CVE-2022-49870
Description
In the Linux kernel, the following vulnerability has been resolved: capabilities: fix undefined behavior in bit shift for CAP_TO_MASK Shifting signed 32-bit value by 31 bits is undefined, so changing significant bit to unsigned. The UBSAN warning calltrace like below: UBSAN: shift-out-of-bounds in security/commoncap.c:1252:2 left shift of 1 by 31 places cannot be represented in type 'int' Call Trace: <TASK> dump_stack_lvl+0x7d/0xa5 dump_stack+0x15/0x1b ubsan_epilogue+0xe/0x4e __ubsan_handle_shift_out_of_bounds+0x1e7/0x20c cap_task_prctl+0x561/0x6f0 security_task_prctl+0x5a/0xb0 __x64_sys_prctl+0x61/0x8f0 do_syscall_64+0x58/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK>
How to fix
- linux linux_kernel4.9.334, 4.14.300, 4.19.267, 5.4.225, 5.10.155, 5.15.79, 6.0.9 or later
- git.kernel.org/stable/c/151dc8087b5609e53b069c068e3f3ee100efa586
- git.kernel.org/stable/c/27bdb134c043ff32c459d98f16550d0ffa0b3c34
- git.kernel.org/stable/c/46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13
- git.kernel.org/stable/c/5661f111a1616ac105ec8cec81bff99b60f847ac
- git.kernel.org/stable/c/5b79fa628e2ab789e629a83cd211ef9b4c1a593e
- git.kernel.org/stable/c/65b0bc7a0690861812ade523d19f82688ab819dc
- git.kernel.org/stable/c/dbaab08c8677d598244d21afb7818e44e1c5d826
- git.kernel.org/stable/c/fcbd2b336834bd24e1d9454ad5737856470c10d7
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.25 ≤ v < 4.9.334, 4.10 ≤ v < 4.14.300, 4.15 ≤ v < 4.19.267, 4.20 ≤ v < 5.4.225, 5.5 ≤ v < 5.10.155, 5.11 ≤ v < 5.15.79, 5.16 ≤ v < 6.0.9, 6.1 | 4.9.334, 4.14.300, 4.19.267, 5.4.225, 5.10.155, 5.15.79, 6.0.9 |
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