{"cve":"CVE-2022-50647","nvd":{"published":"2025-12-09T01:16:47.360","modified":"2026-06-17T05:23:55.647","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: Make port I/O string accessors actually work\n\nFix port I/O string accessors such as `insb', `outsb', etc. which use\nthe physical PCI port I/O address rather than the corresponding memory\nmapping to get at the requested location, which in turn breaks at least\naccesses made by our parport driver to a PCIe parallel port such as:\n\nPCI parallel port detected: 1415:c118, I/O at 0x1000(0x1008), IRQ 20\nparport0: PC-style at 0x1000 (0x1008), irq 20, using FIFO [PCSPP,TRISTATE,COMPAT,EPP,ECP]\n\ncausing a memory access fault:\n\nUnable to handle kernel access to user memory without uaccess routines at virtual address 0000000000001008\nOops [#1]\nModules linked in:\nCPU: 1 PID: 350 Comm: cat Not tainted 6.0.0-rc2-00283-g10d4879f9ef0-dirty #23\nHardware name: SiFive HiFive Unmatched A00 (DT)\nepc : parport_pc_fifo_write_block_pio+0x266/0x416\n ra : parport_pc_fifo_write_block_pio+0xb4/0x416\nepc : ffffffff80542c3e ra : ffffffff80542a8c sp : ffffffd88899fc60\n gp : ffffffff80fa2700 tp : ffffffd882b1e900 t0 : ffffffd883d0b000\n t1 : ffffffffff000002 t2 : 4646393043330a38 s0 : ffffffd88899fcf0\n s1 : 0000000000001000 a0 : 0000000000000010 a1 : 0000000000000000\n a2 : ffffffd883d0a010 a3 : 0000000000000023 a4 : 00000000ffff8fbb\n a5 : ffffffd883d0a001 a6 : 0000000100000000 a7 : ffffffc800000000\n s2 : ffffffffff000002 s3 : ffffffff80d28880 s4 : ffffffff80fa1f50\n s5 : 0000000000001008 s6 : 0000000000000008 s7 : ffffffd883d0a000\n s8 : 0004000000000000 s9 : ffffffff80dc1d80 s10: ffffffd8807e4000\n s11: 0000000000000000 t3 : 00000000000000ff t4 : 393044410a303930\n t5 : 0000000000001000 t6 : 0000000000040000\nstatus: 0000000200000120 badaddr: 0000000000001008 cause: 000000000000000f\n[<ffffffff80543212>] parport_pc_compat_write_block_pio+0xfe/0x200\n[<ffffffff8053bbc0>] parport_write+0x46/0xf8\n[<ffffffff8050530e>] lp_write+0x158/0x2d2\n[<ffffffff80185716>] vfs_write+0x8e/0x2c2\n[<ffffffff80185a74>] ksys_write+0x52/0xc2\n[<ffffffff80185af2>] sys_write+0xe/0x16\n[<ffffffff80003770>] ret_from_syscall+0x0/0x2\n---[ end trace 0000000000000000 ]---\n\nFor simplicity address the problem by adding PCI_IOBASE to the physical\naddress requested in the respective wrapper macros only, observing that\nthe raw accessors such as `__insb', `__outsb', etc. are not supposed to\nbe used other than by said macros.  Remove the cast to `long' that is no\nlonger needed on `addr' now that it is used as an offset from PCI_IOBASE\nand add parentheses around `addr' needed for predictable evaluation in\nmacro expansion.  No need to make said adjustments in separate changes\ngiven that current code is gravely broken and does not ever work.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/140b2b92dbefffa7f4f7211a1fd399a6e79e71c4","https://git.kernel.org/stable/c/1acee4616930fc07265cb8e539753a8062daa8e0","https://git.kernel.org/stable/c/2c60db6869fe5213471fcf4fe5704dc29da8b5ee","https://git.kernel.org/stable/c/2ce9fab94b8db61f014e43ddf80dd1524ae6dff4","https://git.kernel.org/stable/c/9cc205e3c17d5716da7ebb7fa0c985555e95d009"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2022-50647","score":0.00205,"percentile":0.10499,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}