{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-38019", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-38019", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-06-18T09:28:27.046Z", "updatedAt": "2026-05-11T21:19:44.660Z", "importedAt": "2026-10-24T01:57:34.152Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "mlxsw: spectrum_router: Fix use-after-free when deleting GRE net devices", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_router: Fix use-after-free when deleting GRE net devices\n\nThe driver only offloads neighbors that are constructed on top of net\ndevices registered by it or their uppers (which are all Ethernet). The\ndevice supports GRE encapsulation and decapsulation of forwarded\ntraffic, but the driver will not offload dummy neighbors constructed on\ntop of GRE net devices as they are not uppers of its net devices:\n\n # ip link add name gre1 up type gre tos inherit local 192.0.2.1 remote 198.51.100.1\n # ip neigh add 0.0.0.0 lladdr 0.0.0.0 nud noarp dev gre1\n $ ip neigh show dev gre1 nud noarp\n 0.0.0.0 lladdr 0.0.0.0 NOARP\n\n(Note that the neighbor is not marked with 'offload')\n\nWhen the driver is reloaded and the existing configuration is replayed,\nthe driver does not perform the same check regarding existing neighbors\nand offloads the previously added one:\n\n # devlink dev reload pci/0000:01:00.0\n $ ip neigh show dev gre1 nud noarp\n 0.0.0.0 lladdr 0.0.0.0 offload NOARP\n\nIf the neighbor is later deleted, the driver will ignore the\nnotification (given the GRE net device is not its upper) and will\ntherefore keep referencing freed memory, resulting in a use-after-free\n[1] when the net device is deleted:\n\n # ip neigh del 0.0.0.0 lladdr 0.0.0.0 dev gre1\n # ip link del dev gre1\n\nFix by skipping neighbor replay if the net device for which the replay\nis performed is not our upper.\n\n[1]\nBUG: KASAN: slab-use-after-free in mlxsw_sp_neigh_entry_update+0x1ea/0x200\nRead of size 8 at addr ffff888155b0e420 by task ip/2282\n[...]\nCall Trace:\n \n dump_stack_lvl+0x6f/0xa0\n print_address_description.constprop.0+0x6f/0x350\n print_report+0x108/0x205\n kasan_report+0xdf/0x110\n mlxsw_sp_neigh_entry_update+0x1ea/0x200\n mlxsw_sp_router_rif_gone_sync+0x2a8/0x440\n mlxsw_sp_rif_destroy+0x1e9/0x750\n mlxsw_sp_netdevice_ipip_ol_event+0x3c9/0xdc0\n mlxsw_sp_router_netdevice_event+0x3ac/0x15e0\n notifier_call_chain+0xca/0x150\n call_netdevice_notifiers_info+0x7f/0x100\n unregister_netdevice_many_notify+0xc8c/0x1d90\n rtnl_dellink+0x34e/0xa50\n rtnetlink_rcv_msg+0x6fb/0xb70\n netlink_rcv_skb+0x131/0x360\n netlink_unicast+0x426/0x710\n netlink_sendmsg+0x75a/0xc20\n __sock_sendmsg+0xc1/0x150\n ____sys_sendmsg+0x5aa/0x7b0\n ___sys_sendmsg+0xfc/0x180\n __sys_sendmsg+0x121/0x1b0\n do_syscall_64+0xbb/0x1d0\n entry_SYSCALL_64_after_hwframe+0x4b/0x53", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0", "status": "affected", "versionType": "git", "lessThan": "f1ecccb5cdda39bca8cd17bb0b6cf61361e33578" }, { "version": "8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0", "status": "affected", "versionType": "git", "lessThan": "abc43c1ffdbc801b0b04ac845bfaf1d42b8f68f7" }, { "version": "8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0", "status": "affected", "versionType": "git", "lessThan": "9ab7945f3a61ed23da412e30f1e56414c05c4f06" }, { "version": "8fdb09a7674c61c4f0e5faf0d63b3ce500a341b0", "status": "affected", "versionType": "git", "lessThan": "92ec4855034b2c4d13f117558dc73d20581fa9ff" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.6" }, { "version": "6.6.92", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.30", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.14.8", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.14.*" }, { "version": "6.15", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }