{"id":"CVE-2021-47005","state":"PUBLISHED","title":"PCI: endpoint: Fix NULL pointer dereference for ->get_features()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: endpoint: Fix NULL pointer dereference for ->get_features()\n\nget_features ops of pci_epc_ops may return NULL, causing NULL pointer\ndereference in pci_epf_test_alloc_space function. Let us add a check for\npci_epc_feature pointer in pci_epf_test_bind before we access it to avoid\nany such NULL pointer dereference and return -ENOTSUPP in case\npci_epc_feature is not found.\n\nWhen the patch is not applied and EPC features is not implemented in the\nplatform driver, we see the following dump due to kernel NULL pointer\ndereference.\n\nCall trace:\n pci_epf_test_bind+0xf4/0x388\n pci_epf_bind+0x3c/0x80\n pci_epc_epf_link+0xa8/0xcc\n configfs_symlink+0x1a4/0x48c\n vfs_symlink+0x104/0x184\n do_symlinkat+0x80/0xd4\n __arm64_sys_symlinkat+0x1c/0x24\n el0_svc_common.constprop.3+0xb8/0x170\n el0_svc_handler+0x70/0x88\n el0_svc+0x8/0x640\nCode: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400)\n---[ end trace a438e3c5a24f9df0 ]---","publishedAt":"2024-02-28T08:13:25.933Z","updatedAt":"2026-05-11T13:46:06.962Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"bbed83d7060e07a5d309104d25a00f0a24441428","versionType":"git"},{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"679ebad058b8168f10e63876d63b0877fd2fe784","versionType":"git"},{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"0169d4f0bee44fdfef908c13ed21fcb326c38695","versionType":"git"},{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"6613bc2301ba291a1c5a90e1dc24cf3edf223c03","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/endpoint/functions/pci-epf-test.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.1","versionType":"semver"},{"version":"5.10.38","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.11.22","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.5","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/endpoint/functions/pci-epf-test.c"]}],"references":["https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428","https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784","https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695","https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47005.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47005","state":"PUBLISHED","datePublished":"2024-02-28T08:13:25.933Z","dateUpdated":"2026-05-11T13:46:06.962Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-02-27T18:42:55.952Z"},"containers":{"cna":{"title":"PCI: endpoint: Fix NULL pointer dereference for ->get_features()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI: endpoint: Fix NULL pointer dereference for ->get_features()\n\nget_features ops of pci_epc_ops may return NULL, causing NULL pointer\ndereference in pci_epf_test_alloc_space function. Let us add a check for\npci_epc_feature pointer in pci_epf_test_bind before we access it to avoid\nany such NULL pointer dereference and return -ENOTSUPP in case\npci_epc_feature is not found.\n\nWhen the patch is not applied and EPC features is not implemented in the\nplatform driver, we see the following dump due to kernel NULL pointer\ndereference.\n\nCall trace:\n pci_epf_test_bind+0xf4/0x388\n pci_epf_bind+0x3c/0x80\n pci_epc_epf_link+0xa8/0xcc\n configfs_symlink+0x1a4/0x48c\n vfs_symlink+0x104/0x184\n do_symlinkat+0x80/0xd4\n __arm64_sys_symlinkat+0x1c/0x24\n el0_svc_common.constprop.3+0xb8/0x170\n el0_svc_handler+0x70/0x88\n el0_svc+0x8/0x640\nCode: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400)\n---[ end trace a438e3c5a24f9df0 ]---"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"bbed83d7060e07a5d309104d25a00f0a24441428","versionType":"git"},{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"679ebad058b8168f10e63876d63b0877fd2fe784","versionType":"git"},{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"0169d4f0bee44fdfef908c13ed21fcb326c38695","versionType":"git"},{"version":"2c04c5b8eef797dca99699cfb55ff42dd3c12c23","status":"affected","lessThan":"6613bc2301ba291a1c5a90e1dc24cf3edf223c03","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/endpoint/functions/pci-epf-test.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.1","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.1","versionType":"semver"},{"version":"5.10.38","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.11.22","status":"unaffected","lessThanOrEqual":"5.11.*","versionType":"semver"},{"version":"5.12.5","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/endpoint/functions/pci-epf-test.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428"},{"url":"https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784"},{"url":"https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695"},{"url":"https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:46:06.962Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.10.38"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.11.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.12.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1","versionEndExcluding":"5.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2021-47005","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-02-28T19:13:34.596377Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-06-04T17:13:38.382Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:24:39.469Z"}}]}}}