CVE-2022-49870

capabilities: fix undefined behavior in bit shift for CAP_TO_MASK

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>

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/5b79fa628e2ab789e629a83cd211ef9b4c1a593e
https://git.kernel.org/stable/c/65b0bc7a0690861812ade523d19f82688ab819dc
https://git.kernel.org/stable/c/dbaab08c8677d598244d21afb7818e44e1c5d826
https://git.kernel.org/stable/c/5661f111a1616ac105ec8cec81bff99b60f847ac
https://git.kernel.org/stable/c/fcbd2b336834bd24e1d9454ad5737856470c10d7
https://git.kernel.org/stable/c/151dc8087b5609e53b069c068e3f3ee100efa586
https://git.kernel.org/stable/c/27bdb134c043ff32c459d98f16550d0ffa0b3c34
https://git.kernel.org/stable/c/46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13

Frequently Asked Questions

What is the severity of CVE-2022-49870?: CVE-2022-49870 has not yet been assigned a CVSS score.
How to fix CVE-2022-49870?: To fix CVE-2022-49870, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49870 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49870 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49870?: CVE-2022-49870 affects Linux Linux, Linux Linux.

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