{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74678", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.925Z", "datePublished": "2026-08-22T15:32:46.765Z", "dateUpdated": "2026-10-16T19:16:08.884Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:41:29.048Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: ax88179_178a: fix skb leak in ax88179_tx_fixup()\n\nWhen the interface has NETIF_F_SG enabled and skb_linearize() fails in\nax88179_tx_fixup(), the function returns NULL without freeing the skb.\n\nusbnet_start_xmit() treats a NULL return from tx_fixup() as a drop\n(info->flags does not set FLAG_MULTI_PACKET for this driver), jumping\nto the \"drop\" label where it does `if (skb) dev_kfree_skb_any(skb)`.\nBecause tx_fixup() returned NULL, the local skb variable in\nusbnet_start_xmit() is NULL, so the original skb is never freed — a\nmemory leak on every TX frame whose linearization fails (i.e. under\nmemory pressure).\n\nFree the skb before returning, matching the error handling already used\nfor the pskb_expand_head() failure path in the same function." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - On systems using the common ASIX AX88179/AX88178A USB 3.0 GbE adapter as their uplink, remote peers induce outbound TSO/GSO traffic that reaches ax88179_tx_fixup() via __dev_queue_xmit→netdev_start_xmit→usbnet_start_xmit; attacker-supplied or reply traffic over the bound NIC is standard network reachability.\nAC:L - NETIF_F_SG and NETIF_F_TSO are always enabled at bind; an attacker can send non-linear egress skbs and deliberately exhaust GFP_ATOMIC/slab memory so skb_linearize() fails on demand—both prerequisites are fully under attacker control without races or rare layout.\nPR:N - No capability or authentication gates the netdev TX path; any remote host exchanging IP traffic with a victim whose ax88179 interface is up can trigger usbnet_start_xmit without local shell access, credentials, or init-namespace privileges.\nUI:N - Exploitation needs only that the adapter is plugged in and carrying traffic—the normal always-on state for USB-Ethernet docks, kiosks, and laptops—not any one-time victim action such as mounting media or opening a file.\nS:U - Leaked sk_buff objects remain in kernel SLAB caches within the same kernel security authority; there is no VM escape, container breakout, IOMMU bypass, or cross-boundary corruption.\nC:N - Orphaned skbs are not freed but are not exposed to userspace or adjacent objects; there is no out-of-bounds read, use-after-free, or other disclosure primitive—only silent kernel heap consumption.\nI:N - The defect drops an skb reference on an error return without corrupting heap metadata, overwriting kernel objects, or enabling arbitrary writes or control-flow hijacking.\nA:H - Each skb_linearize() failure permanently leaks one skb; under attacker-driven memory pressure an unauthenticated remote peer can repeat TSO egress to exhaust kernel memory, provoking OOM-killer thrashing and denial of service on the host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/usb/ax88179_178a.c" ], "versions": [ { "version": "16b1c4e01c89ba07367461e0bc4cb84993c2d027", "lessThan": "83a765cbd7b4d11b0b9fa1bb9d941ae911a2159b", "status": "affected", "versionType": "git" }, { "version": "16b1c4e01c89ba07367461e0bc4cb84993c2d027", "lessThan": "1c63303659a2264bd55d9813df74cb4caeed5922", "status": "affected", "versionType": "git" }, { "version": "16b1c4e01c89ba07367461e0bc4cb84993c2d027", "lessThan": "2be5091fa693b9119ad25a8bb8c149d236a23ade", "status": "affected", "versionType": "git" }, { "version": "16b1c4e01c89ba07367461e0bc4cb84993c2d027", "lessThan": "58733b1dd46bb231d9d279c132a20ee46da1b664", "status": "affected", "versionType": "git" }, { "version": "16b1c4e01c89ba07367461e0bc4cb84993c2d027", "lessThan": "4039cd807a5a46dc5f7618fffae926b8ad8455eb", "status": "affected", "versionType": "git" }, { "version": "16b1c4e01c89ba07367461e0bc4cb84993c2d027", "lessThan": "1f428e30947395d9b9aacee03e25a4e6cfcad7a4", "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/usb/ax88179_178a.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.9", "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": "5.17", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.6.152" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.12.104" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.45" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/83a765cbd7b4d11b0b9fa1bb9d941ae911a2159b" }, { "url": "https://git.kernel.org/stable/c/1c63303659a2264bd55d9813df74cb4caeed5922" }, { "url": "https://git.kernel.org/stable/c/2be5091fa693b9119ad25a8bb8c149d236a23ade" }, { "url": "https://git.kernel.org/stable/c/58733b1dd46bb231d9d279c132a20ee46da1b664" }, { "url": "https://git.kernel.org/stable/c/4039cd807a5a46dc5f7618fffae926b8ad8455eb" }, { "url": "https://git.kernel.org/stable/c/1f428e30947395d9b9aacee03e25a4e6cfcad7a4" } ], "title": "net: usb: ax88179_178a: fix skb leak in ax88179_tx_fixup()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-74678", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:14:27.464572Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:16:08.884Z" } } ] } }