CVE-2026-72343

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At that point priv->stats_nch is still zero,\nbecause it is only ever incremented in mlx5e_channel_stats_alloc(),\nwhich is reached only from mlx5e_open_channel().\n\nmlx5e_hv_vhca_stats_buf_size() therefore returns 0, and\nkvzalloc(0, GFP_KERNEL) returns ZERO_SIZE_PTR ((void *)16) rather\nthan NULL. The \"if (!buf)\" guard does not catch this, and\nmlx5e_hv_vhca_stats_create() completes \"successfully\" with\npriv->stats_agent.buf set to ZERO_SIZE_PTR.\n\nOnce channels are opened (priv->stats_nch > 0) and the hypervisor\nenables stats reporting, mlx5e_hv_vhca_stats_work() recomputes\nbuf_len using the new non-zero stats_nch and calls\nmemset(buf, 0, buf_len) on ZERO_SIZE_PTR, faulting at address 0x10.\n\nAllocate the buffer based on priv->max_nch, which is set in\nmlx5e_priv_init() and is the upper bound on stats_nch:\n\n - Add a separate helper mlx5e_hv_vhca_stats_buf_max_size() that\n returns sizeof(per_ring_stats) * max(max_nch, stats_nch), and\n use it for the kvzalloc() in mlx5e_hv_vhca_stats_create().\n - Keep mlx5e_hv_vhca_stats_buf_size() (which returns based on\n stats_nch) for the worker's active payload size, so the wire\n format (block->rings = stats_nch) and the amount of data filled\n by mlx5e_hv_vhca_fill_stats() are unchanged.\n\nThe max(max_nch, stats_nch) guard handles the rare case where\nmlx5e_attach_netdev() recomputes max_nch downward across a\ndetach/resume cycle while priv->stats_nch persists (mlx5e_detach_netdev\ndoes not call mlx5e_priv_cleanup, so stats_nch is only reset when\nthe netdev is destroyed). Without the guard, the worker could compute\nbuf_len from stats_nch and overrun the smaller buffer allocated based\non the reduced max_nch.\n\nAllocating a non-zero buffer also makes the kvzalloc() failure path in\nmlx5e_hv_vhca_stats_create() reachable for the first time: it returns\nearly without (re)creating the agent. Clear\npriv->stats_agent.{agent,buf} in mlx5e_hv_vhca_stats_destroy() after\nfreeing them, so that if a later create() bails out on this path, a\nsubsequent teardown does not double-free the stale agent/buffer left\nfrom a previous enable/disable cycle.\n\nThis mirrors the existing mlx5e pattern of preallocating arrays of\nsize max_nch (e.g. priv->channel_stats) and lazily populating\nentries up to stats_nch on demand."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is reached via the Hyper-V VMBus PCI config back-channel (PCI_INVALIDATE_BLOCK) into mlx5e HV VHCA stats handling during mlx5e driver operation on Azure mlx5 NICs, not via remote network packets or guest syscall/ioctl paths.\nAC:L - mlx5e_nic_enable always calls mlx5e_hv_vhca_stats_create before mlx5e_open, so kvzalloc(0) deterministically stores ZERO_SIZE_PTR; once channels open and the hypervisor enables stats reporting, the worker always memset()s with buf_len>0 and faults.\nPR:N - On Azure/Hyper-V mlx5 VMs the host routinely drives VHCA stats collection over the PCI config back-channel during normal operation; no guest credentials, CAP_NET_ADMIN, or other elevated guest privileges are required beyond standard VM boot with the NIC active.\nUI:N - Triggering requires only normal VM boot and mlx5e driver bring-up with channels opened; no victim file open, mount, or other interactive administrator action is needed to reach the faulty memset path.\nS:U - Kernel memory corruption and panic are confined to the guest kernel running mlx5e on the affected VM; the bug does not cross VM/host, IOMMU, or other security boundaries into a separate authority.\nC:H - memset(buf,0,buf_len) on ZERO_SIZE_PTR is an out-of-bounds write from a near-NULL kernel address; per kernel guidance any such memory corruption can be leveraged for information disclosure even though the immediate operation writes zeros.\nI:H - The worker performs a large out-of-bounds write via memset on the bogus buffer pointer, and the pre-fix sizing logic can also overrun a too-small allocation when stats_nch exceeds max_nch after detach/resume, enabling arbitrary kernel write primitives.\nA:H - The memset on ZERO_SIZE_PTR faults at address 0x10 causing a kernel oops or panic, reliably denying availability of Azure/Hyper-V guests using CONFIG_PCI_HYPERV_INTERFACE mlx5 NICs whenever the hypervisor enables stats reporting."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"], "versions": [{"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "3b3a552cf88e10bb7bda88b29cf1fd8267043d50", "status": "affected", "versionType": "git"}, {"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "5b927dcec5f1087942bf123a82e64a3f66475f01", "status": "affected", "versionType": "git"}, {"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "22c1d5ecccf92c849bdca1556179aafc95794baf", "status": "affected", "versionType": "git"}, {"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4", "status": "affected", "versionType": "git"}, {"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "abc4c56427f144c96b2827a4db3b90eb5b7349a2", "status": "affected", "versionType": "git"}, {"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "25f6b929c7e379cbea7cb8caa67b49b2d1efae17", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"], "versions": [{"version": "5.17", "status": "affected"}, {"version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3b3a552cf88e10bb7bda88b29cf1fd8267043d50"}, {"url": "https://git.kernel.org/stable/c/5b927dcec5f1087942bf123a82e64a3f66475f01"}, {"url": "https://git.kernel.org/stable/c/22c1d5ecccf92c849bdca1556179aafc95794baf"}, {"url": "https://git.kernel.org/stable/c/420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4"}, {"url": "https://git.kernel.org/stable/c/abc4c56427f144c96b2827a4db3b90eb5b7349a2"}, {"url": "https://git.kernel.org/stable/c/25f6b929c7e379cbea7cb8caa67b49b2d1efae17"}], "title": "net/mlx5e: Fix HV VHCA stats zero-sized buffer allocation", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72343", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:47:27.911356Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:19.281Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-72343", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:47:27.911356Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:47:28.464Z"}}], "cna": {"title": "net/mlx5e: Fix HV VHCA stats zero-sized buffer allocation", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.4, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is reached via the Hyper-V VMBus PCI config back-channel (PCI_INVALIDATE_BLOCK) into mlx5e HV VHCA stats handling during mlx5e driver operation on Azure mlx5 NICs, not via remote network packets or guest syscall/ioctl paths.\nAC:L - mlx5e_nic_enable always calls mlx5e_hv_vhca_stats_create before mlx5e_open, so kvzalloc(0) deterministically stores ZERO_SIZE_PTR; once channels open and the hypervisor enables stats reporting, the worker always memset()s with buf_len>0 and faults.\nPR:N - On Azure/Hyper-V mlx5 VMs the host routinely drives VHCA stats collection over the PCI config back-channel during normal operation; no guest credentials, CAP_NET_ADMIN, or other elevated guest privileges are required beyond standard VM boot with the NIC active.\nUI:N - Triggering requires only normal VM boot and mlx5e driver bring-up with channels opened; no victim file open, mount, or other interactive administrator action is needed to reach the faulty memset path.\nS:U - Kernel memory corruption and panic are confined to the guest kernel running mlx5e on the affected VM; the bug does not cross VM/host, IOMMU, or other security boundaries into a separate authority.\nC:H - memset(buf,0,buf_len) on ZERO_SIZE_PTR is an out-of-bounds write from a near-NULL kernel address; per kernel guidance any such memory corruption can be leveraged for information disclosure even though the immediate operation writes zeros.\nI:H - The worker performs a large out-of-bounds write via memset on the bogus buffer pointer, and the pre-fix sizing logic can also overrun a too-small allocation when stats_nch exceeds max_nch after detach/resume, enabling arbitrary kernel write primitives.\nA:H - The memset on ZERO_SIZE_PTR faults at address 0x10 causing a kernel oops or panic, reliably denying availability of Azure/Hyper-V guests using CONFIG_PCI_HYPERV_INTERFACE mlx5 NICs whenever the hypervisor enables stats reporting."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "3b3a552cf88e10bb7bda88b29cf1fd8267043d50", "versionType": "git"}, {"status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "5b927dcec5f1087942bf123a82e64a3f66475f01", "versionType": "git"}, {"status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "22c1d5ecccf92c849bdca1556179aafc95794baf", "versionType": "git"}, {"status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4", "versionType": "git"}, {"status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "abc4c56427f144c96b2827a4db3b90eb5b7349a2", "versionType": "git"}, {"status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "25f6b929c7e379cbea7cb8caa67b49b2d1efae17", "versionType": "git"}], "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.17"}, {"status": "unaffected", "version": "0", "lessThan": "5.17", "versionType": "semver"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/3b3a552cf88e10bb7bda88b29cf1fd8267043d50"}, {"url": "https://git.kernel.org/stable/c/5b927dcec5f1087942bf123a82e64a3f66475f01"}, {"url": "https://git.kernel.org/stable/c/22c1d5ecccf92c849bdca1556179aafc95794baf"}, {"url": "https://git.kernel.org/stable/c/420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4"}, {"url": "https://git.kernel.org/stable/c/abc4c56427f144c96b2827a4db3b90eb5b7349a2"}, {"url": "https://git.kernel.org/stable/c/25f6b929c7e379cbea7cb8caa67b49b2d1efae17"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix HV VHCA stats zero-sized buffer allocation\n\nmlx5e_hv_vhca_stats_create() is called from mlx5e_nic_enable(),\nbefore mlx5e_open(). At that point priv->stats_nch is still zero,\nbecause it is only ever incremented in mlx5e_channel_stats_alloc(),\nwhich is reached only from mlx5e_open_channel().\n\nmlx5e_hv_vhca_stats_buf_size() therefore returns 0, and\nkvzalloc(0, GFP_KERNEL) returns ZERO_SIZE_PTR ((void *)16) rather\nthan NULL. The \"if (!buf)\" guard does not catch this, and\nmlx5e_hv_vhca_stats_create() completes \"successfully\" with\npriv->stats_agent.buf set to ZERO_SIZE_PTR.\n\nOnce channels are opened (priv->stats_nch > 0) and the hypervisor\nenables stats reporting, mlx5e_hv_vhca_stats_work() recomputes\nbuf_len using the new non-zero stats_nch and calls\nmemset(buf, 0, buf_len) on ZERO_SIZE_PTR, faulting at address 0x10.\n\nAllocate the buffer based on priv->max_nch, which is set in\nmlx5e_priv_init() and is the upper bound on stats_nch:\n\n - Add a separate helper mlx5e_hv_vhca_stats_buf_max_size() that\n returns sizeof(per_ring_stats) * max(max_nch, stats_nch), and\n use it for the kvzalloc() in mlx5e_hv_vhca_stats_create().\n - Keep mlx5e_hv_vhca_stats_buf_size() (which returns based on\n stats_nch) for the worker's active payload size, so the wire\n format (block->rings = stats_nch) and the amount of data filled\n by mlx5e_hv_vhca_fill_stats() are unchanged.\n\nThe max(max_nch, stats_nch) guard handles the rare case where\nmlx5e_attach_netdev() recomputes max_nch downward across a\ndetach/resume cycle while priv->stats_nch persists (mlx5e_detach_netdev\ndoes not call mlx5e_priv_cleanup, so stats_nch is only reset when\nthe netdev is destroyed). Without the guard, the worker could compute\nbuf_len from stats_nch and overrun the smaller buffer allocated based\non the reduced max_nch.\n\nAllocating a non-zero buffer also makes the kvzalloc() failure path in\nmlx5e_hv_vhca_stats_create() reachable for the first time: it returns\nearly without (re)creating the agent. Clear\npriv->stats_agent.{agent,buf} in mlx5e_hv_vhca_stats_destroy() after\nfreeing them, so that if a later create() bails out on this path, a\nsubsequent teardown does not double-free the stale agent/buffer left\nfrom a previous enable/disable cycle.\n\nThis mirrors the existing mlx5e pattern of preallocating arrays of\nsize max_nch (e.g. priv->channel_stats) and lazily populating\nentries up to stats_nch on demand."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "5.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "5.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:01.870Z"}}}, "cveMetadata": {"cveId": "CVE-2026-72343", "state": "PUBLISHED", "dateUpdated": "2026-10-16T18:55:19.281Z", "dateReserved": "2026-08-09T03:40:39.920Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:55:49.067Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3b3a552cf88e10bb7bda88b29cf1fd8267043d50", "status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "versionType": "git"}, {"lessThan": "5b927dcec5f1087942bf123a82e64a3f66475f01", "status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "versionType": "git"}, {"lessThan": "22c1d5ecccf92c849bdca1556179aafc95794baf", "status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "versionType": "git"}, {"lessThan": "420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4", "status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "versionType": "git"}, {"lessThan": "abc4c56427f144c96b2827a4db3b90eb5b7349a2", "status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "versionType": "git"}, {"lessThan": "25f6b929c7e379cbea7cb8caa67b49b2d1efae17", "status": "affected", "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.17"}, {"lessThan": "5.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix HV VHCA stats zero-sized buffer allocation\n\nmlx5e_hv_vhca_stats_create() is called from mlx5e_nic_enable(),\nbefore mlx5e_open(). At that point priv->stats_nch is still zero,\nbecause it is only ever incremented in mlx5e_channel_stats_alloc(),\nwhich is reached only from mlx5e_open_channel().\n\nmlx5e_hv_vhca_stats_buf_size() therefore returns 0, and\nkvzalloc(0, GFP_KERNEL) returns ZERO_SIZE_PTR ((void *)16) rather\nthan NULL. The \"if (!buf)\" guard does not catch this, and\nmlx5e_hv_vhca_stats_create() completes \"successfully\" with\npriv->stats_agent.buf set to ZERO_SIZE_PTR.\n\nOnce channels are opened (priv->stats_nch > 0) and the hypervisor\nenables stats reporting, mlx5e_hv_vhca_stats_work() recomputes\nbuf_len using the new non-zero stats_nch and calls\nmemset(buf, 0, buf_len) on ZERO_SIZE_PTR, faulting at address 0x10.\n\nAllocate the buffer based on priv->max_nch, which is set in\nmlx5e_priv_init() and is the upper bound on stats_nch:\n\n - Add a separate helper mlx5e_hv_vhca_stats_buf_max_size() that\n returns sizeof(per_ring_stats) * max(max_nch, stats_nch), and\n use it for the kvzalloc() in mlx5e_hv_vhca_stats_create().\n - Keep mlx5e_hv_vhca_stats_buf_size() (which returns based on\n stats_nch) for the worker's active payload size, so the wire\n format (block->rings = stats_nch) and the amount of data filled\n by mlx5e_hv_vhca_fill_stats() are unchanged.\n\nThe max(max_nch, stats_nch) guard handles the rare case where\nmlx5e_attach_netdev() recomputes max_nch downward across a\ndetach/resume cycle while priv->stats_nch persists (mlx5e_detach_netdev\ndoes not call mlx5e_priv_cleanup, so stats_nch is only reset when\nthe netdev is destroyed). Without the guard, the worker could compute\nbuf_len from stats_nch and overrun the smaller buffer allocated based\non the reduced max_nch.\n\nAllocating a non-zero buffer also makes the kvzalloc() failure path in\nmlx5e_hv_vhca_stats_create() reachable for the first time: it returns\nearly without (re)creating the agent. Clear\npriv->stats_agent.{agent,buf} in mlx5e_hv_vhca_stats_destroy() after\nfreeing them, so that if a later create() bails out on this path, a\nsubsequent teardown does not double-free the stale agent/buffer left\nfrom a previous enable/disable cycle.\n\nThis mirrors the existing mlx5e pattern of preallocating arrays of\nsize max_nch (e.g. priv->channel_stats) and lazily populating\nentries up to stats_nch on demand."}], "id": "CVE-2026-72343", "lastModified": "2026-10-16T19:17:24.280", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-72343", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:47:27.911356Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:07.650", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/22c1d5ecccf92c849bdca1556179aafc95794baf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/25f6b929c7e379cbea7cb8caa67b49b2d1efae17"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b3a552cf88e10bb7bda88b29cf1fd8267043d50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5b927dcec5f1087942bf123a82e64a3f66475f01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/abc4c56427f144c96b2827a4db3b90eb5b7349a2"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/mlx5e: Fix HV VHCA stats zero-sized buffer allocation", "id": "2516442", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516442"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/mlx5e: Fix HV VHCA stats zero-sized buffer allocation\nmlx5e_hv_vhca_stats_create() is called from mlx5e_nic_enable(),\nbefore mlx5e_open(). At that point priv->stats_nch is still zero,\nbecause it is only ever incremented in mlx5e_channel_stats_alloc(),\nwhich is reached only from mlx5e_open_channel().\nmlx5e_hv_vhca_stats_buf_size() therefore returns 0, and\nkvzalloc(0, GFP_KERNEL) returns ZERO_SIZE_PTR ((void *)16) rather\nthan NULL. The \"if (!buf)\" guard does not catch this, and\nmlx5e_hv_vhca_stats_create() completes \"successfully\" with\npriv->stats_agent.buf set to ZERO_SIZE_PTR.\nOnce channels are opened (priv->stats_nch > 0) and the hypervisor\nenables stats reporting, mlx5e_hv_vhca_stats_work() recomputes\nbuf_len using the new non-zero stats_nch and calls\nmemset(buf, 0, buf_len) on ZERO_SIZE_PTR, faulting at address 0x10.\nAllocate the buffer based on priv->max_nch, which is set in\nmlx5e_priv_init() and is the upper bound on stats_nch:\n- Add a separate helper mlx5e_hv_vhca_stats_buf_max_size() that\nreturns sizeof(per_ring_stats) * max(max_nch, stats_nch), and\nuse it for the kvzalloc() in mlx5e_hv_vhca_stats_create().\n- Keep mlx5e_hv_vhca_stats_buf_size() (which returns based on\nstats_nch) for the worker's active payload size, so the wire\nformat (block->rings = stats_nch) and the amount of data filled\nby mlx5e_hv_vhca_fill_stats() are unchanged.\nThe max(max_nch, stats_nch) guard handles the rare case where\nmlx5e_attach_netdev() recomputes max_nch downward across a\ndetach/resume cycle while priv->stats_nch persists (mlx5e_detach_netdev\ndoes not call mlx5e_priv_cleanup, so stats_nch is only reset when\nthe netdev is destroyed). Without the guard, the worker could compute\nbuf_len from stats_nch and overrun the smaller buffer allocated based\non the reduced max_nch.\nAllocating a non-zero buffer also makes the kvzalloc() failure path in\nmlx5e_hv_vhca_stats_create() reachable for the first time: it returns\nearly without (re)creating the agent. Clear\npriv->stats_agent.{agent,buf} in mlx5e_hv_vhca_stats_destroy() after\nfreeing them, so that if a later create() bails out on this path, a\nsubsequent teardown does not double-free the stale agent/buffer left\nfrom a previous enable/disable cycle.\nThis mirrors the existing mlx5e pattern of preallocating arrays of\nsize max_nch (e.g. priv->channel_stats) and lazily populating\nentries up to stats_nch on demand.", "A flaw was found in the `net/mlx5e` component of the Linux kernel. A zero-sized buffer is allocated during the initialization of HV VHCA statistics. When the hypervisor later attempts to enable statistics reporting, a write operation is performed on this invalid memory address. This can lead to a kernel crash, resulting in a Denial of Service (DoS) for the system."], "name": "CVE-2026-72343", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72343\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72343\nhttps://lore.kernel.org/linux-cve-announce/2026081510-CVE-2026-72343-b443@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa691d0c9c0812b9045f3a9420862e47b3b92518,3b3a552cf88e10bb7bda88b29cf1fd8267043d50)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa691d0c9c0812b9045f3a9420862e47b3b92518,5b927dcec5f1087942bf123a82e64a3f66475f01)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa691d0c9c0812b9045f3a9420862e47b3b92518,22c1d5ecccf92c849bdca1556179aafc95794baf)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa691d0c9c0812b9045f3a9420862e47b3b92518,420aabb32da4381d8d7cdcaa6a77fad9eaceb0a4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa691d0c9c0812b9045f3a9420862e47b3b92518,abc4c56427f144c96b2827a4db3b90eb5b7349a2)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[fa691d0c9c0812b9045f3a9420862e47b3b92518,25f6b929c7e379cbea7cb8caa67b49b2d1efae17)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.17"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.17)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T18:45:03.372523+00:00", "updated": "2026-08-22T08:30:17.793556+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}