CVE-2022-49870: linux kernel Out-of-bounds Read — Fix

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>

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
linux	linux_kernel	2.6.25 — 4.9.334
linux	linux_kernel	4.10 — 4.14.300
linux	linux_kernel	4.15 — 4.19.267
linux	linux_kernel	4.20 — 5.4.225
linux	linux_kernel	5.5 — 5.10.155
linux	linux_kernel	5.11 — 5.15.79
linux	linux_kernel	5.16 — 6.0.9
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/151dc8087b5609e53b069c068e3f3ee100efa586 https://git.kernel.org/stable/c/27bdb134c043ff32c459d98f16550d0ffa0b3c34 https://git.kernel.org/stable/c/46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13 https://git.kernel.org/stable/c/5661f111a1616ac105ec8cec81bff99b60f847ac 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/fcbd2b336834bd24e1d9454ad5737856470c10d7

Frequently Asked Questions

What is CVE-2022-49870? +

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> It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2022-49870? +

CVE-2022-49870 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49870? +

CVE-2022-49870 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49870? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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