{"id":"CVE-2026-53094","summary":"bpf: Fix stale offload-\u003eprog pointer after constant blinding","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix stale offload-\u003eprog pointer after constant blinding\n\nWhen a dev-bound-only BPF program (BPF_F_XDP_DEV_BOUND_ONLY) undergoes\nJIT compilation with constant blinding enabled (bpf_jit_harden \u003e= 2),\nbpf_jit_blind_constants() clones the program. The original prog is then\nfreed in bpf_jit_prog_release_other(), which updates aux-\u003eprog to point\nto the surviving clone, but fails to update offload-\u003eprog.\n\nThis leaves offload-\u003eprog pointing to the freed original program. When\nthe network namespace is subsequently destroyed, cleanup_net() triggers\nbpf_dev_bound_netdev_unregister(), which iterates ondev-\u003eprogs and calls\n__bpf_prog_offload_destroy(offload-\u003eprog). Accessing the freed prog\ncauses a page fault:\n\nBUG: unable to handle page fault for address: ffffc900085f1038\nWorkqueue: netns cleanup_net\nRIP: 0010:__bpf_prog_offload_destroy+0xc/0x80\nCall Trace:\n__bpf_offload_dev_netdev_unregister+0x257/0x350\nbpf_dev_bound_netdev_unregister+0x4a/0x90\nunregister_netdevice_many_notify+0x2a2/0x660\n...\ncleanup_net+0x21a/0x320\n\nThe test sequence that triggers this reliably is:\n\n1. Set net.core.bpf_jit_harden=2 (echo 2 \u003e /proc/sys/net/core/bpf_jit_harden)\n2. Run xdp_metadata selftest, which creates a dev-bound-only XDP\n   program on a veth inside a netns (./test_progs -t xdp_metadata)\n3. cleanup_net -\u003e page fault in __bpf_prog_offload_destroy\n\nDev-bound-only programs are unique in that they have an offload structure\nbut go through the normal JIT path instead of bpf_prog_offload_compile().\nThis means they are subject to constant blinding's prog clone-and-replace,\nwhile also having offload-\u003eprog that must stay in sync.\n\nFix this by updating offload-\u003eprog in bpf_jit_prog_release_other(),\nalongside the existing aux-\u003eprog update. Both are back-pointers to\nthe prog that must be kept in sync when the prog is replaced.","modified":"2026-07-16T03:30:57.617000968Z","published":"2026-06-24T16:30:32.815Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53094.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/059525cf18e69a9313baf947d8898c6ee7ca6b65"},{"type":"WEB","url":"https://git.kernel.org/stable/c/25484c39d1ec82a0368798d956da3de5039b3fe8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1aa9ef47c299c5bbc30594d3c2f0589edf908e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a713b72ff88cdab4d5d692908ab1259ada511f4d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c79f8503d83d4665be461fb9e45e215d0380c67b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53094.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53094"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2b3486bc2d237ec345b3942b7be5deabf8c8fed1"},{"fixed":"a713b72ff88cdab4d5d692908ab1259ada511f4d"},{"fixed":"25484c39d1ec82a0368798d956da3de5039b3fe8"},{"fixed":"059525cf18e69a9313baf947d8898c6ee7ca6b65"},{"fixed":"c79f8503d83d4665be461fb9e45e215d0380c67b"},{"fixed":"a1aa9ef47c299c5bbc30594d3c2f0589edf908e6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53094.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.3.0"},{"fixed":"6.6.141"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53094.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}