CVE-2026-98228
Full vulnerability record from the local CVENow database.
Description
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---
View original CVE JSON
{
"id": "CVE-2026-98228",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-10-06T09:18:10.110",
"lastModified": "2026-10-19T10:18:23.530",
"vulnStatus": "Received",
"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] [<a80000080838e01c>] anon_pipe_read+0xd4/0x428\n[ 34.279533] [<a80000080837edf4>] vfs_read+0x25c/0x318\n[ 34.284607] [<a80000080837faac>] ksys_read+0x104/0x138\n[ 34.289763] [<a80000080802b9cc>] syscall_common+0x44/0x68\n[ 34.295187]\n[ 34.296689] Code: f84000cf 02209825 de020010 <dc420000> 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 <assert.h>\n\t#include <errno.h>\n\t#include <sched.h>\n\t#include <signal.h>\n\t#include <stdio.h>\n\t#include <stdlib.h>\n\t#include <string.h>\n\t#include <sys/types.h>\n\t#include\n---truncated---"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"arch/mips/Kconfig"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "fbe0fae601b780622fcb7034a479fa161645b9f4",
"lessThan": "3f017c2ca8c31a1e135dd87be647096866d6b196",
"versionType": "git",
"status": "affected"
},
{
"version": "fbe0fae601b780622fcb7034a479fa161645b9f4",
"lessThan": "bbc448c541ed90d52f9ec22f17394304e3bf170e",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"arch/mips/Kconfig"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.11",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.11",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.8",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/3f017c2ca8c31a1e135dd87be647096866d6b196",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/bbc448c541ed90d52f9ec22f17394304e3bf170e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}