{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-53660","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-10-07T15:16:59.662Z","datePublished":"2025-10-07T15:21:20.307Z","dateUpdated":"2026-08-05T09:15:24.367Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T09:15:24.367Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, cpumap: Handle skb as well when clean up ptr_ring\n\nThe following warning was reported when running xdp_redirect_cpu with\nboth skb-mode and stress-mode enabled:\n\n  ------------[ cut here ]------------\n  Incorrect XDP memory type (-2128176192) usage\n  WARNING: CPU: 7 PID: 1442 at net/core/xdp.c:405\n  Modules linked in:\n  CPU: 7 PID: 1442 Comm: kworker/7:0 Tainted: G  6.5.0-rc2+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  Workqueue: events __cpu_map_entry_free\n  RIP: 0010:__xdp_return+0x1e4/0x4a0\n  ......\n  Call Trace:\n   <TASK>\n   ? show_regs+0x65/0x70\n   ? __warn+0xa5/0x240\n   ? __xdp_return+0x1e4/0x4a0\n   ......\n   xdp_return_frame+0x4d/0x150\n   __cpu_map_entry_free+0xf9/0x230\n   process_one_work+0x6b0/0xb80\n   worker_thread+0x96/0x720\n   kthread+0x1a5/0x1f0\n   ret_from_fork+0x3a/0x70\n   ret_from_fork_asm+0x1b/0x30\n   </TASK>\n\nThe reason for the warning is twofold. One is due to the kthread\ncpu_map_kthread_run() is stopped prematurely. Another one is\n__cpu_map_ring_cleanup() doesn't handle skb mode and treats skbs in\nptr_ring as XDP frames.\n\nPrematurely-stopped kthread will be fixed by the preceding patch and\nptr_ring will be empty when __cpu_map_ring_cleanup() is called. But\nas the comments in __cpu_map_ring_cleanup() said, handling and freeing\nskbs in ptr_ring as well to \"catch any broken behaviour gracefully\"."}],"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 - Triggering requires local BPF syscalls (cpumap creation, XDP program load, map update/delete) to set up and then tear down the cpumap entry; a purely remote attacker cannot reach `__cpu_map_ring_cleanup()`.\nAC:L - The attacker controls every side of the race — map entry create/delete timing, the CPU pressure that starves the bound cpumap kthread, and the packet injection that leaves skbs in the ptr_ring — and no rare kernel config is needed since generic (skb-mode) XDP works on any netdev.\nPR:L - Requires `bpf_capable()` plus `CAP_NET_ADMIN`, i.e. an unprivileged-but-capability-granted service account (XDP/eBPF datapath agents, container network plugins) rather than full root, matching the kernel CNA's standard treatment of BPF-subsystem flaws as low-privilege local attacks.\nUI:N - The entire sequence — map setup, XDP attach, traffic generation, map teardown — is performed by the attacker's own process with no action by any other user.\nS:U - The type confusion and the resulting memory damage stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - With the bogus HAS_FRAGS bit set, `xdp_get_shared_info_from_frame()` dereferences an address computed from misread sk_buff fields, producing an unbounded out-of-bounds read of kernel memory that is then interpreted as page pointers — an information-disclosure primitive on top of the type confusion.\nI:H - Treating an sk_buff as an xdp_frame is a type confusion in which garbage `mem.type`/`data` values steer `page_pool_put_full_page()`, `page_frag_free()`, or `put_page()` at attacker-influenced addresses, giving page-refcount corruption and premature frees that are leverageable into a write primitive.\nA:H - The path reliably produces a `WARN()` splat (a panic under the common `panic_on_warn` setting), can oops on wild dereferences or unaligned 64-bit loads, and leaks the skb and its data on every occurrence."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cpumap.c"],"versions":[{"version":"11941f8a85362f612df61f4aaab0e41b64d2111d","lessThan":"b58d34068fd9f96bfc7d389988dfaf9a92a8fe00","status":"affected","versionType":"git"},{"version":"11941f8a85362f612df61f4aaab0e41b64d2111d","lessThan":"cbd000451885801e9bbfd9cf7a7946806a85cb5e","status":"affected","versionType":"git"},{"version":"11941f8a85362f612df61f4aaab0e41b64d2111d","lessThan":"937345720d18f1ad006ba3d5dcb3fa121037b8a2","status":"affected","versionType":"git"},{"version":"11941f8a85362f612df61f4aaab0e41b64d2111d","lessThan":"7c62b75cd1a792e14b037fa4f61f9b18914e7de1","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/bpf/cpumap.c"],"versions":[{"version":"5.15","status":"affected"},{"version":"0","lessThan":"5.15","status":"unaffected","versionType":"semver"},{"version":"5.15.126","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.45","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.4.10","lessThanOrEqual":"6.4.*","status":"unaffected","versionType":"semver"},{"version":"6.5","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":"5.15","versionEndExcluding":"5.15.126"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.4.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.5"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/b58d34068fd9f96bfc7d389988dfaf9a92a8fe00"},{"url":"https://git.kernel.org/stable/c/cbd000451885801e9bbfd9cf7a7946806a85cb5e"},{"url":"https://git.kernel.org/stable/c/937345720d18f1ad006ba3d5dcb3fa121037b8a2"},{"url":"https://git.kernel.org/stable/c/7c62b75cd1a792e14b037fa4f61f9b18914e7de1"}],"title":"bpf, cpumap: Handle skb as well when clean up ptr_ring","x_generator":{"engine":"bippy-1.2.0"}}}}