{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53107", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-05-02T15:51:43.553Z", "datePublished": "2025-05-02T15:55:48.206Z", "dateUpdated": "2026-08-05T09:12:48.850Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:12:48.850Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nveth: Fix use after free in XDP_REDIRECT\n\nCommit 718a18a0c8a6 (\"veth: Rework veth_xdp_rcv_skb in order\nto accept non-linear skb\") introduced a bug where it tried to\nuse pskb_expand_head() if the headroom was less than\nXDP_PACKET_HEADROOM. This however uses kmalloc to expand the head,\nwhich will later allow consume_skb() to free the skb while is it still\nin use by AF_XDP.\n\nPreviously if the headroom was less than XDP_PACKET_HEADROOM we\ncontinued on to allocate a new skb from pages so this restores that\nbehavior.\n\nBUG: KASAN: use-after-free in __xsk_rcv+0x18d/0x2c0\nRead of size 78 at addr ffff888976250154 by task napi/iconduit-g/148640\n\nCPU: 5 PID: 148640 Comm: napi/iconduit-g Kdump: loaded Tainted: G O 6.1.4-cloudflare-kasan-2023.1.2 #1\nHardware name: Quanta Computer Inc. QuantaPlex T41S-2U/S2S-MB, BIOS S2S_3B10.03 06/21/2018\nCall Trace:\n \n dump_stack_lvl+0x34/0x48\n print_report+0x170/0x473\n ? __xsk_rcv+0x18d/0x2c0\n kasan_report+0xad/0x130\n ? __xsk_rcv+0x18d/0x2c0\n kasan_check_range+0x149/0x1a0\n memcpy+0x20/0x60\n __xsk_rcv+0x18d/0x2c0\n __xsk_map_redirect+0x1f3/0x490\n ? veth_xdp_rcv_skb+0x89c/0x1ba0 [veth]\n xdp_do_redirect+0x5ca/0xd60\n veth_xdp_rcv_skb+0x935/0x1ba0 [veth]\n ? __netif_receive_skb_list_core+0x671/0x920\n ? veth_xdp+0x670/0x670 [veth]\n veth_xdp_rcv+0x304/0xa20 [veth]\n ? do_xdp_generic+0x150/0x150\n ? veth_xdp_rcv_one+0xde0/0xde0 [veth]\n ? _raw_spin_lock_bh+0xe0/0xe0\n ? newidle_balance+0x887/0xe30\n ? __perf_event_task_sched_in+0xdb/0x800\n veth_poll+0x139/0x571 [veth]\n ? veth_xdp_rcv+0xa20/0xa20 [veth]\n ? _raw_spin_unlock+0x39/0x70\n ? finish_task_switch.isra.0+0x17e/0x7d0\n ? __switch_to+0x5cf/0x1070\n ? __schedule+0x95b/0x2640\n ? io_schedule_timeout+0x160/0x160\n __napi_poll+0xa1/0x440\n napi_threaded_poll+0x3d1/0x460\n ? __napi_poll+0x440/0x440\n ? __kthread_parkme+0xc6/0x1f0\n ? __napi_poll+0x440/0x440\n kthread+0x2a2/0x340\n ? kthread_complete_and_exit+0x20/0x20\n ret_from_fork+0x22/0x30\n \n\nFreed by task 148640:\n kasan_save_stack+0x23/0x50\n kasan_set_track+0x21/0x30\n kasan_save_free_info+0x2a/0x40\n ____kasan_slab_free+0x169/0x1d0\n slab_free_freelist_hook+0xd2/0x190\n __kmem_cache_free+0x1a1/0x2f0\n skb_release_data+0x449/0x600\n consume_skb+0x9f/0x1c0\n veth_xdp_rcv_skb+0x89c/0x1ba0 [veth]\n veth_xdp_rcv+0x304/0xa20 [veth]\n veth_poll+0x139/0x571 [veth]\n __napi_poll+0xa1/0x440\n napi_threaded_poll+0x3d1/0x460\n kthread+0x2a2/0x340\n ret_from_fork+0x22/0x30\n\nThe buggy address belongs to the object at ffff888976250000\n which belongs to the cache kmalloc-2k of size 2048\nThe buggy address is located 340 bytes inside of\n 2048-byte region [ffff888976250000, ffff888976250800)\n\nThe buggy address belongs to the physical page:\npage:00000000ae18262a refcount:2 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x976250\nhead:00000000ae18262a order:3 compound_mapcount:0 compound_pincount:0\nflags: 0x2ffff800010200(slab|head|node=0|zone=2|lastcpupid=0x1ffff)\nraw: 002ffff800010200 0000000000000000 dead000000000122 ffff88810004cf00\nraw: 0000000000000000 0000000080080008 00000002ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff888976250000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888976250080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n> ffff888976250100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ^\n ffff888976250180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888976250200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb" } ], "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 bug is in veth's XDP receive path (veth_xmit → xdp_ring → veth_xdp_rcv_skb → XDP_REDIRECT), reached by transmitting on the peer veth, not by parsing remote protocol data on the wire. Triggering it requires local access to a namespace/interface that can xmit into that peer.\nAC:L - Once an XDP_REDIRECT program is attached on veth (a common production setup), the attacker only needs to cause peer transmits that yield a linear page-frag skb with headroom < XDP_PACKET_HEADROOM; that layout occurs in normal forwarding/NIC paths and does not depend on an attacker-uncontrollable race.\nPR:L - Attaching XDP needs CAP_BPF/CAP_NET_ADMIN, but the worst reasonable case is an already-configured host (e.g. Cloudflare-style AF_XDP on veth) where an unprivileged local/container user can send on the peer and hit the UAF. Creating veth itself is also reachable with CAP_NET_ADMIN via user namespaces.\nUI:N - No victim action is required; the attacker triggers the path by sending packets through the veth peer once XDP_REDIRECT is present.\nS:U - This is host-kernel memory corruption in the veth/XDP path and does not cross a VM, IOMMU, or other separate security authority.\nC:H - The UAF frees a kmalloc-backed skb head while AF_XDP still memcpy's from it in __xsk_rcv, exposing reallocated slab contents to userspace; bogus get_page() on slab memory further enables broader read primitives via page lifetime corruption.\nI:H - Use-after-free of the skb head plus incorrect page refcounting on slab pages can be turned into heap spray / arbitrary write and control-flow hijack in the kernel.\nA:H - The UAF reliably causes kernel KASAN reports, oopses, or panics even without full exploitation, as shown by the reported crash in __xsk_rcv." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/veth.c" ], "versions": [ { "version": "718a18a0c8a67f97781e40bdef7cdd055c430996", "lessThan": "717d20710596b5b26595ede454d1105fa176f4a4", "status": "affected", "versionType": "git" }, { "version": "718a18a0c8a67f97781e40bdef7cdd055c430996", "lessThan": "6e755b56896df48b0fae0db275e148f8d8aa7d6f", "status": "affected", "versionType": "git" }, { "version": "718a18a0c8a67f97781e40bdef7cdd055c430996", "lessThan": "7c10131803e45269ddc6c817f19ed649110f3cae", "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/veth.c" ], "versions": [ { "version": "5.18", "status": "affected" }, { "version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.21", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2.8", "lessThanOrEqual": "6.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3", "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": "5.18", "versionEndExcluding": "6.1.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/717d20710596b5b26595ede454d1105fa176f4a4" }, { "url": "https://git.kernel.org/stable/c/6e755b56896df48b0fae0db275e148f8d8aa7d6f" }, { "url": "https://git.kernel.org/stable/c/7c10131803e45269ddc6c817f19ed649110f3cae" } ], "title": "veth: Fix use after free in XDP_REDIRECT", "x_generator": { "engine": "bippy-1.2.0" } } } }