GHSA-6G34-GGC8-PV58
Vulnerability from github – Published: 2026-09-25 12:31 – Updated: 2026-09-25 12:31In the Linux kernel, the following vulnerability has been resolved:
bpf: don't rewrite bpf_fastcall patterns entered by a jump
mark_fastcall_pattern_for_call() must ensure that matched "spill; call; fill" instruction series is not interrupted by a jump. Otherwise the rewrite applied by bpf_remove_fastcall_spills_fills() is not sound.
Record the instructions targeted by jumps in insn_aux_data[*].jump_target when the CFG is built and use this flag to stop growing a pattern at such an instruction. Jumps to the first spill are fine.
Note that existing insn_aux_data[*].jmp_point field can't be reused, as it marks subprogram return instructions.
{
"affected": [],
"aliases": [
"CVE-2026-98048"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-25T11:17:33Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: don\u0027t rewrite bpf_fastcall patterns entered by a jump\n\nmark_fastcall_pattern_for_call() must ensure that matched\n\"spill; call; fill\" instruction series is not interrupted by a jump.\nOtherwise the rewrite applied by bpf_remove_fastcall_spills_fills()\nis not sound.\n\nRecord the instructions targeted by jumps in\ninsn_aux_data[*].jump_target when the CFG is built and use this flag\nto stop growing a pattern at such an instruction. Jumps to the first\nspill are fine.\n\nNote that existing insn_aux_data[*].jmp_point field can\u0027t be reused,\nas it marks subprogram return instructions.",
"id": "GHSA-6g34-ggc8-pv58",
"modified": "2026-09-25T12:31:34Z",
"published": "2026-09-25T12:31:34Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98048"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0b1c83dc3c4401cd7e846548f62e3caf3d06742e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/24adbc2c3bbe3385ce922587e1f8e837a68b3e25"
}
],
"schema_version": "1.4.0",
"severity": []
}
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