CVE-2021-47300 (GCVE-0-2021-47300)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:51
VLAI
Title
bpf: Fix tail_call_reachable rejection for interpreter when jit failed
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix tail_call_reachable rejection for interpreter when jit failed During testing of f263a81451c1 ("bpf: Track subprog poke descriptors correctly and fix use-after-free") under various failure conditions, for example, when jit_subprogs() fails and tries to clean up the program to be run under the interpreter, we ran into the following freeze: [...] #127/8 tailcall_bpf2bpf_3:FAIL [...] [ 92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20 [ 92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682 [ 92.043707] [ 92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G O 5.13.0-53301-ge6c08cb33a30-dirty #87 [ 92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014 [ 92.046785] Call Trace: [ 92.047171] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.047773] ? __bpf_prog_run_args32+0x8b/0xb0 [ 92.048389] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.049019] ? ktime_get+0x117/0x130 [...] // few hundred [similar] lines more [ 92.659025] ? ktime_get+0x117/0x130 [ 92.659845] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.660738] ? __bpf_prog_run_args32+0x8b/0xb0 [ 92.661528] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.662378] ? print_usage_bug+0x50/0x50 [ 92.663221] ? print_usage_bug+0x50/0x50 [ 92.664077] ? bpf_ksym_find+0x9c/0xe0 [ 92.664887] ? ktime_get+0x117/0x130 [ 92.665624] ? kernel_text_address+0xf5/0x100 [ 92.666529] ? __kernel_text_address+0xe/0x30 [ 92.667725] ? unwind_get_return_address+0x2f/0x50 [ 92.668854] ? ___bpf_prog_run+0x15d4/0x2e20 [ 92.670185] ? ktime_get+0x117/0x130 [ 92.671130] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.672020] ? __bpf_prog_run_args32+0x8b/0xb0 [ 92.672860] ? __bpf_prog_run_args64+0xc0/0xc0 [ 92.675159] ? ktime_get+0x117/0x130 [ 92.677074] ? lock_is_held_type+0xd5/0x130 [ 92.678662] ? ___bpf_prog_run+0x15d4/0x2e20 [ 92.680046] ? ktime_get+0x117/0x130 [ 92.681285] ? __bpf_prog_run32+0x6b/0x90 [ 92.682601] ? __bpf_prog_run64+0x90/0x90 [ 92.683636] ? lock_downgrade+0x370/0x370 [ 92.684647] ? mark_held_locks+0x44/0x90 [ 92.685652] ? ktime_get+0x117/0x130 [ 92.686752] ? lockdep_hardirqs_on+0x79/0x100 [ 92.688004] ? ktime_get+0x117/0x130 [ 92.688573] ? __cant_migrate+0x2b/0x80 [ 92.689192] ? bpf_test_run+0x2f4/0x510 [ 92.689869] ? bpf_test_timer_continue+0x1c0/0x1c0 [ 92.690856] ? rcu_read_lock_bh_held+0x90/0x90 [ 92.691506] ? __kasan_slab_alloc+0x61/0x80 [ 92.692128] ? eth_type_trans+0x128/0x240 [ 92.692737] ? __build_skb+0x46/0x50 [ 92.693252] ? bpf_prog_test_run_skb+0x65e/0xc50 [ 92.693954] ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0 [ 92.694639] ? __fget_light+0xa1/0x100 [ 92.695162] ? bpf_prog_inc+0x23/0x30 [ 92.695685] ? __sys_bpf+0xb40/0x2c80 [ 92.696324] ? bpf_link_get_from_fd+0x90/0x90 [ 92.697150] ? mark_held_locks+0x24/0x90 [ 92.698007] ? lockdep_hardirqs_on_prepare+0x124/0x220 [ 92.699045] ? finish_task_switch+0xe6/0x370 [ 92.700072] ? lockdep_hardirqs_on+0x79/0x100 [ 92.701233] ? finish_task_switch+0x11d/0x370 [ 92.702264] ? __switch_to+0x2c0/0x740 [ 92.703148] ? mark_held_locks+0x24/0x90 [ 92.704155] ? __x64_sys_bpf+0x45/0x50 [ 92.705146] ? do_syscall_64+0x35/0x80 [ 92.706953] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [...] Turns out that the program rejection from e411901c0b77 ("bpf: allow for tailcalls in BPF subprograms for x64 JIT") is buggy since env->prog->aux->tail_call_reachable is never true. Commit ebf7d1f508a7 ("bpf, x64: rework pro/epilogue and tailcall handling in JIT") added a tracker into check_max_stack_depth() which propagates the tail_call_reachable condition throughout the subprograms. This info is then assigned to the subprogram's ---truncated---
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ebf7d1f508a73871acf3b2bfbfa1323a477acdb3 , < 39f1735c8107ef43a53c4daf82f330d880488d8f (git)
Affected: ebf7d1f508a73871acf3b2bfbfa1323a477acdb3 , < cbb086074dab631ac43f8645cbac1d7b148e05c4 (git)
Affected: ebf7d1f508a73871acf3b2bfbfa1323a477acdb3 , < 5dd0a6b8582ffbfa88351949d50eccd5b6694ade (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.54 , ≤ 5.10.* (semver)
Unaffected: 5.13.6 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix tail_call_reachable rejection for interpreter when jit failed\n\nDuring testing of f263a81451c1 (\"bpf: Track subprog poke descriptors correctly\nand fix use-after-free\") under various failure conditions, for example, when\njit_subprogs() fails and tries to clean up the program to be run under the\ninterpreter, we ran into the following freeze:\n\n  [...]\n  #127/8 tailcall_bpf2bpf_3:FAIL\n  [...]\n  [   92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20\n  [   92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682\n  [   92.043707]\n  [   92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G   O   5.13.0-53301-ge6c08cb33a30-dirty #87\n  [   92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\n  [   92.046785] Call Trace:\n  [   92.047171]  ? __bpf_prog_run_args64+0xc0/0xc0\n  [   92.047773]  ? __bpf_prog_run_args32+0x8b/0xb0\n  [   92.048389]  ? __bpf_prog_run_args64+0xc0/0xc0\n  [   92.049019]  ? ktime_get+0x117/0x130\n  [...] // few hundred [similar] lines more\n  [   92.659025]  ? ktime_get+0x117/0x130\n  [   92.659845]  ? __bpf_prog_run_args64+0xc0/0xc0\n  [   92.660738]  ? __bpf_prog_run_args32+0x8b/0xb0\n  [   92.661528]  ? __bpf_prog_run_args64+0xc0/0xc0\n  [   92.662378]  ? print_usage_bug+0x50/0x50\n  [   92.663221]  ? print_usage_bug+0x50/0x50\n  [   92.664077]  ? bpf_ksym_find+0x9c/0xe0\n  [   92.664887]  ? ktime_get+0x117/0x130\n  [   92.665624]  ? kernel_text_address+0xf5/0x100\n  [   92.666529]  ? __kernel_text_address+0xe/0x30\n  [   92.667725]  ? unwind_get_return_address+0x2f/0x50\n  [   92.668854]  ? ___bpf_prog_run+0x15d4/0x2e20\n  [   92.670185]  ? ktime_get+0x117/0x130\n  [   92.671130]  ? __bpf_prog_run_args64+0xc0/0xc0\n  [   92.672020]  ? __bpf_prog_run_args32+0x8b/0xb0\n  [   92.672860]  ? __bpf_prog_run_args64+0xc0/0xc0\n  [   92.675159]  ? ktime_get+0x117/0x130\n  [   92.677074]  ? lock_is_held_type+0xd5/0x130\n  [   92.678662]  ? ___bpf_prog_run+0x15d4/0x2e20\n  [   92.680046]  ? ktime_get+0x117/0x130\n  [   92.681285]  ? __bpf_prog_run32+0x6b/0x90\n  [   92.682601]  ? __bpf_prog_run64+0x90/0x90\n  [   92.683636]  ? lock_downgrade+0x370/0x370\n  [   92.684647]  ? mark_held_locks+0x44/0x90\n  [   92.685652]  ? ktime_get+0x117/0x130\n  [   92.686752]  ? lockdep_hardirqs_on+0x79/0x100\n  [   92.688004]  ? ktime_get+0x117/0x130\n  [   92.688573]  ? __cant_migrate+0x2b/0x80\n  [   92.689192]  ? bpf_test_run+0x2f4/0x510\n  [   92.689869]  ? bpf_test_timer_continue+0x1c0/0x1c0\n  [   92.690856]  ? rcu_read_lock_bh_held+0x90/0x90\n  [   92.691506]  ? __kasan_slab_alloc+0x61/0x80\n  [   92.692128]  ? eth_type_trans+0x128/0x240\n  [   92.692737]  ? __build_skb+0x46/0x50\n  [   92.693252]  ? bpf_prog_test_run_skb+0x65e/0xc50\n  [   92.693954]  ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0\n  [   92.694639]  ? __fget_light+0xa1/0x100\n  [   92.695162]  ? bpf_prog_inc+0x23/0x30\n  [   92.695685]  ? __sys_bpf+0xb40/0x2c80\n  [   92.696324]  ? bpf_link_get_from_fd+0x90/0x90\n  [   92.697150]  ? mark_held_locks+0x24/0x90\n  [   92.698007]  ? lockdep_hardirqs_on_prepare+0x124/0x220\n  [   92.699045]  ? finish_task_switch+0xe6/0x370\n  [   92.700072]  ? lockdep_hardirqs_on+0x79/0x100\n  [   92.701233]  ? finish_task_switch+0x11d/0x370\n  [   92.702264]  ? __switch_to+0x2c0/0x740\n  [   92.703148]  ? mark_held_locks+0x24/0x90\n  [   92.704155]  ? __x64_sys_bpf+0x45/0x50\n  [   92.705146]  ? do_syscall_64+0x35/0x80\n  [   92.706953]  ? entry_SYSCALL_64_after_hwframe+0x44/0xae\n  [...]\n\nTurns out that the program rejection from e411901c0b77 (\"bpf: allow for tailcalls\nin BPF subprograms for x64 JIT\") is buggy since env-\u003eprog-\u003eaux-\u003etail_call_reachable\nis never true. Commit ebf7d1f508a7 (\"bpf, x64: rework pro/epilogue and tailcall\nhandling in JIT\") added a tracker into check_max_stack_depth() which propagates\nthe tail_call_reachable condition throughout the subprograms. This info is then\nassigned to the subprogram\u0027s \n---truncated---"
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    "dateUpdated": "2026-05-11T13:51:49.342Z",
    "state": "PUBLISHED"
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      "percentile": "0.13315"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47300\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:17.820\",\"lastModified\":\"2026-06-17T04:17:08.393\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix tail_call_reachable rejection for interpreter when jit failed\\n\\nDuring testing of f263a81451c1 (\\\"bpf: Track subprog poke descriptors correctly\\nand fix use-after-free\\\") under various failure conditions, for example, when\\njit_subprogs() fails and tries to clean up the program to be run under the\\ninterpreter, we ran into the following freeze:\\n\\n  [...]\\n  #127/8 tailcall_bpf2bpf_3:FAIL\\n  [...]\\n  [   92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20\\n  [   92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682\\n  [   92.043707]\\n  [   92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G   O   5.13.0-53301-ge6c08cb33a30-dirty #87\\n  [   92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\\n  [   92.046785] Call Trace:\\n  [   92.047171]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.047773]  ? __bpf_prog_run_args32+0x8b/0xb0\\n  [   92.048389]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.049019]  ? ktime_get+0x117/0x130\\n  [...] // few hundred [similar] lines more\\n  [   92.659025]  ? ktime_get+0x117/0x130\\n  [   92.659845]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.660738]  ? __bpf_prog_run_args32+0x8b/0xb0\\n  [   92.661528]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.662378]  ? print_usage_bug+0x50/0x50\\n  [   92.663221]  ? print_usage_bug+0x50/0x50\\n  [   92.664077]  ? bpf_ksym_find+0x9c/0xe0\\n  [   92.664887]  ? ktime_get+0x117/0x130\\n  [   92.665624]  ? kernel_text_address+0xf5/0x100\\n  [   92.666529]  ? __kernel_text_address+0xe/0x30\\n  [   92.667725]  ? unwind_get_return_address+0x2f/0x50\\n  [   92.668854]  ? ___bpf_prog_run+0x15d4/0x2e20\\n  [   92.670185]  ? ktime_get+0x117/0x130\\n  [   92.671130]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.672020]  ? __bpf_prog_run_args32+0x8b/0xb0\\n  [   92.672860]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.675159]  ? ktime_get+0x117/0x130\\n  [   92.677074]  ? lock_is_held_type+0xd5/0x130\\n  [   92.678662]  ? ___bpf_prog_run+0x15d4/0x2e20\\n  [   92.680046]  ? ktime_get+0x117/0x130\\n  [   92.681285]  ? __bpf_prog_run32+0x6b/0x90\\n  [   92.682601]  ? __bpf_prog_run64+0x90/0x90\\n  [   92.683636]  ? lock_downgrade+0x370/0x370\\n  [   92.684647]  ? mark_held_locks+0x44/0x90\\n  [   92.685652]  ? ktime_get+0x117/0x130\\n  [   92.686752]  ? lockdep_hardirqs_on+0x79/0x100\\n  [   92.688004]  ? ktime_get+0x117/0x130\\n  [   92.688573]  ? __cant_migrate+0x2b/0x80\\n  [   92.689192]  ? bpf_test_run+0x2f4/0x510\\n  [   92.689869]  ? bpf_test_timer_continue+0x1c0/0x1c0\\n  [   92.690856]  ? rcu_read_lock_bh_held+0x90/0x90\\n  [   92.691506]  ? __kasan_slab_alloc+0x61/0x80\\n  [   92.692128]  ? eth_type_trans+0x128/0x240\\n  [   92.692737]  ? __build_skb+0x46/0x50\\n  [   92.693252]  ? bpf_prog_test_run_skb+0x65e/0xc50\\n  [   92.693954]  ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0\\n  [   92.694639]  ? __fget_light+0xa1/0x100\\n  [   92.695162]  ? bpf_prog_inc+0x23/0x30\\n  [   92.695685]  ? __sys_bpf+0xb40/0x2c80\\n  [   92.696324]  ? bpf_link_get_from_fd+0x90/0x90\\n  [   92.697150]  ? mark_held_locks+0x24/0x90\\n  [   92.698007]  ? lockdep_hardirqs_on_prepare+0x124/0x220\\n  [   92.699045]  ? finish_task_switch+0xe6/0x370\\n  [   92.700072]  ? lockdep_hardirqs_on+0x79/0x100\\n  [   92.701233]  ? finish_task_switch+0x11d/0x370\\n  [   92.702264]  ? __switch_to+0x2c0/0x740\\n  [   92.703148]  ? mark_held_locks+0x24/0x90\\n  [   92.704155]  ? __x64_sys_bpf+0x45/0x50\\n  [   92.705146]  ? do_syscall_64+0x35/0x80\\n  [   92.706953]  ? entry_SYSCALL_64_after_hwframe+0x44/0xae\\n  [...]\\n\\nTurns out that the program rejection from e411901c0b77 (\\\"bpf: allow for tailcalls\\nin BPF subprograms for x64 JIT\\\") is buggy since env-\u003eprog-\u003eaux-\u003etail_call_reachable\\nis never true. Commit ebf7d1f508a7 (\\\"bpf, x64: rework pro/epilogue and tailcall\\nhandling in JIT\\\") added a tracker into check_max_stack_depth() which propagates\\nthe tail_call_reachable condition throughout the subprograms. This info is then\\nassigned to the subprogram\u0027s \\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: corrige el rechazo de tail_call_reachable para el int\u00e9rprete cuando falla jit. Durante las pruebas de f263a81451c1 (\\\"bpf: rastrea correctamente los descriptores de inserci\u00f3n del subprog y corrige el use after free\\\") bajo varias condiciones de fallo, por Por ejemplo, cuando jit_subprogs() falla e intenta limpiar el programa que se ejecutar\u00e1 bajo el int\u00e9rprete, nos encontramos con el siguiente congelamiento: [...] #127/8 tailcall_bpf2bpf_3:FAIL [...] [ 92.041251] ERROR: KASAN: slab fuera de los l\u00edmites en ___bpf_prog_run+0x1b9d/0x2e20 [92.042408] Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff88800da67f68 por tarea test_progs/682 [92.043707] [92.044030] CPU: 1 PID: 682 Comm: _progs Contaminado: GO 5.13. 0-53301-ge6c08cb33a30-dirty #87 [92.045542] Nombre del hardware: PC est\u00e1ndar QEMU (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 01/04/2014 [92.046785] Seguimiento de llamadas: [92.047171] ? __bpf_prog_run_args64+0xc0/0xc0 [92.047773]? __bpf_prog_run_args32+0x8b/0xb0 [92.048389]? __bpf_prog_run_args64+0xc0/0xc0 [92.049019]? ktime_get+0x117/0x130 [...] // \u00bfunos cientos de l\u00edneas [similares] m\u00e1s [92.659025]? ktime_get+0x117/0x130 [92.659845]? __bpf_prog_run_args64+0xc0/0xc0 [92.660738]? __bpf_prog_run_args32+0x8b/0xb0 [92.661528]? __bpf_prog_run_args64+0xc0/0xc0 [92.662378]? print_usage_bug+0x50/0x50 [92.663221]? print_usage_bug+0x50/0x50 [92.664077]? bpf_ksym_find+0x9c/0xe0 [92.664887]? ktime_get+0x117/0x130 [92.665624]? kernel_text_address+0xf5/0x100 [92.666529]? __kernel_text_address+0xe/0x30 [ 92.667725] ? unwind_get_return_address+0x2f/0x50 [92.668854]? ___bpf_prog_run+0x15d4/0x2e20 [ 92.670185] ? ktime_get+0x117/0x130 [92.671130]? __bpf_prog_run_args64+0xc0/0xc0 [92.672020]? __bpf_prog_run_args32+0x8b/0xb0 [92.672860]? __bpf_prog_run_args64+0xc0/0xc0 [92.675159]? ktime_get+0x117/0x130 [92.677074]? lock_is_held_type+0xd5/0x130 [92.678662]? ___bpf_prog_run+0x15d4/0x2e20 [ 92.680046] ? ktime_get+0x117/0x130 [92.681285]? __bpf_prog_run32+0x6b/0x90 [92.682601]? __bpf_prog_run64+0x90/0x90 [92.683636]? lock_downgrade+0x370/0x370 [92.684647]? mark_held_locks+0x44/0x90 [92.685652]? ktime_get+0x117/0x130 [92.686752]? lockdep_hardirqs_on+0x79/0x100 [92.688004]? ktime_get+0x117/0x130 [92.688573]? __cant_migrate+0x2b/0x80 [ 92.689192] ? bpf_test_run+0x2f4/0x510 [92.689869]? bpf_test_timer_continue+0x1c0/0x1c0 [92.690856]? rcu_read_lock_bh_held+0x90/0x90 [92.691506]? __kasan_slab_alloc+0x61/0x80 [92.692128]? eth_type_trans+0x128/0x240 [92.692737]? __build_skb+0x46/0x50 [92.693252]? bpf_prog_test_run_skb+0x65e/0xc50 [92.693954]? bpf_prog_test_run_raw_tp+0x2d0/0x2d0 [92.694639]? __fget_light+0xa1/0x100 [ 92.695162] ? bpf_prog_inc+0x23/0x30 [92.695685]? __sys_bpf+0xb40/0x2c80 [92.696324]? bpf_link_get_from_fd+0x90/0x90 [92.697150]? mark_held_locks+0x24/0x90 [92.698007]? lockdep_hardirqs_on_prepare+0x124/0x220 [92.699045]? finish_task_switch+0xe6/0x370 [92.700072]? lockdep_hardirqs_on+0x79/0x100 [92.701233]? finish_task_switch+0x11d/0x370 [92.702264]? __switch_to+0x2c0/0x740 [ 92.703148] ? mark_held_locks+0x24/0x90 [92.704155]? __x64_sys_bpf+0x45/0x50 [92.705146]? do_syscall_64+0x35/0x80 [92.706953]? Entry_SYSCALL_64_after_hwframe+0x44/0xae [...] Resulta que el rechazo del programa de e411901c0b77 (\\\"bpf: permitir tailcalls en subprogramas BPF para x64 JIT\\\") tiene errores ya que env-\u0026gt;prog-\u0026gt;aux-\u0026gt;tail_call_reachable nunca es cierto. La confirmaci\u00f3n ebf7d1f508a7 (\\\"bpf, x64: reelaboraci\u00f3n de pro/ep\u00edlogo y manejo de tailcall en JIT\\\") agreg\u00f3 un rastreador en check_max_stack_ Depth() que propaga la condici\u00f3n tail_call_reachable a trav\u00e9s de los subprogramas. Esta informaci\u00f3n luego se asigna al ---truncado--- del subprograma.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"kernel/bpf/verifier.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ebf7d1f508a73871acf3b2bfbfa1323a477acdb3\",\"lessThan\":\"39f1735c8107ef43a53c4daf82f330d880488d8f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ebf7d1f508a73871acf3b2bfbfa1323a477acdb3\",\"lessThan\":\"cbb086074dab631ac43f8645cbac1d7b148e05c4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ebf7d1f508a73871acf3b2bfbfa1323a477acdb3\",\"lessThan\":\"5dd0a6b8582ffbfa88351949d50eccd5b6694ade\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"kernel/bpf/verifier.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.54\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.13.6\",\"lessThanOrEqual\":\"5.13.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.14\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-07-24T17:11:18.549517Z\",\"id\":\"CVE-2021-47300\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10\",\"versionEndExcluding\":\"5.10.54\",\"matchCriteriaId\":\"C9B526EA-4055-43C8-9B30-7E7067C9E43C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.13.6\",\"matchCriteriaId\":\"512C22FC-1524-4E6F-9E62-4F4B7B6E0576\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"71268287-21A8-4488-AA4F-23C473153131\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"23B9E5C6-FAB5-4A02-9E39-27C8787B0991\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-02-02T10:48:27+00:00",
      "cve": "CVE-2021-47300",
      "id": "CVE-2021-47300",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "44",
      "product_status:known_not_affected": "154",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix tail_call_reachable rejection for interpreter when jit failed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47300.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:32:08.540Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47300\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-07-24T17:11:18.549517Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:13:52.358Z\"}}], \"cna\": {\"title\": \"bpf: Fix tail_call_reachable rejection for interpreter when jit failed\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ebf7d1f508a73871acf3b2bfbfa1323a477acdb3\", \"lessThan\": \"39f1735c8107ef43a53c4daf82f330d880488d8f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ebf7d1f508a73871acf3b2bfbfa1323a477acdb3\", \"lessThan\": \"cbb086074dab631ac43f8645cbac1d7b148e05c4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ebf7d1f508a73871acf3b2bfbfa1323a477acdb3\", \"lessThan\": \"5dd0a6b8582ffbfa88351949d50eccd5b6694ade\", \"versionType\": \"git\"}], \"programFiles\": [\"kernel/bpf/verifier.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.54\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"kernel/bpf/verifier.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/39f1735c8107ef43a53c4daf82f330d880488d8f\"}, {\"url\": \"https://git.kernel.org/stable/c/cbb086074dab631ac43f8645cbac1d7b148e05c4\"}, {\"url\": \"https://git.kernel.org/stable/c/5dd0a6b8582ffbfa88351949d50eccd5b6694ade\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Fix tail_call_reachable rejection for interpreter when jit failed\\n\\nDuring testing of f263a81451c1 (\\\"bpf: Track subprog poke descriptors correctly\\nand fix use-after-free\\\") under various failure conditions, for example, when\\njit_subprogs() fails and tries to clean up the program to be run under the\\ninterpreter, we ran into the following freeze:\\n\\n  [...]\\n  #127/8 tailcall_bpf2bpf_3:FAIL\\n  [...]\\n  [   92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20\\n  [   92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682\\n  [   92.043707]\\n  [   92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G   O   5.13.0-53301-ge6c08cb33a30-dirty #87\\n  [   92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014\\n  [   92.046785] Call Trace:\\n  [   92.047171]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.047773]  ? __bpf_prog_run_args32+0x8b/0xb0\\n  [   92.048389]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.049019]  ? ktime_get+0x117/0x130\\n  [...] // few hundred [similar] lines more\\n  [   92.659025]  ? ktime_get+0x117/0x130\\n  [   92.659845]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.660738]  ? __bpf_prog_run_args32+0x8b/0xb0\\n  [   92.661528]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.662378]  ? print_usage_bug+0x50/0x50\\n  [   92.663221]  ? print_usage_bug+0x50/0x50\\n  [   92.664077]  ? bpf_ksym_find+0x9c/0xe0\\n  [   92.664887]  ? ktime_get+0x117/0x130\\n  [   92.665624]  ? kernel_text_address+0xf5/0x100\\n  [   92.666529]  ? __kernel_text_address+0xe/0x30\\n  [   92.667725]  ? unwind_get_return_address+0x2f/0x50\\n  [   92.668854]  ? ___bpf_prog_run+0x15d4/0x2e20\\n  [   92.670185]  ? ktime_get+0x117/0x130\\n  [   92.671130]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.672020]  ? __bpf_prog_run_args32+0x8b/0xb0\\n  [   92.672860]  ? __bpf_prog_run_args64+0xc0/0xc0\\n  [   92.675159]  ? ktime_get+0x117/0x130\\n  [   92.677074]  ? lock_is_held_type+0xd5/0x130\\n  [   92.678662]  ? ___bpf_prog_run+0x15d4/0x2e20\\n  [   92.680046]  ? ktime_get+0x117/0x130\\n  [   92.681285]  ? __bpf_prog_run32+0x6b/0x90\\n  [   92.682601]  ? __bpf_prog_run64+0x90/0x90\\n  [   92.683636]  ? lock_downgrade+0x370/0x370\\n  [   92.684647]  ? mark_held_locks+0x44/0x90\\n  [   92.685652]  ? ktime_get+0x117/0x130\\n  [   92.686752]  ? lockdep_hardirqs_on+0x79/0x100\\n  [   92.688004]  ? ktime_get+0x117/0x130\\n  [   92.688573]  ? __cant_migrate+0x2b/0x80\\n  [   92.689192]  ? bpf_test_run+0x2f4/0x510\\n  [   92.689869]  ? bpf_test_timer_continue+0x1c0/0x1c0\\n  [   92.690856]  ? rcu_read_lock_bh_held+0x90/0x90\\n  [   92.691506]  ? __kasan_slab_alloc+0x61/0x80\\n  [   92.692128]  ? eth_type_trans+0x128/0x240\\n  [   92.692737]  ? __build_skb+0x46/0x50\\n  [   92.693252]  ? bpf_prog_test_run_skb+0x65e/0xc50\\n  [   92.693954]  ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0\\n  [   92.694639]  ? __fget_light+0xa1/0x100\\n  [   92.695162]  ? bpf_prog_inc+0x23/0x30\\n  [   92.695685]  ? __sys_bpf+0xb40/0x2c80\\n  [   92.696324]  ? bpf_link_get_from_fd+0x90/0x90\\n  [   92.697150]  ? mark_held_locks+0x24/0x90\\n  [   92.698007]  ? lockdep_hardirqs_on_prepare+0x124/0x220\\n  [   92.699045]  ? finish_task_switch+0xe6/0x370\\n  [   92.700072]  ? lockdep_hardirqs_on+0x79/0x100\\n  [   92.701233]  ? finish_task_switch+0x11d/0x370\\n  [   92.702264]  ? __switch_to+0x2c0/0x740\\n  [   92.703148]  ? mark_held_locks+0x24/0x90\\n  [   92.704155]  ? __x64_sys_bpf+0x45/0x50\\n  [   92.705146]  ? do_syscall_64+0x35/0x80\\n  [   92.706953]  ? entry_SYSCALL_64_after_hwframe+0x44/0xae\\n  [...]\\n\\nTurns out that the program rejection from e411901c0b77 (\\\"bpf: allow for tailcalls\\nin BPF subprograms for x64 JIT\\\") is buggy since env-\u003eprog-\u003eaux-\u003etail_call_reachable\\nis never true. Commit ebf7d1f508a7 (\\\"bpf, x64: rework pro/epilogue and tailcall\\nhandling in JIT\\\") added a tracker into check_max_stack_depth() which propagates\\nthe tail_call_reachable condition throughout the subprograms. This info is then\\nassigned to the subprogram\u0027s \\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.54\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.6\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"5.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:51:49.342Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47300\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:51:49.342Z\", \"dateReserved\": \"2024-05-21T13:27:52.132Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:22.040Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.