{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2023-53641",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-10-07T15:16:59.658Z",
        "datePublished": "2025-10-07T15:19:41.028Z",
        "dateUpdated": "2026-05-11T19:49:05.188Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-11T19:49:05.188Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath9k: hif_usb: fix memory leak of remain_skbs\n\nhif_dev->remain_skb is allocated and used exclusively in\nath9k_hif_usb_rx_stream(). It is implied that an allocated remain_skb is\nprocessed and subsequently freed (in error paths) only during the next\ncall of ath9k_hif_usb_rx_stream().\n\nSo, if the urbs are deallocated between those two calls due to the device\ndeinitialization or suspend, it is possible that ath9k_hif_usb_rx_stream()\nis not called next time and the allocated remain_skb is leaked. Our local\nSyzkaller instance was able to trigger that.\n\nremain_skb makes sense when receiving two consecutive urbs which are\nlogically linked together, i.e. a specific data field from the first skb\nindicates a cached skb to be allocated, memcpy'd with some data and\nsubsequently processed in the next call to ath9k_hif_usb_rx_stream(). Urbs\ndeallocation supposedly makes that link irrelevant so we need to free the\ncached skb in those cases.\n\nFix the leak by introducing a function to explicitly free remain_skb (if\nit is not NULL) when the rx urbs have been deallocated. remain_skb is NULL\nwhen it has not been allocated at all (hif_dev struct is kzalloced) or\nwhen it has been processed in next call to ath9k_hif_usb_rx_stream().\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/wireless/ath/ath9k/hif_usb.c"
                    ],
                    "versions": [
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                            "version": "fb9987d0f748c983bb795a86f47522313f701a08",
                            "lessThan": "6719e3797ec52cd144c8a5ba8aaab36674800585",
                            "status": "affected",
                            "versionType": "git"
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                            "lessThan": "d9899318660791141ea6002fda5577b2c5d7386e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fb9987d0f748c983bb795a86f47522313f701a08",
                            "lessThan": "320d760a35273aa815d58b57e4fd9ba5279a3489",
                            "status": "affected",
                            "versionType": "git"
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                        {
                            "version": "fb9987d0f748c983bb795a86f47522313f701a08",
                            "lessThan": "59073060fe0950c6ecbe12bdc06469dcac62128d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fb9987d0f748c983bb795a86f47522313f701a08",
                            "lessThan": "9b9356a3014123f0ce4b50d9278c1265173150ab",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fb9987d0f748c983bb795a86f47522313f701a08",
                            "lessThan": "f0931fc8f4b6847c72e170d2326861c0a081d680",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "fb9987d0f748c983bb795a86f47522313f701a08",
                            "lessThan": "8f02d538878c9b1501f624595eb22ee4e5e0ff84",
                            "status": "affected",
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                        },
                        {
                            "version": "fb9987d0f748c983bb795a86f47522313f701a08",
                            "lessThan": "7654cc03eb699297130b693ec34e25f77b17c947",
                            "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/ath/ath9k/hif_usb.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.35",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.35",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "4.19.283",
                            "lessThanOrEqual": "4.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.243",
                            "lessThanOrEqual": "5.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.180",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.111",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.28",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.2.15",
                            "lessThanOrEqual": "6.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.3.2",
                            "lessThanOrEqual": "6.3.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.4",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
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                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "2.6.35",
                                    "versionEndExcluding": "4.19.283"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/6719e3797ec52cd144c8a5ba8aaab36674800585"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d9899318660791141ea6002fda5577b2c5d7386e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/320d760a35273aa815d58b57e4fd9ba5279a3489"
                },
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                    "url": "https://git.kernel.org/stable/c/59073060fe0950c6ecbe12bdc06469dcac62128d"
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                },
                {
                    "url": "https://git.kernel.org/stable/c/8f02d538878c9b1501f624595eb22ee4e5e0ff84"
                },
                {
                    "url": "https://git.kernel.org/stable/c/7654cc03eb699297130b693ec34e25f77b17c947"
                }
            ],
            "title": "wifi: ath9k: hif_usb: fix memory leak of remain_skbs",
            "x_generator": {
                "engine": "bippy-1.2.0"
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}