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CVE-2022-48929

bpf: Fix crash due to out of bounds access into reg2btf_ids.

Medium5.5EPSS 0.21%
Published
Updated
Reserved
Assigned by
Linux

Description

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.

Scores

CVSS scores of CVE-2022-48929, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.21% · top 89% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

Affected products

  • Linux · Linux

    • affected 8d38cde47a7e17b646401fa92d916503caa5375e – < 8c39925e98d498b9531343066ef82ae39e41adae
    • affected 77459bc4d5e2c6f24db845780b4d9d60cf82d06a – < f0ce1bc9e0235dd7412240be493d7ea65ed9eadc
    • affected c25b2ae136039ffa820c26138ed4a5e5f3ab3841 – < 45ce4b4f9009102cd9f581196d480a59208690c1

  • Linux · Linux

    • affected 5.16.11 – < 5.16.12

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .