{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64124", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.036Z", "datePublished": "2026-07-19T15:40:21.879Z", "dateUpdated": "2026-07-19T15:40:21.879Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-19T15:40:21.879Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: devmem: reject dma-buf bind with non-page-aligned size or SG length\n\nnet_devmem_bind_dmabuf() trusts dmabuf->size and sg_dma_len() to be\nPAGE_SIZE multiples without checking:\n\n - tx_vec is sized dmabuf->size / PAGE_SIZE, and\n net_devmem_get_niov_at() only bounds-checks virt_addr < dmabuf->size\n before indexing tx_vec[virt_addr / PAGE_SIZE]. With size =\n N*PAGE_SIZE + r (1 <= r < PAGE_SIZE), sendmsg() at iov_base =\n N*PAGE_SIZE passes the bound check and reads tx_vec[N] -- one past.\n\n - owner->area.num_niovs = len / PAGE_SIZE while gen_pool_add_owner()\n covers the full byte len, so a non-page-multiple non-final sg\n desyncs num_niovs from the gen_pool region for every later sg, on\n both RX and TX.\n\ndma-buf does not require page-aligned sizes, so the bind path has to\nenforce what its own indexing assumes. Reject both with -EINVAL.\n\nThe size check is TX-only (only tx_vec is sized off dmabuf->size); the\nSG-length check covers both directions."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/devmem.c"], "versions": [{"version": "bd61848900bff597764238f3a8ec67c815cd316e", "lessThan": "134c517dfa63203287b2aad6558017f42435a02e", "status": "affected", "versionType": "git"}, {"version": "bd61848900bff597764238f3a8ec67c815cd316e", "lessThan": "d5008e4e4ee6b739256b796702a7d1aae1b5c3b4", "status": "affected", "versionType": "git"}, {"version": "bd61848900bff597764238f3a8ec67c815cd316e", "lessThan": "4eb82ba543421e9e38cc14e4e82058b78850df50", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/devmem.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.16", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/134c517dfa63203287b2aad6558017f42435a02e"}, {"url": "https://git.kernel.org/stable/c/d5008e4e4ee6b739256b796702a7d1aae1b5c3b4"}, {"url": "https://git.kernel.org/stable/c/4eb82ba543421e9e38cc14e4e82058b78850df50"}], "title": "net: devmem: reject dma-buf bind with non-page-aligned size or SG length", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: net: devmem: reject dma-buf bind with non-page-aligned size or SG length", "id": "2502601", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502601"}, "csaw": false, "cwe": "CWE-125", "details": ["A flaw was found in the Linux kernel's network device memory (net: devmem) component. This vulnerability allows an attacker to trigger an out-of-bounds read by providing specially crafted Direct Memory Access (DMA) buffers with non-page-aligned sizes or Scatter-Gather (SG) list lengths. This could lead to information disclosure or memory corruption, potentially impacting system stability and data integrity."], "name": "CVE-2026-64124", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64124\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64124\nhttps://lore.kernel.org/linux-cve-announce/2026071925-CVE-2026-64124-0de6@gregkh/T"]}

{}