CVE-2026-74285

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74285", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.881Z", "datePublished": "2026-08-15T05:57:53.907Z", "dateUpdated": "2026-08-17T05:45:25.616Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:45:25.616Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Stop leased rxq before uninstalling its memory provider\n\nnetif_rxq_cleanup_unlease() tears down the memory provider that was\ninstalled on a physical RX queue through a netkit queue lease. It\ncurrently revokes the provider's DMA mappings before stopping the\nphysical queue:\n\n __netif_mp_uninstall_rxq(virt_rxq, p); /* DMA unmap */\n __netif_mp_close_rxq(phys_rxq->dev, rxq_idx, p); /* queue stop */\n\nThis inverts the ordering used by the regular teardown paths (normal\ndevice unregister and the io_uring zcrx close path), which stop the\nqueue before revoking the provider's mappings.\n\nWith the physical queue still live, its NAPI can keep consuming\nnet_iov entries from the page_pool alloc cache after the\n__netif_mp_uninstall_rxq() has already cleared their dma_addr,\nopening a window for the device to DMA to a stale or zero address.\n\nFix it by swapping the two calls so the queue is stopped (and its\nNAPI quiesced) before the provider is uninstalled. No functional\nregression was observed across repeated runs of the nk_qlease.py\nHW selftest, which exercises the lease teardown path; this was\ntested against fbnic QEMU emulation."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires local netlink/rtnl actions (netdev-genl QUEUE_CREATE, netkit teardown via ip link del) that invoke netif_rxq_cleanup_unlease(); remote packets alone cannot reach this teardown path.\nAC:L - The attacker controls both sides of the race by keeping RX traffic/NAPI active on the leased physical queue while concurrently deleting netkit or tearing down the lease with a memory provider installed.\nPR:L - Queue leasing, netkit creation, and memory-provider binding all require CAP_NET_ADMIN, which unprivileged users can obtain inside user/network namespaces via unshare without init-namespace root.\nUI:N - No victim interaction is required; the attacker configures the netkit lease, installs an io_uring zcrx or devmem memory provider, generates RX load, and triggers lease teardown themselves.\nS:C - Stale or zero DMA addresses let the physical NIC write outside intended buffers, crossing container/host and DMA mapping boundaries when a user-namespace tenant leases a host physical RX queue.\nC:H - Premature DMA unmap while NAPI still hands net_iov buffers to hardware enables misplaced RX DMA that can disclose or corrupt adjacent kernel/host memory beyond the intended mapping.\nI:H - The device may DMA received packet data to a cleared or stale dma_addr, providing an attacker-influenced arbitrary kernel memory write primitive during queue-lease teardown.\nA:H - Invalid DMA to stale or zero addresses can cause kernel oops/panic, NIC hangs, or fatal memory corruption during lease teardown even when full exploitation is not attempted."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/core/netdev_rx_queue.c"], "versions": [{"version": "5602ad61ebee99c83081fba1aaf5814736edc3e7", "lessThan": "03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8", "status": "affected", "versionType": "git"}, {"version": "5602ad61ebee99c83081fba1aaf5814736edc3e7", "lessThan": "37314c9dbe95b4d924c7b61aaf563cec4f4e4133", "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/netdev_rx_queue.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "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": "7.1", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8"}, {"url": "https://git.kernel.org/stable/c/37314c9dbe95b4d924c7b61aaf563cec4f4e4133"}], "title": "net: Stop leased rxq before uninstalling its memory provider", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/core/netdev_rx_queue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8", "status": "affected", "version": "5602ad61ebee99c83081fba1aaf5814736edc3e7", "versionType": "git"}, {"lessThan": "37314c9dbe95b4d924c7b61aaf563cec4f4e4133", "status": "affected", "version": "5602ad61ebee99c83081fba1aaf5814736edc3e7", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/core/netdev_rx_queue.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "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: Stop leased rxq before uninstalling its memory provider\n\nnetif_rxq_cleanup_unlease() tears down the memory provider that was\ninstalled on a physical RX queue through a netkit queue lease. It\ncurrently revokes the provider's DMA mappings before stopping the\nphysical queue:\n\n __netif_mp_uninstall_rxq(virt_rxq, p); /* DMA unmap */\n __netif_mp_close_rxq(phys_rxq->dev, rxq_idx, p); /* queue stop */\n\nThis inverts the ordering used by the regular teardown paths (normal\ndevice unregister and the io_uring zcrx close path), which stop the\nqueue before revoking the provider's mappings.\n\nWith the physical queue still live, its NAPI can keep consuming\nnet_iov entries from the page_pool alloc cache after the\n__netif_mp_uninstall_rxq() has already cleared their dma_addr,\nopening a window for the device to DMA to a stale or zero address.\n\nFix it by swapping the two calls so the queue is stopped (and its\nNAPI quiesced) before the provider is uninstalled. No functional\nregression was observed across repeated runs of the nk_qlease.py\nHW selftest, which exercises the lease teardown path; this was\ntested against fbnic QEMU emulation."}], "id": "CVE-2026-74285", "lastModified": "2026-08-17T06:19:22.390", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:22:28.037", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37314c9dbe95b4d924c7b61aaf563cec4f4e4133"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net: Stop leased rxq before uninstalling its memory provider", "id": "2516920", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516920"}, "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-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: Stop leased rxq before uninstalling its memory provider\nnetif_rxq_cleanup_unlease() tears down the memory provider that was\ninstalled on a physical RX queue through a netkit queue lease. It\ncurrently revokes the provider's DMA mappings before stopping the\nphysical queue:\n__netif_mp_uninstall_rxq(virt_rxq, p); /* DMA unmap */\n__netif_mp_close_rxq(phys_rxq->dev, rxq_idx, p); /* queue stop */\nThis inverts the ordering used by the regular teardown paths (normal\ndevice unregister and the io_uring zcrx close path), which stop the\nqueue before revoking the provider's mappings.\nWith the physical queue still live, its NAPI can keep consuming\nnet_iov entries from the page_pool alloc cache after the\n__netif_mp_uninstall_rxq() has already cleared their dma_addr,\nopening a window for the device to DMA to a stale or zero address.\nFix it by swapping the two calls so the queue is stopped (and its\nNAPI quiesced) before the provider is uninstalled. No functional\nregression was observed across repeated runs of the nk_qlease.py\nHW selftest, which exercises the lease teardown path; this was\ntested against fbnic QEMU emulation.", "A flaw was found in the Linux kernel's network subsystem. An issue in the `netif_rxq_cleanup_unlease()` function, responsible for tearing down network queue memory providers, allows a device to perform Direct Memory Access (DMA) to an incorrect memory address. This occurs because the DMA mappings are revoked before the physical queue is stopped, creating a window where the device can access stale or zeroed memory. This could lead to memory corruption and system instability."], "name": "CVE-2026-74285", "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"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74285\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74285\nhttps://lore.kernel.org/linux-cve-announce/2026081547-CVE-2026-74285-6a80@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5602ad61ebee99c83081fba1aaf5814736edc3e7,03f4c6ed3cffbfce0b85a3a0193d08a46692a9f8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5602ad61ebee99c83081fba1aaf5814736edc3e7,37314c9dbe95b4d924c7b61aaf563cec4f4e4133)"}}], "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": "7.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,7.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc1,*]"}}], "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": "2026-08-15T12:45:06.850784+00:00", "updated": "2026-08-22T03:45:03.677266+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}