io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop
In the Linux kernel, the following vulnerability has been resolved: io_uring/io-wq: check IO_WQ_BIT_EXIT inside work run loop Currently this is checked before running the pending work. Normally this is quite fine, as work items either end up blocking (which will create a new worker for other items), or they complete fairly quickly. But syzbot reports an issue where io-wq takes seemingly forever to exit, and with a bit of debugging, this turns out to be because it queues a bunch of big (2GB - 4096b) reads with a /dev/msr* file. Since this file type doesn't support ->read_iter(), loop_rw_iter() ends up handling them. Each read returns 16MB of data read, which takes 20 (!!) seconds. With a bunch of these pending, processing the whole chain can take a long time. Easily longer than the syzbot uninterruptible sleep timeout of 140 seconds. This then triggers a complaint off the io-wq exit path: INFO: task syz.4.135:6326 blocked for more than 143 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.135 state:D stack:26824 pid:6326 tgid:6324 ppid:5957 task_flags:0x400548 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x1139/0x6150 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:6960 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [i
CVE-2026-23113
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-23113
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c60eb049f4a19ddddcd3ee97a9c79ab8066a6a03",
"lessThan": "27e47500fac23d15b7dc93ff650bc4844d2581bd",
"versionType": "git"
},
{
"status": "affected",
"version": "c60eb049f4a19ddddcd3ee97a9c79ab8066a6a03",
"lessThan": "d05d99573f81a091547b1778b9a50120f5d6c68a",
"versionType": "git"
},
{
"status": "affected",
"version": "c60eb049f4a19ddddcd3ee97a9c79ab8066a6a03",
"lessThan": "85eb83694a91c89d9abe615d717c0053c3efa714",
"versionType": "git"
},
{
"status": "affected",
"version": "c60eb049f4a19ddddcd3ee97a9c79ab8066a6a03",
"lessThan": "2e8ca1078b14142db2ce51cbd18ff9971560046b",
"versionType": "git"
},
{
"status": "affected",
"version": "c60eb049f4a19ddddcd3ee97a9c79ab8066a6a03",
"lessThan": "bdf0bf73006ea8af9327cdb85cfdff4c23a5f966",
"versionType": "git"
},
{
"status": "affected",
"version": "c60eb049f4a19ddddcd3ee97a9c79ab8066a6a03",
"lessThan": "10dc959398175736e495f71c771f8641e1ca1907",
"versionType": "git"
}
],
"programFiles": [
"io_uring/io-wq.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.12"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.12",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.122",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.68",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.8",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"io_uring/io-wq.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-23113
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #27203 · Revision 1
- Added to Heist Feed
- Publisher date