# CVE-2022-49870: capabilities: fix undefined behavior in bit shift for CAP_TO_MASK

Status: published. Published: 2025-05-01. Updated: 2026-11-05.

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>

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ e338d263a76af78fe8f38a72131188b58fceb591; < 5b79fa628e2ab789e629a83cd211ef9b4c1a593e (affected, git); ≥ e338d263a76af78fe8f38a72131188b58fceb591; < 65b0bc7a0690861812ade523d19f82688ab819dc (affected, git); ≥ e338d263a76af78fe8f38a72131188b58fceb591; < dbaab08c8677d598244d21afb7818e44e1c5d826 (affected, git); ≥ e338d263a76af78fe8f38a72131188b58fceb591; < 5661f111a1616ac105ec8cec81bff99b60f847ac (affected, git); ≥ e338d263a76af78fe8f38a72131188b58fceb591; < fcbd2b336834bd24e1d9454ad5737856470c10d7 (affected, git); ≥ e338d263a76af78fe8f38a72131188b58fceb591; < 151dc8087b5609e53b069c068e3f3ee100efa586 (affected, git); ≥ e338d263a76af78fe8f38a72131188b58fceb591; < 27bdb134c043ff32c459d98f16550d0ffa0b3c34 (affected, git); ≥ e338d263a76af78fe8f38a72131188b58fceb591; < 46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13 (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.25 (affected); ≥ 0; < 2.6.25 (unaffected, semver); ≥ 4.9.334; ≤ 4.9.* (unaffected, semver); ≥ 4.14.300; ≤ 4.14.* (unaffected, semver); ≥ 4.19.267; ≤ 4.19.* (unaffected, semver); ≥ 5.4.225; ≤ 5.4.* (unaffected, semver); ≥ 5.10.155; ≤ 5.10.* (unaffected, semver); ≥ 5.15.79; ≤ 5.15.* (unaffected, semver); ≥ 6.0.9; ≤ 6.0.* (unaffected, semver); ≥ 6.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-05; percentile 13.06%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/5b79fa628e2ab789e629a83cd211ef9b4c1a593e (CNA: Linux)

- https://git.kernel.org/stable/c/65b0bc7a0690861812ade523d19f82688ab819dc (CNA: Linux)

- https://git.kernel.org/stable/c/dbaab08c8677d598244d21afb7818e44e1c5d826 (CNA: Linux)

- https://git.kernel.org/stable/c/5661f111a1616ac105ec8cec81bff99b60f847ac (CNA: Linux)

- https://git.kernel.org/stable/c/fcbd2b336834bd24e1d9454ad5737856470c10d7 (CNA: Linux)

- https://git.kernel.org/stable/c/151dc8087b5609e53b069c068e3f3ee100efa586 (CNA: Linux)

- https://git.kernel.org/stable/c/27bdb134c043ff32c459d98f16550d0ffa0b3c34 (CNA: Linux)

- https://git.kernel.org/stable/c/46653972e3ea64f79e7f8ae3aa41a4d3fdb70a13 (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49870; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49870; retrieved 2026-11-05; source updated Not reported

Revision: 6a8d3b84c64f97087014b0b4890cb57daa5b684aa1e252060275a9a1b7e8bcaf

Canonical: https://y2.dev/cve/CVE-2022-49870

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.