CVE-2023-53694 (GCVE-0-2023-53694)

Vulnerability from cvelistv5 – Published: 2025-10-22 13:23 – Updated: 2026-05-11 19:50
VLAI
Title
riscv: ftrace: Fixup panic by disabling preemption
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: ftrace: Fixup panic by disabling preemption In RISCV, we must use an AUIPC + JALR pair to encode an immediate, forming a jump that jumps to an address over 4K. This may cause errors if we want to enable kernel preemption and remove dependency from patching code with stop_machine(). For example, if a task was switched out on auipc. And, if we changed the ftrace function before it was switched back, then it would jump to an address that has updated 11:0 bits mixing with previous XLEN:12 part. p: patched area performed by dynamic ftrace ftrace_prologue: p| REG_S ra, -SZREG(sp) p| auipc ra, 0x? ------------> preempted ... change ftrace function ... p| jalr -?(ra) <------------- switched back p| REG_L ra, -SZREG(sp) func: xxx ret
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: afc76b8b80112189b6f11e67e19cf58301944814 , < 84cfcf240f4a577733b1d98fcd2611a611612b03 (git)
Affected: afc76b8b80112189b6f11e67e19cf58301944814 , < 20a7510e781084364691b4962de31de758194cc9 (git)
Affected: afc76b8b80112189b6f11e67e19cf58301944814 , < 8547649981e6631328cd64f583667501ae385531 (git)
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Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 6.1.23 , ≤ 6.1.* (semver)
Unaffected: 6.2.3 , ≤ 6.2.* (semver)
Unaffected: 6.3 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: ftrace: Fixup panic by disabling preemption\n\nIn RISCV, we must use an AUIPC + JALR pair to encode an immediate,\nforming a jump that jumps to an address over 4K. This may cause errors\nif we want to enable kernel preemption and remove dependency from\npatching code with stop_machine(). For example, if a task was switched\nout on auipc. And, if we changed the ftrace function before it was\nswitched back, then it would jump to an address that has updated 11:0\nbits mixing with previous XLEN:12 part.\n\np: patched area performed by dynamic ftrace\nftrace_prologue:\np|      REG_S   ra, -SZREG(sp)\np|      auipc   ra, 0x? ------------\u003e preempted\n\t\t\t\t\t...\n\t\t\t\tchange ftrace function\n\t\t\t\t\t...\np|      jalr    -?(ra) \u003c------------- switched back\np|      REG_L   ra, -SZREG(sp)\nfunc:\n\txxx\n\tret"
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        "metrics": {},
        "published": "2025-10-22T14:15:43.887",
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      "source": "Red Hat CSAF VEX",
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      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-53694.json",
      "version": "3"
    }
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}



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