{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31396", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.085Z", "datePublished": "2026-04-03T15:16:00.579Z", "dateUpdated": "2026-08-05T12:22:05.900Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:22:05.900Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: macb: fix use-after-free access to PTP clock\n\nPTP clock is registered on every opening of the interface and destroyed on\nevery closing. However it may be accessed via get_ts_info ethtool call\nwhich is possible while the interface is just present in the kernel.\n\nBUG: KASAN: use-after-free in ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426\nRead of size 4 at addr ffff8880194345cc by task syz.0.6/948\n\nCPU: 1 PID: 948 Comm: syz.0.6 Not tainted 6.1.164+ #109\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.1-0-g3208b098f51a-prebuilt.qemu.org 04/01/2014\nCall Trace:\n \n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x8d/0xba lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:316 [inline]\n print_report+0x17f/0x496 mm/kasan/report.c:420\n kasan_report+0xd9/0x180 mm/kasan/report.c:524\n ptp_clock_index+0x47/0x50 drivers/ptp/ptp_clock.c:426\n gem_get_ts_info+0x138/0x1e0 drivers/net/ethernet/cadence/macb_main.c:3349\n macb_get_ts_info+0x68/0xb0 drivers/net/ethernet/cadence/macb_main.c:3371\n __ethtool_get_ts_info+0x17c/0x260 net/ethtool/common.c:558\n ethtool_get_ts_info net/ethtool/ioctl.c:2367 [inline]\n __dev_ethtool net/ethtool/ioctl.c:3017 [inline]\n dev_ethtool+0x2b05/0x6290 net/ethtool/ioctl.c:3095\n dev_ioctl+0x637/0x1070 net/core/dev_ioctl.c:510\n sock_do_ioctl+0x20d/0x2c0 net/socket.c:1215\n sock_ioctl+0x577/0x6d0 net/socket.c:1320\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:870 [inline]\n __se_sys_ioctl fs/ioctl.c:856 [inline]\n __x64_sys_ioctl+0x18c/0x210 fs/ioctl.c:856\n do_syscall_x64 arch/x86/entry/common.c:46 [inline]\n do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n \n\nAllocated by task 457:\n kmalloc include/linux/slab.h:563 [inline]\n kzalloc include/linux/slab.h:699 [inline]\n ptp_clock_register+0x144/0x10e0 drivers/ptp/ptp_clock.c:235\n gem_ptp_init+0x46f/0x930 drivers/net/ethernet/cadence/macb_ptp.c:375\n macb_open+0x901/0xd10 drivers/net/ethernet/cadence/macb_main.c:2920\n __dev_open+0x2ce/0x500 net/core/dev.c:1501\n __dev_change_flags+0x56a/0x740 net/core/dev.c:8651\n dev_change_flags+0x92/0x170 net/core/dev.c:8722\n do_setlink+0xaf8/0x3a80 net/core/rtnetlink.c:2833\n __rtnl_newlink+0xbf4/0x1940 net/core/rtnetlink.c:3608\n rtnl_newlink+0x63/0xa0 net/core/rtnetlink.c:3655\n rtnetlink_rcv_msg+0x3c6/0xed0 net/core/rtnetlink.c:6150\n netlink_rcv_skb+0x15d/0x430 net/netlink/af_netlink.c:2511\n netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n netlink_unicast+0x6d7/0xa30 net/netlink/af_netlink.c:1344\n netlink_sendmsg+0x97e/0xeb0 net/netlink/af_netlink.c:1872\n sock_sendmsg_nosec net/socket.c:718 [inline]\n __sock_sendmsg+0x14b/0x180 net/socket.c:730\n __sys_sendto+0x320/0x3b0 net/socket.c:2152\n __do_sys_sendto net/socket.c:2164 [inline]\n __se_sys_sendto net/socket.c:2160 [inline]\n __x64_sys_sendto+0xdc/0x1b0 net/socket.c:2160\n do_syscall_x64 arch/x86/entry/common.c:46 [inline]\n do_syscall_64+0x35/0x80 arch/x86/entry/common.c:76\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nFreed by task 938:\n kasan_slab_free include/linux/kasan.h:177 [inline]\n slab_free_hook mm/slub.c:1729 [inline]\n slab_free_freelist_hook mm/slub.c:1755 [inline]\n slab_free mm/slub.c:3687 [inline]\n __kmem_cache_free+0xbc/0x320 mm/slub.c:3700\n device_release+0xa0/0x240 drivers/base/core.c:2507\n kobject_cleanup lib/kobject.c:681 [inline]\n kobject_release lib/kobject.c:712 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x1cd/0x350 lib/kobject.c:729\n put_device+0x1b/0x30 drivers/base/core.c:3805\n ptp_clock_unregister+0x171/0x270 drivers/ptp/ptp_clock.c:391\n gem_ptp_remove+0x4e/0x1f0 drivers/net/ethernet/cadence/macb_ptp.c:404\n macb_close+0x1c8/0x270 drivers/net/ethernet/cadence/macb_main.c:2966\n __dev_close_many+0x1b9/0x310 net/core/dev.c:1585\n __dev_close net/core/dev.c:1597 [inline]\n __dev_change_flags+0x2bb/0x740 net/core/dev.c:8649\n dev_change_fl\n---truncated---" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable dereference is reached through local ethtool timestamp-info requests, not through received Ethernet/PTP packets. Network traffic alone does not enter gem_get_ts_info().\nAC:L - No attacker-uncontrolled race is required; once interface open/close leaves a stale PTP clock pointer, a timestamp-info query deterministically dereferences it. The trigger can be repeated while the stale pointer remains.\nPR:L - A basic local user can issue the ETHTOOL_GET_TS_INFO query path, which ethtool explicitly allows without CAP_NET_ADMIN. Interface cycling is privileged, but the stale state can exist after normal system management, so the higher-severity defensible choice is PR:L.\nUI:N - No victim action is required after the affected macb/GEM interface exists in the vulnerable state. The attacker invokes the local query directly.\nS:U - The bug is in a kernel network driver and impacts the same kernel security authority. It is not a guest-to-host, IOMMU, or other cross-scope boundary bypass.\nC:H - This is a kernel heap use-after-free of struct ptp_clock reached through a stale driver pointer. Under the kernel scoring guidance, UAFs are treated as high confidentiality impact because freed object reuse can enable memory disclosure primitives.\nI:H - Although the observed crash path is a stale read of the PTP clock index, the underlying bug is a kernel heap UAF. Under the required kernel guidance, UAFs are scored as high integrity impact because heap reuse can be leveraged toward control-flow or write primitives.\nA:H - The reported KASAN trace shows a use-after-free in ptp_clock_index(), and such kernel UAFs can cause oops/panic or repeated system crashes. Availability impact is therefore high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/cadence/macb_ptp.c" ], "versions": [ { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "8820ffe0975fd2efbe50453e9179c8e1c33a13d3", "status": "affected", "versionType": "git" }, { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "6b757f345eeea87ed5d8afd6de35b927a1a57a2f", "status": "affected", "versionType": "git" }, { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "341d01087f821aa0f165fb1ffc8bfe4e50776da7", "status": "affected", "versionType": "git" }, { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "5653af416a48f6c18f9626ae9df96f814f45ff34", "status": "affected", "versionType": "git" }, { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "0bb848d8c64938024e45780f8032f1f67d3a3607", "status": "affected", "versionType": "git" }, { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "1f4714065b2bcbb0a4013fd355b84b848e6cc345", "status": "affected", "versionType": "git" }, { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "eb652535e9ec795ef5c1078f7578eaaed755268b", "status": "affected", "versionType": "git" }, { "version": "c2594d804d5c8033861d44840673d852d98508c1", "lessThan": "8da13e6d63c1a97f7302d342c89c4a56a55c7015", "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/ethernet/cadence/macb_ptp.c" ], "versions": [ { "version": "4.11", "status": "affected" }, { "version": "0", "lessThan": "4.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.253", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.167", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.130", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.78", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "4.11", "versionEndExcluding": "5.10.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.1.167" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.6.130" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.12.78" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.18.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "6.19.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.11", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8820ffe0975fd2efbe50453e9179c8e1c33a13d3" }, { "url": "https://git.kernel.org/stable/c/6b757f345eeea87ed5d8afd6de35b927a1a57a2f" }, { "url": "https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7" }, { "url": "https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34" }, { "url": "https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607" }, { "url": "https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345" }, { "url": "https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b" }, { "url": "https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015" } ], "title": "net: macb: fix use-after-free access to PTP clock", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-07-14T12:47:26.600Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.6", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" }, { "vendor": "Siemens", "product": "SIPLUS S7-1500 CPU 1518-4 PN/DP MFP", "versions": [ { "status": "affected", "version": "V3.1.5", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html" }, { "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html" } ] } ] } }