:59:44.724Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T02:08:31.570Z"},"containers":{"cna":{"title":"PCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: Avoid pci_dev_lock() AB/BA deadlock with sriov_numvfs_store()\n\nThe sysfs sriov_numvfs_store() path acquires the device lock before the\nconfig space access lock:\n\n  sriov_numvfs_store\n    device_lock                 # A (1) acquire device lock\n    sriov_configure\n      vfio_pci_sriov_configure  # (for example)\n        vfio_pci_core_sriov_configure\n          pci_disable_sriov\n            sriov_disable\n              pci_cfg_access_lock\n                pci_wait_cfg    # B (4) wait for dev->block_cfg_access == 0\n\nPreviously, pci_dev_lock() acquired the config space access lock before the\ndevice lock:\n\n  pci_dev_lock\n    pci_cfg_access_lock\n      dev->block_cfg_access = 1 # B (2) set dev->block_cfg_access = 1\n    device_lock                 # A (3) wait for device lock\n\nAny path that uses pci_dev_lock(), e.g., pci_reset_function(), may\ndeadlock with sriov_numvfs_store() if the operations occur in the sequence\n(1) (2) (3) (4).\n\nAvoid the deadlock by reversing the order in pci_dev_lock() so it acquires\nthe device lock before the config space access lock, the same as the\nsriov_numvfs_store() path.\n\n[bhelgaas: combined and adapted commit log from Jay Zhou's independent\nsubsequent posting:\nhttps://lore.kernel.org/r/20220404062539.1710-1-jianjay.zhou@huawei.com]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"aed6d4d519210c28817948f34c53b6e058e0456c","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"c9a81f9ed6ae3554621d6a50220b1bc74b67d81e","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"eff3587b9c01439b738298475e555c028ac9f55e","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"2cdd5284035322795b0964f899eefba254cfe483","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"ea047f51172aa68841adef7f52d375002438b8f0","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"59ea6b3ae51df7cd6bfd84c9c0030609b9315622","versionType":"git"},{"version":"17530e71e0166a37f8e20a9b7bcf1d50ae3cff8e","status":"affected","lessThan":"a91ee0e9fca9d7501286cfbced9b30a33e52740a","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.13","versionType":"semver"},{"version":"4.14.283","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.247","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.198","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.121","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.46","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.17.14","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.3","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pci.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c3c6dc1853b8bf3c718f96fd8480a6eb09ba4831"},{"url":"https://git.kernel.org/stable/c/aed6d4d519210c28817948f34c53b6e058e0456c"},{"url":"https://git.kernel.org/stable/c/c9a81f9ed6ae3554621d6a50220b1bc74b67d81e"},{"url":"https://git.kernel.org/stable/c/eff3587b9c01439b738298475e555c028ac9f55e"},{"url":"https://git.kernel.org/stable/c/2cdd5284035322795b0964f899eefba254cfe483"},{"url":"https://git.kernel.org/stable/c/ea047f51172aa68841adef7f52d375002438b8f0"},{"url":"https://git.kernel.org/stable/c/59ea6b3ae51df7cd6bfd84c9c0030609b9315622"},{"url":"https://git.kernel.org/stable/c/a91ee0e9fca9d7501286cfbced9b30a33e52740a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T18:59:44.724Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"4.14.283"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"4.19.247"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.4.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.10.121"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.15.46"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.17.14"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.13","versionEndExcluding":"5.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}