# CVE-2023-52995: linux: In the Linux kernel, the following vulnerability has been resolved:  riscv/kprobe: Fix instruction simulation of JALR...

CVE-2023-52995 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52995, released March 27, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-52995
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 27, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  riscv/kprobe: Fix instruction simulation of JALR  Set kprobe at 'jalr 1140(ra)' of vfs_write results in the following crash:  [   32.092235] Unable to handle kernel access to user memory without uaccess routines at virtual address 00aaaaaad77b1170 [   32.093115] Oops [#1] [   32.093251] Modules linked in: [   32.093626] CPU: 0 PID: 135 Comm: ftracetest Not tainted 6.2.0-rc2-00013-gb0aa5e5df0cb-dirty #16 [   32.093985] Hardware name: riscv-virtio,qemu (DT) [   32.094280] epc : ksys_read+0x88/0xd6 [   32.094855]  ra : ksys_read+0xc0/0xd6 [   32.095016] epc : ffffffff801cda80 ra : ffffffff801cdab8 sp : ff20000000d7bdc0 [   32.095227]  gp : ffffffff80f14000 tp : ff60000080f9cb40 t0 : ffffffff80f13e80 [   32.095500]  t1 : ffffffff8000c29c t2 : ffffffff800dbc54 s0 : ff20000000d7be60 [   32.095716]  s1 : 0000000000000000 a0 : ffffffff805a64ae a1 : ffffffff80a83708 [   32.095921]  a2 : ffffffff80f160a0 a3 : 0000000000000000 a4 : f229b0afdb165300 [   32.096171]  a5 : f229b0afdb165300 a6 : ffffffff80eeebd0 a7 : 00000000000003ff [   32.096411]  s2 : ff6000007ff76800 s3 : fffffffffffffff7 s4 : 00aaaaaad77b1170 [   32.096638]  s5 : ffffffff80f160a0 s6 : ff6000007ff76800 s7 : 0000000000000030 [   32.096865]  s8 : 00ffffffc3d97be0 s9 : 0000000000000007 s10: 00aaaaaad77c9410 [   32.097092]  s11: 0000000000000000 t3 : ffffffff80f13e48 t4 : ffffffff8000c29c [   32.097317]  t5 : ffffffff8000c29c t6 : ffffffff800dbc54 [   32.097505] status: 0000000200000120 badaddr: 00aaaaaad77b1170 cause: 000000000000000d [   32.098011] [<ffffffff801cdb72>] ksys_write+0x6c/0xd6 [   32.098222] [<ffffffff801cdc06>] sys_write+0x2a/0x38 [   32.098405] [<ffffffff80003c76>] ret_from_syscall+0x0/0x2  Since the rs1 and rd might be the same one, such as 'jalr 1140(ra)', hence it requires obtaining the target address from rs1 followed by updating rd.  [Palmer: Pick Guo's cleanup]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.11-1 | [DEBIAN-CVE-2023-52995](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52995.md) | Mar 27, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.11-1 | [DEBIAN-CVE-2023-52995](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52995.md) | Mar 27, 2025 |
| Linux | linux Debian 14 | 6.1.11-1 | [DEBIAN-CVE-2023-52995](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52995.md) | Mar 27, 2025 |

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