Vulnerability-Lookup

GHSA-2P2C-QGQR-9GHC

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2025-05-12 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

powerpc/bpf: Fix detecting BPF atomic instructions

Commit 91c960b0056672 ("bpf: Rename BPF_XADD and prepare to encode other atomics in .imm") converted BPF_XADD to BPF_ATOMIC and added a way to distinguish instructions based on the immediate field. Existing JIT implementations were updated to check for the immediate field and to reject programs utilizing anything more than BPF_ADD (such as BPF_FETCH) in the immediate field.

However, the check added to powerpc64 JIT did not look at the correct BPF instruction. Due to this, such programs would be accepted and incorrectly JIT'ed resulting in soft lockups, as seen with the atomic bounds test. Fix this by looking at the correct immediate value.

Severity

3.3 (Low)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47317"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:19Z",
    "severity": "LOW"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/bpf: Fix detecting BPF atomic instructions\n\nCommit 91c960b0056672 (\"bpf: Rename BPF_XADD and prepare to encode other\natomics in .imm\") converted BPF_XADD to BPF_ATOMIC and added a way to\ndistinguish instructions based on the immediate field. Existing JIT\nimplementations were updated to check for the immediate field and to\nreject programs utilizing anything more than BPF_ADD (such as BPF_FETCH)\nin the immediate field.\n\nHowever, the check added to powerpc64 JIT did not look at the correct\nBPF instruction. Due to this, such programs would be accepted and\nincorrectly JIT\u0027ed resulting in soft lockups, as seen with the atomic\nbounds test. Fix this by looking at the correct immediate value.",
  "id": "GHSA-2p2c-qgqr-9ghc",
  "modified": "2025-05-12T21:30:55Z",
  "published": "2024-05-21T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47317"
    },
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      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d435b6d94b05dcfd836d758a63145aa566618e2"
    },
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      "url": "https://git.kernel.org/stable/c/419ac821766cbdb9fd85872bb3f1a589df05c94c"
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      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-47317 (GCVE-0-2021-47317)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52

Title

powerpc/bpf: Fix detecting BPF atomic instructions

Summary

In the Linux kernel, the following vulnerability has been resolved: powerpc/bpf: Fix detecting BPF atomic instructions Commit 91c960b0056672 ("bpf: Rename BPF_XADD and prepare to encode other atomics in .imm") converted BPF_XADD to BPF_ATOMIC and added a way to distinguish instructions based on the immediate field. Existing JIT implementations were updated to check for the immediate field and to reject programs utilizing anything more than BPF_ADD (such as BPF_FETCH) in the immediate field. However, the check added to powerpc64 JIT did not look at the correct BPF instruction. Due to this, such programs would be accepted and incorrectly JIT'ed resulting in soft lockups, as seen with the atomic bounds test. Fix this by looking at the correct immediate value.

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/7284dab07e4d51d45…
https://git.kernel.org/stable/c/0d435b6d94b05dcfd…
https://git.kernel.org/stable/c/419ac821766cbdb9f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 91c960b0056672e74627776655c926388350fa30 , < 7284dab07e4d51d453cc42851fae9ec4fac6ef2f (git) Affected: 91c960b0056672e74627776655c926388350fa30 , < 0d435b6d94b05dcfd836d758a63145aa566618e2 (git) Affected: 91c960b0056672e74627776655c926388350fa30 , < 419ac821766cbdb9fd85872bb3f1a589df05c94c (git)
Linux	Linux	Affected: 5.12 Unaffected: 0 , < 5.12 (semver) Unaffected: 5.12.19 , ≤ 5.12.* (semver) Unaffected: 5.13.4 , ≤ 5.13.* (semver) Unaffected: 5.14 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-2P2C-QGQR-9GHC

CVE-2021-47317 (GCVE-0-2021-47317)

Tags

Sightings

Nomenclature