CVE-2022-48929 (GCVE-0-2022-48929)
Vulnerability from cvelistv5
Published
2024-08-22 03:31
Modified
2026-05-11 18:49
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix crash due to out of bounds access into reg2btf_ids. When commit e6ac2450d6de ("bpf: Support bpf program calling kernel function") added kfunc support, it defined reg2btf_ids as a cheap way to translate the verifier reg type to the appropriate btf_vmlinux BTF ID, however commit c25b2ae13603 ("bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX | PTR_MAYBE_NULL") moved the __BPF_REG_TYPE_MAX from the last member of bpf_reg_type enum to after the base register types, and defined other variants using type flag composition. However, now, the direct usage of reg->type to index into reg2btf_ids may no longer fall into __BPF_REG_TYPE_MAX range, and hence lead to out of bounds access and kernel crash on dereference of bad pointer.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8d38cde47a7e17b646401fa92d916503caa5375e
Version: 77459bc4d5e2c6f24db845780b4d9d60cf82d06a
Version: c25b2ae136039ffa820c26138ed4a5e5f3ab3841
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                "id": "CVE-2022-48929",
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                "timestamp": "2024-09-10T15:32:56.249126Z",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix crash due to out of bounds access into reg2btf_ids.\n\nWhen commit e6ac2450d6de (\"bpf: Support bpf program calling kernel function\") added\nkfunc support, it defined reg2btf_ids as a cheap way to translate the verifier\nreg type to the appropriate btf_vmlinux BTF ID, however\ncommit c25b2ae13603 (\"bpf: Replace PTR_TO_XXX_OR_NULL with PTR_TO_XXX | PTR_MAYBE_NULL\")\nmoved the __BPF_REG_TYPE_MAX from the last member of bpf_reg_type enum to after\nthe base register types, and defined other variants using type flag\ncomposition. However, now, the direct usage of reg-\u003etype to index into\nreg2btf_ids may no longer fall into __BPF_REG_TYPE_MAX range, and hence lead to\nout of bounds access and kernel crash on dereference of bad pointer."
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        "dateUpdated": "2026-05-11T18:49:52.882Z",
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          "url": "https://git.kernel.org/stable/c/45ce4b4f9009102cd9f581196d480a59208690c1"
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    "cveId": "CVE-2022-48929",
    "datePublished": "2024-08-22T03:31:22.329Z",
    "dateReserved": "2024-08-21T06:06:23.298Z",
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