FKIE_CVE-2026-98228

Vulnerability from fkie_nvd - Published: 2026-10-06 09:18 - Updated: 2026-10-07 07:17
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ On I6500 CPU cores, lld and scd give no ordering guarantees (same as all other instructions). To respect the assumption that arch_cmpxchg() is fully ordered, we must inject sync instructions above and below our lld/scd loops using the already in place WEAK_REORDERING_BEYOND_LLSC infrastructure. Otherwise, bad things can happen: [ 34.054496] CPU 3 Unable to handle kernel paging request at virtual address 0000000000000000, epc == a80000080838e01c, ra == a80000080838dfc4 [ 34.054559] Oops[#1]: [ 34.069561] CPU: 3 UID: 0 PID: 170 Comm: pipe_race Not tainted 7.2.0-rc6-01553-gb73c35220968-dirty #103 VOLUNTARY [ 34.079932] Hardware name: Mobile EyeQ5 MP5 Evaluation board [ 34.085592] $ 0 : 0000000000000000 0000000000000001 0000000000000000 0000000000000000 [ 34.093616] $ 4 : a800000808ee2618 000000000b7a879d 0000000000001000 0000000000000000 [ 34.101638] $ 8 : 0000000000e3f2c9 0000000000000000 a800000808a2a9f8 0000000000000000 [ 34.109660] $12 : a8000008139ffcd8 ffffffff84080018 a80000080837fae0 7878787878787878 [ 34.117682] $16 : a800000807e82940 0000000000001000 0000000000000000 0000000000000000 [ 34.125704] $20 : a800000802920e00 a8000008139ffdf8 a800000802649400 0000000000e3f2c9 [ 34.133726] $24 : 0000000000000006 00000001200406e0 [ 34.141783] $28 : a8000008139fc000 a8000008139ffd10 0000000000e3f2c8 a80000080838dfc4 [ 34.149837] epc : a80000080838e01c anon_pipe_read+0xd4/0x428 [ 34.155697] ra : a80000080838dfc4 anon_pipe_read+0x7c/0x428 [ 34.161549] Status: 140000e3 KX SX UX KERNEL EXL IE [ 34.166551] Cause : 40800408 (ExcCode 02) [ 34.170574] BadVA : 0000000000000000 [ 34.174161] PrId : 0001b028 (MIPS I6500) [ 34.178183] Process pipe_race (pid: 170, threadinfo=000000005ca35720, task=00000000e1013890, tls=000000014ebbb780) [ 34.188568] Stack : a800000802649400 0000000000000000 0000000000000000 a8000008139ffdd0 [ 34.196623] 0000000000000fba a800000808ee0000 0000000000000001 a8000008130c3e80 [ 34.204676] a8000008080d1280 a8000008139ffd58 a8000008139ffd58 1dbd2b22ea1dd500 [ 34.212729] a800000802649400 a800000808ee0000 ffffffffffffffea 0000000000000001 [ 34.220783] 0000000000001000 0000000000000000 00000001200ae518 ffffffffffffffff [ 34.228836] 000000fffbe0e530 a80000080837edf4 000000fffbe0e530 0000000000000000 [ 34.236890] 0000000000000000 0000000000000000 000000014ebb55a0 0000000000001000 [ 34.244943] 0000000000000001 a800000802649400 0000000000000000 0000000000000000 [ 34.252996] 0000000000000000 0000400400000000 0000000000000000 1dbd2b22ea1dd500 [ 34.261049] 00000000140000e3 a800000802649400 a800000802649400 a800000808ee0000 [ 34.269103] ... [ 34.271568] Call Trace: [ 34.274026] [<a80000080838e01c>] anon_pipe_read+0xd4/0x428 [ 34.279533] [<a80000080837edf4>] vfs_read+0x25c/0x318 [ 34.284607] [<a80000080837faac>] ksys_read+0x104/0x138 [ 34.289763] [<a80000080802b9cc>] syscall_common+0x44/0x68 [ 34.295187] [ 34.296689] Code: f84000cf 02209825 de020010 <dc420000> d8400004 02002825 0040f809 02802025 f84000c3 [ 34.306504] [ 34.308099] ---[ end trace 0000000000000000 ]--- My initial reproducer was the xdp-tools test suite. A standalone reproducer would be an lld/scd loop that, when the read is reordered by the CPU, triggers a fault. We can achieve this from userspace by stressing an anonymous pipe, which uses a mutex. Program used: // SPDX-License-Identifier: GPL-2.0 // pipe_race.c - reproducer for MIPS LL/SC reordering vs fs/pipe.c // // Two userspace processes on an anonymous pipe: // parent = writer: tight write() loop // child = reader: tight read() loop #define _GNU_SOURCE #include <assert.h> #include <errno.h> #include <sched.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f017c2ca8c31a1e135dd87be647096866d6b196
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bbc448c541ed90d52f9ec22f17394304e3bf170e
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/mips/Kconfig"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3f017c2ca8c31a1e135dd87be647096866d6b196",
              "status": "affected",
              "version": "fbe0fae601b780622fcb7034a479fa161645b9f4",
              "versionType": "git"
            },
            {
              "lessThan": "bbc448c541ed90d52f9ec22f17394304e3bf170e",
              "status": "affected",
              "version": "fbe0fae601b780622fcb7034a479fa161645b9f4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/mips/Kconfig"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc4",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmips: select CONFIG_WEAK_REORDERING_BEYOND_LLSC from CONFIG_EYEQ\n\nOn I6500 CPU cores, lld and scd give no ordering guarantees (same as all\nother instructions). To respect the assumption that arch_cmpxchg() is\nfully ordered, we must inject sync instructions above and below our\nlld/scd loops using the already in place WEAK_REORDERING_BEYOND_LLSC\ninfrastructure.\n\nOtherwise, bad things can happen:\n\n[   34.054496] CPU 3 Unable to handle kernel paging request at virtual address 0000000000000000, epc == a80000080838e01c, ra == a80000080838dfc4\n[   34.054559] Oops[#1]:\n[   34.069561] CPU: 3 UID: 0 PID: 170 Comm: pipe_race Not tainted 7.2.0-rc6-01553-gb73c35220968-dirty #103 VOLUNTARY\n[   34.079932] Hardware name: Mobile EyeQ5 MP5 Evaluation board\n[   34.085592] $ 0   : 0000000000000000 0000000000000001 0000000000000000 0000000000000000\n[   34.093616] $ 4   : a800000808ee2618 000000000b7a879d 0000000000001000 0000000000000000\n[   34.101638] $ 8   : 0000000000e3f2c9 0000000000000000 a800000808a2a9f8 0000000000000000\n[   34.109660] $12   : a8000008139ffcd8 ffffffff84080018 a80000080837fae0 7878787878787878\n[   34.117682] $16   : a800000807e82940 0000000000001000 0000000000000000 0000000000000000\n[   34.125704] $20   : a800000802920e00 a8000008139ffdf8 a800000802649400 0000000000e3f2c9\n[   34.133726] $24   : 0000000000000006 00000001200406e0\n[   34.141783] $28   : a8000008139fc000 a8000008139ffd10 0000000000e3f2c8 a80000080838dfc4\n[   34.149837] epc   : a80000080838e01c anon_pipe_read+0xd4/0x428\n[   34.155697] ra    : a80000080838dfc4 anon_pipe_read+0x7c/0x428\n[   34.161549] Status: 140000e3  KX SX UX KERNEL EXL IE\n[   34.166551] Cause : 40800408 (ExcCode 02)\n[   34.170574] BadVA : 0000000000000000\n[   34.174161] PrId  : 0001b028 (MIPS I6500)\n[   34.178183] Process pipe_race (pid: 170, threadinfo=000000005ca35720, task=00000000e1013890, tls=000000014ebbb780)\n[   34.188568] Stack : a800000802649400 0000000000000000 0000000000000000 a8000008139ffdd0\n[   34.196623]\t 0000000000000fba a800000808ee0000 0000000000000001 a8000008130c3e80\n[   34.204676]\t a8000008080d1280 a8000008139ffd58 a8000008139ffd58 1dbd2b22ea1dd500\n[   34.212729]\t a800000802649400 a800000808ee0000 ffffffffffffffea 0000000000000001\n[   34.220783]\t 0000000000001000 0000000000000000 00000001200ae518 ffffffffffffffff\n[   34.228836]\t 000000fffbe0e530 a80000080837edf4 000000fffbe0e530 0000000000000000\n[   34.236890]\t 0000000000000000 0000000000000000 000000014ebb55a0 0000000000001000\n[   34.244943]\t 0000000000000001 a800000802649400 0000000000000000 0000000000000000\n[   34.252996]\t 0000000000000000 0000400400000000 0000000000000000 1dbd2b22ea1dd500\n[   34.261049]\t 00000000140000e3 a800000802649400 a800000802649400 a800000808ee0000\n[   34.269103]\t ...\n[   34.271568] Call Trace:\n[   34.274026] [\u003ca80000080838e01c\u003e] anon_pipe_read+0xd4/0x428\n[   34.279533] [\u003ca80000080837edf4\u003e] vfs_read+0x25c/0x318\n[   34.284607] [\u003ca80000080837faac\u003e] ksys_read+0x104/0x138\n[   34.289763] [\u003ca80000080802b9cc\u003e] syscall_common+0x44/0x68\n[   34.295187]\n[   34.296689] Code: f84000cf  02209825  de020010 \u003cdc420000\u003e d8400004  02002825  0040f809  02802025  f84000c3\n[   34.306504]\n[   34.308099] ---[ end trace 0000000000000000 ]---\n\nMy initial reproducer was the xdp-tools test suite. A standalone\nreproducer would be an lld/scd loop that, when the read is reordered by\nthe CPU, triggers a fault. We can achieve this from userspace by\nstressing an anonymous pipe, which uses a mutex. Program used:\n\n\t// SPDX-License-Identifier: GPL-2.0\n\t// pipe_race.c - reproducer for MIPS LL/SC reordering vs fs/pipe.c\n\t//\n\t// Two userspace processes on an anonymous pipe:\n\t//   parent  = writer: tight write() loop\n\t//   child   = reader: tight read() loop\n\n\t#define _GNU_SOURCE\n\t#include \u003cassert.h\u003e\n\t#include \u003cerrno.h\u003e\n\t#include \u003csched.h\u003e\n\t#include \u003csignal.h\u003e\n\t#include \u003cstdio.h\u003e\n\t#include \u003cstdlib.h\u003e\n\t#include \u003cstring.h\u003e\n\t#include \u003csys/types.h\u003e\n\t#include\n---truncated---"
    }
  ],
  "id": "CVE-2026-98228",
  "lastModified": "2026-10-07T07:17:05.310",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-06T09:18:10.110",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f017c2ca8c31a1e135dd87be647096866d6b196"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bbc448c541ed90d52f9ec22f17394304e3bf170e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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