{"id":"CVE-2026-31395","state":"PUBLISHED","title":"bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler\n\nThe ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in\nbnxt_async_event_process() uses a firmware-supplied 'type' field\ndirectly as an index into bp->bs_trace[] without bounds validation.\n\nThe 'type' field is a 16-bit value extracted from DMA-mapped completion\nring memory that the NIC writes directly to host RAM. A malicious or\ncompromised NIC can supply any value from 0 to 65535, causing an\nout-of-bounds access into kernel heap memory.\n\nThe bnxt_bs_trace_check_wrap() call then dereferences bs_trace->magic_byte\nand writes to bs_trace->last_offset and bs_trace->wrapped, leading to\nkernel memory corruption or a crash.\n\nFix by adding a bounds check and defining BNXT_TRACE_MAX as\nDBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently\ndefined firmware trace types (0x0 through 0xc).","publishedAt":"2026-04-03T15:15:59.590Z","updatedAt":"2026-05-11T22:07:52.201Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9","status":"affected","lessThan":"19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8","versionType":"git"},{"version":"84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9","status":"affected","lessThan":"b7c7a275447c6d4bf4a36a134682e2e4e20efd4b","versionType":"git"},{"version":"84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9","status":"affected","lessThan":"64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/bnxt/bnxt.c","drivers/net/ethernet/broadcom/bnxt/bnxt.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/bnxt/bnxt.c","drivers/net/ethernet/broadcom/bnxt/bnxt.h"]}],"references":["https://git.kernel.org/stable/c/19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8","https://git.kernel.org/stable/c/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b","https://git.kernel.org/stable/c/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31395.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31395","state":"PUBLISHED","datePublished":"2026-04-03T15:15:59.590Z","dateUpdated":"2026-05-11T22:07:52.201Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.085Z"},"containers":{"cna":{"title":"bnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbnxt_en: fix OOB access in DBG_BUF_PRODUCER async event handler\n\nThe ASYNC_EVENT_CMPL_EVENT_ID_DBG_BUF_PRODUCER handler in\nbnxt_async_event_process() uses a firmware-supplied 'type' field\ndirectly as an index into bp->bs_trace[] without bounds validation.\n\nThe 'type' field is a 16-bit value extracted from DMA-mapped completion\nring memory that the NIC writes directly to host RAM. A malicious or\ncompromised NIC can supply any value from 0 to 65535, causing an\nout-of-bounds access into kernel heap memory.\n\nThe bnxt_bs_trace_check_wrap() call then dereferences bs_trace->magic_byte\nand writes to bs_trace->last_offset and bs_trace->wrapped, leading to\nkernel memory corruption or a crash.\n\nFix by adding a bounds check and defining BNXT_TRACE_MAX as\nDBG_LOG_BUFFER_FLUSH_REQ_TYPE_ERR_QPC_TRACE + 1 to cover all currently\ndefined firmware trace types (0x0 through 0xc)."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9","status":"affected","lessThan":"19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8","versionType":"git"},{"version":"84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9","status":"affected","lessThan":"b7c7a275447c6d4bf4a36a134682e2e4e20efd4b","versionType":"git"},{"version":"84fcd9449fd7882ddfb05ba64d75f9be2d29b2e9","status":"affected","lessThan":"64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/bnxt/bnxt.c","drivers/net/ethernet/broadcom/bnxt/bnxt.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.13","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.13","versionType":"semver"},{"version":"6.18.20","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.10","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/broadcom/bnxt/bnxt.c","drivers/net/ethernet/broadcom/bnxt/bnxt.h"]}],"references":[{"url":"https://git.kernel.org/stable/c/19aa416eed9e4aaf1bbe8da0f7bd9a9be31158c8"},{"url":"https://git.kernel.org/stable/c/b7c7a275447c6d4bf4a36a134682e2e4e20efd4b"},{"url":"https://git.kernel.org/stable/c/64dcbde7f8f870a4f2d9daf24ffb06f9748b5dd3"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:07:52.201Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.19.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}