CVE-2023-53694
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
Affected versions
Linux kernel versions
5.12
and later are affected. Fixed in
6.1.23,
6.2.3,
6.3
and their respective stable series.
References
The following references provide additional information about CVE-2023-53694 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/20a7510e781084364691b4962de31de758194cc9
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PatchKernel patch commithttps://git.kernel.org/stable/c/84cfcf240f4a577733b1d98fcd2611a611612b03
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PatchKernel patch commithttps://git.kernel.org/stable/c/8547649981e6631328cd64f583667501ae385531
Frequently asked questions
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What is CVE-2023-53694?
CVE-2023-53694 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.12 onward and has been patched in 6.1.23, 6.2.3 and 6.3. CVE-2023-53694 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2023-53694?
Yes — CVE-2023-53694 has been patched. Fixed versions include 6.1.23, 6.2.3 and 6.3. If you are running Linux kernel 5.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2023-53694 actively exploited?
No — CVE-2023-53694 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.