CVE-2021-47317 - OpenCVE

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.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/0d435b6d94b05dcfd836d758a63145aa566618e2
https://git.kernel.org/stable/c/419ac821766cbdb9fd85872bb3f1a589df05c94c
https://git.kernel.org/stable/c/7284dab07e4d51d453cc42851fae9ec4fac6ef2f
https://lore.kernel.org/linux-cve-announce/2024052130-CVE-2021-47317-3729@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47317
https://www.cve.org/CVERecord?id=CVE-2021-47317

History

Wed, 11 Sep 2024 18:30:00 +0000

Type	Values Removed	Values Added
Metrics	ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Wed, 11 Sep 2024 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-21T14:35:33.212Z

Updated: 2024-11-04T12:03:34.630Z

Reserved: 2024-05-21T14:28:16.973Z

Link: CVE-2021-47317

Vulnrichment

Updated: 2024-08-04T05:32:08.533Z

NVD

Status : Awaiting Analysis

Published: 2024-05-21T15:15:19.007

Modified: 2024-05-21T16:54:26.047

Link: CVE-2021-47317

Redhat

Severity : Low

Publid Date: 2024-05-21T00:00:00Z

Links: CVE-2021-47317 - Bugzilla

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{"bugzilla": {"description": "kernel: powerpc/bpf: Fix detecting BPF atomic instructions", "id": "2282463", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282463"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\npowerpc/bpf: Fix detecting BPF atomic instructions\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.\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'ed resulting in soft lockups, as seen with the atomic\nbounds test. Fix this by looking at the correct immediate value."], "name": "CVE-2021-47317", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47317\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47317\nhttps://lore.kernel.org/linux-cve-announce/2024052130-CVE-2021-47317-3729@gregkh/T"], "threat_severity": "Low", "upstream_fix": "kernel 5.12.19, kernel 5.13.4, kernel 5.14"}