{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74410", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.892Z", "datePublished": "2026-08-15T05:59:18.039Z", "dateUpdated": "2026-08-17T05:46:53.802Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:53.802Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer\n\nIn rtw_pci_rx_napi(), new_len is computed as the sum of pkt_len (14-bit\ndescriptor field, max 16383) and pkt_offset (drv_info_sz + shift, both\nfirmware-controlled). The result can exceed RTK_PCI_RX_BUF_SIZE (11478),\ncausing an out-of-bounds read from the pre-allocated DMA buffer when\nskb_put_data copies new_len bytes. The USB transport already validates\nthis (rtw_usb_rx_data_put checks against RTW_USB_MAX_RECVBUF_SZ); the\nPCIe path does not.\n\nAdd a check that new_len does not exceed the DMA buffer size." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:A - The bug is in rtw_pci_rx_napi() on the rtw88 PCIe WiFi RX path, reached when firmware DMAs received 802.11 frames and raises IMR_ROK; exploitation requires transmitting crafted or maximum-size WiFi frames within radio range, which is an adjacent wireless attack per kernel CVSS guidance.\nAC:L - An adjacent attacker can reliably trigger the bug by sending WiFi traffic that causes firmware to populate RX descriptors with pkt_len (up to 16383) plus pkt_offset (drv_info_sz+shift); sums above RTK_PCI_RX_BUF_SIZE (11478) are possible even with max VHT MPDUs (~11454 bytes), and the PCIe path lacked the USB driver's length validation.\nPR:N - No local account, capabilities, or namespace privileges on the victim are required; any unauthenticated attacker in WiFi range can cause the device to receive frames and invoke the driver RX interrupt/NAPI handler without victim credentials or association to the attacker's network.\nUI:N - Exploitation requires only that the rtw88 PCIe interface is active and receiving frames, which is the default on laptops, desktops, and many embedded systems with WiFi enabled; no additional victim actions such as opening files or mounting filesystems are needed.\nS:U - The vulnerability is confined to kernel memory accessed by the rtw88 host driver during RX processing on the same system; it does not cross a VM, container, or IOMMU security boundary to impact a separate security authority.\nC:H - skb_put_data() copies new_len bytes from a 11478-byte DMA RX skb without bounds checking, performing an out-of-bounds kernel heap read of up to thousands of bytes of adjacent slab memory that may contain pointers, keys, or other sensitive data subsequently embedded in the RX skb.\nI:N - The flaw is an out-of-bounds read via memcpy from the undersized RX buffer into a separately allocated skb; it does not directly overwrite kernel memory or provide an arbitrary write primitive, though leaked data could aid separate exploitation.\nA:H - Reading substantially beyond the mapped 11478-byte RX DMA buffer can access unmapped pages or slab redzones and provoke a kernel fault/oops during interrupt/NAPI processing, and repeated malicious frames can disrupt WiFi RX availability on affected rtw88 PCIe devices." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/realtek/rtw88/pci.c" ], "versions": [ { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "913bd7d3d3d842b5c1d2b908a0201efa8fc79793", "status": "affected", "versionType": "git" }, { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "45abc14ab3f15da7d689f1a8809c1a01240a94d9", "status": "affected", "versionType": "git" }, { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "08193e733e5d4790e6c937af86d78793b02709be", "status": "affected", "versionType": "git" }, { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "6a3c384393d3f0b41669ed5a2e88744aad9d87c8", "status": "affected", "versionType": "git" }, { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "26c183a86ea4dd1f2ff90c6f783649e7f5722a10", "status": "affected", "versionType": "git" }, { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "01155ded5d4dad61840a9a3c33ab56778ef1f100", "status": "affected", "versionType": "git" }, { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "1554fa522f16ec7c5c342ad33fe734eeb6eb2452", "status": "affected", "versionType": "git" }, { "version": "e3037485c68ec1a299ff41160d8fedbd4abc29b9", "lessThan": "6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6", "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/wireless/realtek/rtw88/pci.c" ], "versions": [ { "version": "5.2", "status": "affected" }, { "version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "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": "5.2", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/913bd7d3d3d842b5c1d2b908a0201efa8fc79793" }, { "url": "https://git.kernel.org/stable/c/45abc14ab3f15da7d689f1a8809c1a01240a94d9" }, { "url": "https://git.kernel.org/stable/c/08193e733e5d4790e6c937af86d78793b02709be" }, { "url": "https://git.kernel.org/stable/c/6a3c384393d3f0b41669ed5a2e88744aad9d87c8" }, { "url": "https://git.kernel.org/stable/c/26c183a86ea4dd1f2ff90c6f783649e7f5722a10" }, { "url": "https://git.kernel.org/stable/c/01155ded5d4dad61840a9a3c33ab56778ef1f100" }, { "url": "https://git.kernel.org/stable/c/1554fa522f16ec7c5c342ad33fe734eeb6eb2452" }, { "url": "https://git.kernel.org/stable/c/6e76e9ed273dfb4b3333a5ebbb94958cc5752ab6" } ], "title": "wifi: rtw88: fix OOB read from firmware RX descriptor exceeding DMA buffer", "x_generator": { "engine": "bippy-1.2.0" } } } }