{"id":"CVE-2021-47333","state":"PUBLISHED","title":"misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: alcor_pci: fix null-ptr-deref when there is no PCI bridge\n\nThere is an issue with the ASPM(optional) capability checking function.\nA device might be attached to root complex directly, in this case,\nbus->self(bridge) will be NULL, thus priv->parent_pdev is NULL.\nSince alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's\nASPM capability and populate parent_cap_off, which will be used later by\nalcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do\nhere is to avoid checking the capability if we are on the root complex.\nThis will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply\nreturn when bring called, effectively disable ASPM for the device.\n\n[    1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0\n[    1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40\n[    1.253998] Call Trace:\n[    1.254131]  ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci]\n[    1.254476]  alcor_pci_probe+0x169/0x2d5 [alcor_pci]","publishedAt":"2024-05-21T14:35:43.760Z","updatedAt":"2026-05-11T13:52:36.036Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"d2639ffdcad463b358b6bef8645ff81715daffcb","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"58f69684ba03e5b0e0a3ae844a845280c0f06309","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"717cf5ae52322ddbdf3ac2c584b34c5970b0d174","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"09d154990ca82d14aed2b72796f6c8845e2e605d","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"3ce3e45cc333da707d4d6eb433574b990bcc26f5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/cardreader/alcor_pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"5.4.134","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.52","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.19","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13.4","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/cardreader/alcor_pci.c"]}],"references":["https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb","https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309","https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174","https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d","https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47333.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47333","state":"PUBLISHED","datePublished":"2024-05-21T14:35:43.760Z","dateUpdated":"2026-05-11T13:52:36.036Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-05-21T14:28:16.975Z"},"containers":{"cna":{"title":"misc: alcor_pci: fix null-ptr-deref when there is no PCI bridge","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: alcor_pci: fix null-ptr-deref when there is no PCI bridge\n\nThere is an issue with the ASPM(optional) capability checking function.\nA device might be attached to root complex directly, in this case,\nbus->self(bridge) will be NULL, thus priv->parent_pdev is NULL.\nSince alcor_pci_init_check_aspm(priv->parent_pdev) checks the PCI link's\nASPM capability and populate parent_cap_off, which will be used later by\nalcor_pci_aspm_ctrl() to dynamically turn on/off device, what we can do\nhere is to avoid checking the capability if we are on the root complex.\nThis will make pdev_cap_off 0 and alcor_pci_aspm_ctrl() will simply\nreturn when bring called, effectively disable ASPM for the device.\n\n[    1.246492] BUG: kernel NULL pointer dereference, address: 00000000000000c0\n[    1.248731] RIP: 0010:pci_read_config_byte+0x5/0x40\n[    1.253998] Call Trace:\n[    1.254131]  ? alcor_pci_find_cap_offset.isra.0+0x3a/0x100 [alcor_pci]\n[    1.254476]  alcor_pci_probe+0x169/0x2d5 [alcor_pci]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"d2639ffdcad463b358b6bef8645ff81715daffcb","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"58f69684ba03e5b0e0a3ae844a845280c0f06309","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"717cf5ae52322ddbdf3ac2c584b34c5970b0d174","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"09d154990ca82d14aed2b72796f6c8845e2e605d","versionType":"git"},{"version":"4f556bc04e3c0de2f5c69adc9e9f2bcefcad079d","status":"affected","lessThan":"3ce3e45cc333da707d4d6eb433574b990bcc26f5","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/cardreader/alcor_pci.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"5.4.134","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.52","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.12.19","status":"unaffected","lessThanOrEqual":"5.12.*","versionType":"semver"},{"version":"5.13.4","status":"unaffected","lessThanOrEqual":"5.13.*","versionType":"semver"},{"version":"5.14","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/misc/cardreader/alcor_pci.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb"},{"url":"https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309"},{"url":"https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174"},{"url":"https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d"},{"url":"https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:52:36.036Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.4.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.10.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.12.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.13.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.14"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2024-05-29T18:10:17.261528Z","id":"CVE-2021-47333","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","description":"CWE-noinfo Not enough information"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-31T15:28:29.646Z"}},{"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/d2639ffdcad463b358b6bef8645ff81715daffcb","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/58f69684ba03e5b0e0a3ae844a845280c0f06309","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/717cf5ae52322ddbdf3ac2c584b34c5970b0d174","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/09d154990ca82d14aed2b72796f6c8845e2e605d","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/3ce3e45cc333da707d4d6eb433574b990bcc26f5","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-04T05:32:08.457Z"}}]}}}