{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68373", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.386Z", "datePublished": "2026-08-10T12:03:51.663Z", "dateUpdated": "2026-08-19T16:34:33.308Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:34:33.308Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: at76c50x-usb: avoid length underflow in at76_guess_freq()\n\nat76_guess_freq() checks only that the received frame is at least a bare\n802.11 header (24 bytes) before subtracting the fixed management-body\noffset:\n\n\tlen -= el_off;\n\nFor both beacon and probe response frames, el_off is 36. If the frame is\nshorter than el_off, subtracting it causes the calculated IE length to\nwrap. The length is eventually passed to cfg80211_find_elem_match() as a\nvery large unsigned value, so the element walk runs beyond the RX skb.\n\nThis path is reached from at76_rx_tasklet() while scanning. If the device\ndelivers a truncated beacon or probe response, the oversized IE length\ncauses an out-of-bounds read during scanning.\n\nSkip the IE lookup if the frame does not reach the variable elements,\nbefore subtracting el_off." } ], "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 malformed frame is an over-the-air 802.11 beacon or probe response received by the at76c50x USB WLAN dongle and parsed in at76_rx_tasklet(); an attacker only needs to be within radio range of the victim, which is the adjacent-network (WiFi frame injection) case.\nAC:L - The attacker simply transmits a beacon/probe response whose body is shorter than the 36-byte fixed management offset with a valid FCS, and can repeat it continuously or answer the victim's probe requests during the routine scans that set priv->scanning, so triggering is reliable and fully attacker-timed.\nPR:N - No authentication, association, or any local privilege is required; the frame is parsed during scanning before any association or key exchange, so an entirely unauthenticated radio-range attacker reaches the bug.\nUI:N - Background and periodic scans are issued automatically by wpa_supplicant/NetworkManager without any user action, so no victim interaction is needed for the vulnerable path to run.\nS:U - The out-of-bounds read stays within the kernel's own memory and security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The underflowed length becomes ~4GB when widened to unsigned int, so the element walk reads far past the ~2.5KB RX skb slab object, and the out-of-bounds byte taken as el[2] is turned into rx_status.freq that userspace observes in scan results, allowing repeated frames to leak adjacent kernel heap contents.\nI:N - The defect is purely a read overrun; nothing outside the skb is written and the only attacker-influenced value is the reported channel/frequency, giving no memory-corruption or control-flow primitive.\nA:H - The unbounded element walk runs off the slab and can dereference unmapped memory while executing in tasklet/softirq context, producing a kernel oops or panic that the attacker can trigger repeatedly with injected frames." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/wireless/atmel/at76c50x-usb.c" ], "versions": [ { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "cb831aff2f850f72bc5ff5ad77d0a70bb5a84061", "status": "affected", "versionType": "git" }, { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "4875680d1703f56afa6257ba30244f2fb44ed205", "status": "affected", "versionType": "git" }, { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "b406f33d234f98c8b310fdab5cbb492d85e98e49", "status": "affected", "versionType": "git" }, { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "e165a1d295e7e814e13b0f92c86e5d48309509ce", "status": "affected", "versionType": "git" }, { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "bcde7249d45f52f994a9872bedf45994472ade77", "status": "affected", "versionType": "git" }, { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "fb1b50ab699211e777dca5ccfb648788b6a6e519", "status": "affected", "versionType": "git" }, { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "f742d9c98b5c504fc9e6744eef13a721c2aea486", "status": "affected", "versionType": "git" }, { "version": "1264b951463a00efebe1bb596499aaad620ec8af", "lessThan": "61a799ffd1e5a4fd3702d547828b7ff3d161468e", "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/atmel/at76c50x-usb.c" ], "versions": [ { "version": "2.6.30", "status": "affected" }, { "version": "0", "lessThan": "2.6.30", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "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": "2.6.30", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.30", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cb831aff2f850f72bc5ff5ad77d0a70bb5a84061" }, { "url": "https://git.kernel.org/stable/c/4875680d1703f56afa6257ba30244f2fb44ed205" }, { "url": "https://git.kernel.org/stable/c/b406f33d234f98c8b310fdab5cbb492d85e98e49" }, { "url": "https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce" }, { "url": "https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77" }, { "url": "https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519" }, { "url": "https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486" }, { "url": "https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e" } ], "title": "wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()", "x_generator": { "engine": "bippy-1.2.0" } } } }