{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()\n\nsyzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit()\nwhen accessing skb->len for tx statistics after usb_submit_urb() has\nbeen called:\n\n BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760\n drivers/net/usb/rtl8150.c:712\n Read of size 4 at addr ffff88810eb7a930 by task kworker/0:4/5226\n\nThe URB completion handler write_bulk_callback() frees the skb via\ndev_kfree_skb_irq(dev->tx_skb). The URB may complete on another CPU\nin softirq context before usb_submit_urb() returns in the submitter,\nso by the time the submitter reads skb->len the skb has already been\nqueued to the per-CPU completion_queue and freed by net_tx_action():\n\n CPU A (xmit) CPU B (USB completion softirq)\n ------------ ------------------------------\n dev->tx_skb = skb;\n usb_submit_urb() --+\n |-------> write_bulk_callback()\n | dev_kfree_skb_irq(dev->tx_skb)\n | net_tx_action()\n | napi_skb_cache_put() <-- free\n netdev->stats.tx_bytes |\n += skb->len; <-- UAF read\n\nFix it by caching skb->len before submitting the URB and using the\ncached value when updating the tx_bytes counter.\n\nThe pre-existing tx_bytes semantics are preserved: the counter tracks\nthe original frame length (skb->len), not the ETH_ZLEN/USB-alignment\npadded \"count\" value that is handed to the device. Changing that\nwould be a user-visible accounting change and is out of scope for\nthis UAF fix.", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52982" }, { "summary":"CVE-2026-52982 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-52982.json" }, { "summary":"openEuler-SA-2026-4039", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4039" }, { "summary":"CVE-2026-52982", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-52982&packageName=kernel" } ], "title":"openEuler cve CVE-2026-52982", "tracking":{ "initial_release_date":"2026-09-30T16:03:37+08:00", "revision_history":[ { "date":"2026-09-30T16:03:37+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-09-30T16:03:37+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-09-30T16:03:37+08:00", "id":"CVE-2026-52982", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"openEuler-22.03-LTS-SP4", "name":"openEuler-22.03-LTS-SP4" }, "name":"openEuler-22.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:22.03-LTS-SP4" }, "product_id":"bpftool-5.10.0-334.0.0.235.oe2203sp4.aarch64.rpm", "name":"bpftool-5.10.0-334.0.0.235.oe2203sp4.aarch64.rpm" }, "name":"bpftool-5.10.0-334.0.0.235.oe2203sp4.aarch64.rpm", "category":"product_version" }, { "product":{ "product_identification_helper":{ 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rtl8150_start_xmit()\n\nsyzbot reported a KASAN slab-use-after-free read in rtl8150_start_xmit()\nwhen accessing skb->len for tx statistics after usb_submit_urb() has\nbeen called:\n\n BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760\n drivers/net/usb/rtl8150.c:712\n Read of size 4 at addr ffff88810eb7a930 by task kworker/0:4/5226\n\nThe URB completion handler write_bulk_callback() frees the skb via\ndev_kfree_skb_irq(dev->tx_skb). The URB may complete on another CPU\nin softirq context before usb_submit_urb() returns in the submitter,\nso by the time the submitter reads skb->len the skb has already been\nqueued to the per-CPU completion_queue and freed by net_tx_action():\n\n CPU A (xmit) CPU B (USB completion softirq)\n ------------ ------------------------------\n dev->tx_skb = skb;\n usb_submit_urb() --+\n |-------> write_bulk_callback()\n | dev_kfree_skb_irq(dev->tx_skb)\n | net_tx_action()\n | napi_skb_cache_put() <-- free\n netdev->stats.tx_bytes |\n += skb->len; <-- UAF read\n\nFix it by caching skb->len before submitting the URB and using the\ncached value when updating the tx_bytes counter.\n\nThe pre-existing tx_bytes semantics are preserved: the counter tracks\nthe original frame length (skb->len), not the ETH_ZLEN/USB-alignment\npadded \"count\" value that is handed to the device. Changing that\nwould be a user-visible accounting change and is out of scope for\nthis UAF fix.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-22.03-LTS-SP4:bpftool-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:bpftool-debuginfo-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debuginfo-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-debugsource-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-devel-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-headers-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-source-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-5.10.0-334.0.0.235.oe2203sp4.aarch64", "openEuler-22.03-LTS-SP4:kernel-tools-debuginfo-5.10.0-334.0.0.235.oe2203sp4.aarch64", 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"openEuler-22.03-LTS-SP4:python3-perf-5.10.0-334.0.0.235.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:python3-perf-debuginfo-5.10.0-334.0.0.235.oe2203sp4.x86_64", "openEuler-22.03-LTS-SP4:kernel-5.10.0-334.0.0.235.oe2203sp4.src" ] } ], "threats":[ { "details":"Critical", "category":"impact" } ], "title":"CVE-2026-52982" } ] }