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Review reviewHigh

CVE-2022-49001

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: riscv: fix race when vmap stack overflow Currently, when detecting vmap stack overflow, riscv firstly switches to the so called shadow stack, then use this shadow stack to call the get_overflow_stack() to get the overflow stack. However, there's a race here if two or more harts use the same shadow stack at the same time. To solve this race, we introduce spin_shadow_stack atomic var, which will be swap between its own address and 0 in atomic way, when the var is set, it means the shadow_stack is being used; when the var is c...

CVSS
7
EPSS
0.19%
8.85% percentile
CISA KEV
Not listed
Published
2024.10.22
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.19%
Technical severityCVSS 7

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: riscv: fix race when vmap stack overflow Currently, when detecting vmap stack overflow, riscv firstly switches to the so called shadow stack, then use this shadow stack to call the get_overflow_stack() to get the overflow stack. However, there's a race here if two or more harts use the same shadow stack at the same time. To solve this race, we introduce spin_shadow_stack atomic var, which will be swap between its own address and 0 in atomic way, when the var is set, it means the shadow_stack is being used; when the var is c...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 31da94c25aea835ceac00575a9fd206c5a833fed < ac00301adb19df54f2eae1efc4bad7447c0156ce, >= 31da94c25aea835ceac00575a9fd206c5a833fed < 879fabc5a95401d9bce357e4b1d24ae4a360a81f, >= 31da94c25aea835ceac00575a9fd206c5a833fed < 7e1864332fbc1b993659eab7974da9fe8bf8c128, >= 5.14, >= 5.14 < 5.15.82, >= 5.16 < 6.0.12, 6.1
Fixed versions
5.15.82, 6.0.12

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-362
CVE-2022-49001 — Linux Linux, linux kernel | SECUFOCUS NOW