{"id":"DEBIAN-CVE-2026-98228","details":"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]\t 0000000000000fba a800000808ee0000 0000000000000001 a8000008130c3e80 [   34.204676]\t a8000008080d1280 a8000008139ffd58 a8000008139ffd58 1dbd2b22ea1dd500 [   34.212729]\t a800000802649400 a800000808ee0000 ffffffffffffffea 0000000000000001 [   34.220783]\t 0000000000001000 0000000000000000 00000001200ae518 ffffffffffffffff [   34.228836]\t 000000fffbe0e530 a80000080837edf4 000000fffbe0e530 0000000000000000 [   34.236890]\t 0000000000000000 0000000000000000 000000014ebb55a0 0000000000001000 [   34.244943]\t 0000000000000001 a800000802649400 0000000000000000 0000000000000000 [   34.252996]\t 0000000000000000 0000400400000000 0000000000000000 1dbd2b22ea1dd500 [   34.261049]\t 00000000140000e3 a800000802649400 a800000802649400 a800000808ee0000 [   34.269103]\t ... [   34.271568] Call Trace: [   34.274026] [\u003ca80000080838e01c\u003e] anon_pipe_read+0xd4/0x428 [   34.279533] [\u003ca80000080837edf4\u003e] vfs_read+0x25c/0x318 [   34.284607] [\u003ca80000080837faac\u003e] ksys_read+0x104/0x138 [   34.289763] [\u003ca80000080802b9cc\u003e] syscall_common+0x44/0x68 [   34.295187] [   34.296689] Code: f84000cf  02209825  de020010 \u003cdc420000\u003e 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:  \t// SPDX-License-Identifier: GPL-2.0 \t// pipe_race.c - reproducer for MIPS LL/SC reordering vs fs/pipe.c \t// \t// Two userspace processes on an anonymous pipe: \t//   parent  = writer: tight write() loop \t//   child   = reader: tight read() loop  \t#define _GNU_SOURCE \t#include \u003cassert.h\u003e \t#include \u003cerrno.h\u003e \t#include \u003csched.h\u003e \t#include \u003csignal.h\u003e \t#include \u003cstdio.h\u003e \t#include \u003cstdlib.h\u003e \t#include \u003cstring.h\u003e \t#include \u003csys/types.h\u003e \t#include ---truncated---","modified":"2026-10-08T10:00:56.172382307Z","published":"2026-10-06T09:18:10.110Z","upstream":["CVE-2026-98228"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-98228"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.111-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.10-1","6.18.12-1","6.18.12-1~bpo13+1","6.18.13-1","6.18.14-1","6.18.15-1","6.18.15-1~bpo13+1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1","6.19-1~exp1","6.19.10-1","6.19.10-1~bpo13+1","6.19.11-1","6.19.11-1~bpo13+1","6.19.12-1","6.19.13-1","6.19.13-1~bpo13+1","6.19.14-1","6.19.14-1~bpo13+1","6.19.2-1~exp1","6.19.3-1~exp1","6.19.4-1~exp1","6.19.5-1~exp1","6.19.6-1","6.19.6-2","6.19.6-2~bpo13+1","6.19.8-1","6.19.8-1~bpo13+1","6.19~rc4-1~exp1","6.19~rc5-1~exp1","6.19~rc6-1~exp1","6.19~rc7-1~exp1","6.19~rc8-1~exp1","7.0-1~exp1","7.0.1-1~exp1","7.0.10-1","7.0.10-1~bpo13+1","7.0.12-1","7.0.12-2","7.0.12-2~bpo13+1","7.0.13-1","7.0.13-1~bpo13+1","7.0.14-1","7.0.3-1","7.0.4-1","7.0.4-1~bpo13+1","7.0.7-1","7.0.7-1~bpo13+1","7.0.9-1","7.0.9-1~bpo13+1","7.1.1-1~exp1","7.1.10-1","7.1.12-1","7.1.13-1","7.1.13-1~bpo13+1","7.1.2-1~exp1","7.1.3-1","7.1.3-1+sunvdc","7.1.3-1~bpo13+1","7.1.4-1","7.1.5-1","7.1.6-1","7.1.7-1","7.1.7-1~bpo13+1","7.1.8-1","7.1.8-1~bpo13+1","7.1.8-2","7.1.9-1","7.1.9-1+sparc64","7.1~rc2-1~exp1","7.1~rc3-1~exp1","7.1~rc4-1~exp1","7.1~rc4-1~exp2","7.1~rc5-1~exp1","7.1~rc7-1~exp1","7.2.2-1~exp1","7.2.3-1~exp1","7.2.6-1","7.2.6-1~bpo13+1","7.2.7-1","7.2.8-1","7.2.9-1","7.2~rc3-1~exp1","7.2~rc5-1~exp1","7.2~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not 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