{"id":"CVE-2025-40034","state":"PUBLISHED","title":"PCI/AER: Avoid NULL pointer dereference in aer_ratelimit()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/AER: Avoid NULL pointer dereference in aer_ratelimit()\n\nWhen platform firmware supplies error information to the OS, e.g., via the\nACPI APEI GHES mechanism, it may identify an error source device that\ndoesn't advertise an AER Capability and therefore dev->aer_info, which\ncontains AER stats and ratelimiting data, is NULL.\n\npci_dev_aer_stats_incr() already checks dev->aer_info for NULL, but\naer_ratelimit() did not, leading to NULL pointer dereferences like this one\nfrom the URL below:\n\n  {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 0\n  {1}[Hardware Error]: event severity: corrected\n  {1}[Hardware Error]:   device_id: 0000:00:00.0\n  {1}[Hardware Error]:   vendor_id: 0x8086, device_id: 0x2020\n  {1}[Hardware Error]:   aer_cor_status: 0x00001000, aer_cor_mask: 0x00002000\n  BUG: kernel NULL pointer dereference, address: 0000000000000264\n  RIP: 0010:___ratelimit+0xc/0x1b0\n  pci_print_aer+0x141/0x360\n  aer_recover_work_func+0xb5/0x130\n\n[8086:2020] is an Intel \"Sky Lake-E DMI3 Registers\" device that claims to\nbe a Root Port but does not advertise an AER Capability.\n\nAdd a NULL check in aer_ratelimit() to avoid the NULL pointer dereference.\nNote that this also prevents ratelimiting these events from GHES.\n\n[bhelgaas: add crash details to commit log]","publishedAt":"2025-10-28T11:48:16.335Z","updatedAt":"2026-05-11T21:41:12.240Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a57f2bfb4a5863f83087867c0e671f2418212d23","status":"affected","lessThan":"41683624cbff0a26bb7e0627f4a7e1b51a8779a8","versionType":"git"},{"version":"a57f2bfb4a5863f83087867c0e671f2418212d23","status":"affected","lessThan":"deb2f228388ff3a9d0623e3b59a053e9235c341d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pcie/aer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.17.3","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pcie/aer.c"]}],"references":["https://git.kernel.org/stable/c/41683624cbff0a26bb7e0627f4a7e1b51a8779a8","https://git.kernel.org/stable/c/deb2f228388ff3a9d0623e3b59a053e9235c341d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:09.358Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/40xxx/CVE-2025-40034.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-40034","state":"PUBLISHED","datePublished":"2025-10-28T11:48:16.335Z","dateUpdated":"2026-05-11T21:41:12.240Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-04-16T07:20:57.153Z"},"containers":{"cna":{"title":"PCI/AER: Avoid NULL pointer dereference in aer_ratelimit()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nPCI/AER: Avoid NULL pointer dereference in aer_ratelimit()\n\nWhen platform firmware supplies error information to the OS, e.g., via the\nACPI APEI GHES mechanism, it may identify an error source device that\ndoesn't advertise an AER Capability and therefore dev->aer_info, which\ncontains AER stats and ratelimiting data, is NULL.\n\npci_dev_aer_stats_incr() already checks dev->aer_info for NULL, but\naer_ratelimit() did not, leading to NULL pointer dereferences like this one\nfrom the URL below:\n\n  {1}[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 0\n  {1}[Hardware Error]: event severity: corrected\n  {1}[Hardware Error]:   device_id: 0000:00:00.0\n  {1}[Hardware Error]:   vendor_id: 0x8086, device_id: 0x2020\n  {1}[Hardware Error]:   aer_cor_status: 0x00001000, aer_cor_mask: 0x00002000\n  BUG: kernel NULL pointer dereference, address: 0000000000000264\n  RIP: 0010:___ratelimit+0xc/0x1b0\n  pci_print_aer+0x141/0x360\n  aer_recover_work_func+0xb5/0x130\n\n[8086:2020] is an Intel \"Sky Lake-E DMI3 Registers\" device that claims to\nbe a Root Port but does not advertise an AER Capability.\n\nAdd a NULL check in aer_ratelimit() to avoid the NULL pointer dereference.\nNote that this also prevents ratelimiting these events from GHES.\n\n[bhelgaas: add crash details to commit log]"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a57f2bfb4a5863f83087867c0e671f2418212d23","status":"affected","lessThan":"41683624cbff0a26bb7e0627f4a7e1b51a8779a8","versionType":"git"},{"version":"a57f2bfb4a5863f83087867c0e671f2418212d23","status":"affected","lessThan":"deb2f228388ff3a9d0623e3b59a053e9235c341d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pcie/aer.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.17.3","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/pci/pcie/aer.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/41683624cbff0a26bb7e0627f4a7e1b51a8779a8"},{"url":"https://git.kernel.org/stable/c/deb2f228388ff3a9d0623e3b59a053e9235c341d"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:41:12.240Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.17.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}