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[lts-94] vsock fixes for CVE-2025-21756 - #244
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jira VULN-53609 cve CVE-2025-21756 commit-author Michal Luczaj <mhal@rbox.co> commit fcdd224 upstream-diff Indentation is different from upstream change because this kernel lacks 135ffc7 ("bpf, vsock: Invoke proto::close on close()"). Otherwise the change content is the same. Preserve sockets bindings; this includes both resulting from an explicit bind() and those implicitly bound through autobind during connect(). Prevents socket unbinding during a transport reassignment, which fixes a use-after-free: 1. vsock_create() (refcnt=1) calls vsock_insert_unbound() (refcnt=2) 2. transport->release() calls vsock_remove_bound() without checking if sk was bound and moved to bound list (refcnt=1) 3. vsock_bind() assumes sk is in unbound list and before __vsock_insert_bound(vsock_bound_sockets()) calls __vsock_remove_bound() which does: list_del_init(&vsk->bound_table); // nop sock_put(&vsk->sk); // refcnt=0 BUG: KASAN: slab-use-after-free in __vsock_bind+0x62e/0x730 Read of size 4 at addr ffff88816b46a74c by task a.out/2057 dump_stack_lvl+0x68/0x90 print_report+0x174/0x4f6 kasan_report+0xb9/0x190 __vsock_bind+0x62e/0x730 vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Allocated by task 2057: kasan_save_stack+0x1e/0x40 kasan_save_track+0x10/0x30 __kasan_slab_alloc+0x85/0x90 kmem_cache_alloc_noprof+0x131/0x450 sk_prot_alloc+0x5b/0x220 sk_alloc+0x2c/0x870 __vsock_create.constprop.0+0x2e/0xb60 vsock_create+0xe4/0x420 __sock_create+0x241/0x650 __sys_socket+0xf2/0x1a0 __x64_sys_socket+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Freed by task 2057: kasan_save_stack+0x1e/0x40 kasan_save_track+0x10/0x30 kasan_save_free_info+0x37/0x60 __kasan_slab_free+0x4b/0x70 kmem_cache_free+0x1a1/0x590 __sk_destruct+0x388/0x5a0 __vsock_bind+0x5e1/0x730 vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e refcount_t: addition on 0; use-after-free. WARNING: CPU: 7 PID: 2057 at lib/refcount.c:25 refcount_warn_saturate+0xce/0x150 RIP: 0010:refcount_warn_saturate+0xce/0x150 __vsock_bind+0x66d/0x730 vsock_bind+0x97/0xe0 __sys_bind+0x154/0x1f0 __x64_sys_bind+0x6e/0xb0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e refcount_t: underflow; use-after-free. WARNING: CPU: 7 PID: 2057 at lib/refcount.c:28 refcount_warn_saturate+0xee/0x150 RIP: 0010:refcount_warn_saturate+0xee/0x150 vsock_remove_bound+0x187/0x1e0 __vsock_release+0x383/0x4a0 vsock_release+0x90/0x120 __sock_release+0xa3/0x250 sock_close+0x14/0x20 __fput+0x359/0xa80 task_work_run+0x107/0x1d0 do_exit+0x847/0x2560 do_group_exit+0xb8/0x250 __x64_sys_exit_group+0x3a/0x50 x64_sys_call+0xfec/0x14f0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Fixes: c0cfa2d ("vsock: add multi-transports support") Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Michal Luczaj <mhal@rbox.co> Link: https://patch.msgid.link/20250128-vsock-transport-vs-autobind-v3-1-1cf57065b770@rbox.co Signed-off-by: Jakub Kicinski <kuba@kernel.org> (cherry picked from commit fcdd224) Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>
jira VULN-53609 cve CVE-2025-21756 commit-author Michal Luczaj <mhal@rbox.co> commit 78dafe1 upstream-diff Indentation is different from upstream change because this kernel lacks 135ffc7 ("bpf, vsock: Invoke proto::close on close()"). Otherwise the change content is the same. During socket release, sock_orphan() is called without considering that it sets sk->sk_wq to NULL. Later, if SO_LINGER is enabled, this leads to a null pointer dereferenced in virtio_transport_wait_close(). Orphan the socket only after transport release. Partially reverts the 'Fixes:' commit. KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] lock_acquire+0x19e/0x500 _raw_spin_lock_irqsave+0x47/0x70 add_wait_queue+0x46/0x230 virtio_transport_release+0x4e7/0x7f0 __vsock_release+0xfd/0x490 vsock_release+0x90/0x120 __sock_release+0xa3/0x250 sock_close+0x14/0x20 __fput+0x35e/0xa90 __x64_sys_close+0x78/0xd0 do_syscall_64+0x93/0x1b0 entry_SYSCALL_64_after_hwframe+0x76/0x7e Reported-by: syzbot+9d55b199192a4be7d02c@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=9d55b199192a4be7d02c Fixes: fcdd224 ("vsock: Keep the binding until socket destruction") Tested-by: Luigi Leonardi <leonardi@redhat.com> Reviewed-by: Luigi Leonardi <leonardi@redhat.com> Signed-off-by: Michal Luczaj <mhal@rbox.co> Link: https://patch.msgid.link/20250210-vsock-linger-nullderef-v3-1-ef6244d02b54@rbox.co Signed-off-by: Jakub Kicinski <kuba@kernel.org> (cherry picked from commit 78dafe1) Signed-off-by: Brett Mastbergen <bmastbergen@ciq.com>
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jira LE-1907 Rebuild_History Non-Buildable kernel-5.14.0-427.18.1.el9_4 commit-author Daniel Borkmann <daniel@iogearbox.net> commit cd13c91 Add a big batch of test coverage to assert all aspects of the tcx opts attach, detach and query API: # ./vmtest.sh -- ./test_progs -t tc_opts [...] ctrliq#238 tc_opts_after:OK ctrliq#239 tc_opts_append:OK ctrliq#240 tc_opts_basic:OK ctrliq#241 tc_opts_before:OK ctrliq#242 tc_opts_chain_classic:OK ctrliq#243 tc_opts_demixed:OK ctrliq#244 tc_opts_detach:OK ctrliq#245 tc_opts_detach_after:OK ctrliq#246 tc_opts_detach_before:OK ctrliq#247 tc_opts_dev_cleanup:OK ctrliq#248 tc_opts_invalid:OK ctrliq#249 tc_opts_mixed:OK ctrliq#250 tc_opts_prepend:OK ctrliq#251 tc_opts_replace:OK ctrliq#252 tc_opts_revision:OK Summary: 15/0 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/r/20230719140858.13224-8-daniel@iogearbox.net Signed-off-by: Alexei Starovoitov <ast@kernel.org> (cherry picked from commit cd13c91) Signed-off-by: Jonathan Maple <jmaple@ciq.com>
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Aug 29, 2025
jira LE-1907 Rebuild_History Non-Buildable kernel-5.14.0-427.18.1.el9_4 commit-author Daniel Borkmann <daniel@iogearbox.net> commit 21ce6ab Add a detachment test case with miniq present to assert that with and without the miniq we get the same error. # ./test_progs -t tc_opts ctrliq#244 tc_opts_after:OK ctrliq#245 tc_opts_append:OK ctrliq#246 tc_opts_basic:OK ctrliq#247 tc_opts_before:OK ctrliq#248 tc_opts_chain_classic:OK ctrliq#249 tc_opts_delete_empty:OK ctrliq#250 tc_opts_demixed:OK ctrliq#251 tc_opts_detach:OK ctrliq#252 tc_opts_detach_after:OK ctrliq#253 tc_opts_detach_before:OK ctrliq#254 tc_opts_dev_cleanup:OK ctrliq#255 tc_opts_invalid:OK ctrliq#256 tc_opts_mixed:OK ctrliq#257 tc_opts_prepend:OK ctrliq#258 tc_opts_replace:OK ctrliq#259 tc_opts_revision:OK Summary: 16/0 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/r/20230804131112.11012-2-daniel@iogearbox.net Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> (cherry picked from commit 21ce6ab) Signed-off-by: Jonathan Maple <jmaple@ciq.com>
bmastbergen pushed a commit
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Aug 29, 2025
jira LE-1907 Rebuild_History Non-Buildable kernel-5.14.0-427.18.1.el9_4 commit-author Daniel Borkmann <daniel@iogearbox.net> commit ccd9a8b Add several new tcx test cases to improve test coverage. This also includes a few new tests with ingress instead of clsact qdisc, to cover the fix from commit dc644b5 ("tcx: Fix splat in ingress_destroy upon tcx_entry_free"). # ./test_progs -t tc [...] ctrliq#234 tc_links_after:OK ctrliq#235 tc_links_append:OK ctrliq#236 tc_links_basic:OK ctrliq#237 tc_links_before:OK ctrliq#238 tc_links_chain_classic:OK ctrliq#239 tc_links_chain_mixed:OK ctrliq#240 tc_links_dev_cleanup:OK ctrliq#241 tc_links_dev_mixed:OK ctrliq#242 tc_links_ingress:OK ctrliq#243 tc_links_invalid:OK ctrliq#244 tc_links_prepend:OK ctrliq#245 tc_links_replace:OK ctrliq#246 tc_links_revision:OK ctrliq#247 tc_opts_after:OK ctrliq#248 tc_opts_append:OK ctrliq#249 tc_opts_basic:OK ctrliq#250 tc_opts_before:OK ctrliq#251 tc_opts_chain_classic:OK ctrliq#252 tc_opts_chain_mixed:OK ctrliq#253 tc_opts_delete_empty:OK ctrliq#254 tc_opts_demixed:OK ctrliq#255 tc_opts_detach:OK ctrliq#256 tc_opts_detach_after:OK ctrliq#257 tc_opts_detach_before:OK ctrliq#258 tc_opts_dev_cleanup:OK ctrliq#259 tc_opts_invalid:OK ctrliq#260 tc_opts_mixed:OK ctrliq#261 tc_opts_prepend:OK ctrliq#262 tc_opts_replace:OK ctrliq#263 tc_opts_revision:OK [...] Summary: 44/38 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/r/8699efc284b75ccdc51ddf7062fa2370330dc6c0.1692029283.git.daniel@iogearbox.net Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> (cherry picked from commit ccd9a8b) Signed-off-by: Jonathan Maple <jmaple@ciq.com>
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VULN-53609
CVE-2025-21756
This ended up being two commits: The initial fix and a fix for that fix.
Build Log
Testing
kselfests were run before and after applying the fixes
selftests-5.14.0-427.42.1.el9_4.94ciq_lts.2.1.x86_64.log
selftests-5.14.0-bmastbergen_ciqlts9_4_VULN-53609-9547bbd702bc+.log