net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()
In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc() syzbot found hanging tasks waiting on rtnl_lock [1] A reproducer is available in the syzbot bug. When a request to add multiple actions with the same index is sent, the second request will block forever on the first request. This holds rtnl_lock, and causes tasks to hang. Return -EAGAIN to prevent infinite looping, while keeping documented behavior. [1] INFO: task kworker/1:0:5088 blocked for more than 143 seconds. Not tainted 6.9.0-rc4-syzkaller-00173-g3cdb45594619 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:0 state:D stack:23744 pid:5088 tgid:5088 ppid:2 flags:0x00004000 Workqueue: events_power_efficient reg_check_chans_work Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6838 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wiphy_lock include/net/cfg80211.h:5953 [inline] reg_leave_invalid_chans net/wireless/reg.c:2466 [inline] reg_check_chans_work+0x10a/0x10e0 net/wireless/reg.c:2481
CVE-2024-40995
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-2024-40995
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": "0190c1d452a91c38a3462abdd81752be1b9006a8",
"lessThan": "0d8a2d287c8a394c0d4653f0c6c7be4c688e5a74",
"versionType": "git"
},
{
"status": "affected",
"version": "0190c1d452a91c38a3462abdd81752be1b9006a8",
"lessThan": "c6a7da65a296745535a964be1019ec7691b0cb90",
"versionType": "git"
},
{
"status": "affected",
"version": "0190c1d452a91c38a3462abdd81752be1b9006a8",
"lessThan": "25987a97eec4d5f897cd04ee1b45170829c610da",
"versionType": "git"
},
{
"status": "affected",
"version": "0190c1d452a91c38a3462abdd81752be1b9006a8",
"lessThan": "6fc78d67f51aeb9a542d39a8714e16bc411582d4",
"versionType": "git"
},
{
"status": "affected",
"version": "0190c1d452a91c38a3462abdd81752be1b9006a8",
"lessThan": "5f926aa96b08b6c47178fe1171e7ae331c695fc2",
"versionType": "git"
},
{
"status": "affected",
"version": "0190c1d452a91c38a3462abdd81752be1b9006a8",
"lessThan": "7a0e497b597df7c4cf2b63fc6e9188b6cabe5335",
"versionType": "git"
},
{
"status": "affected",
"version": "0190c1d452a91c38a3462abdd81752be1b9006a8",
"lessThan": "d864319871b05fadd153e0aede4811ca7008f5d6",
"versionType": "git"
}
],
"programFiles": [
"net/sched/act_api.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.4.279",
"versionType": "semver",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.221",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.162",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.96",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.36",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.9.7",
"versionType": "semver",
"lessThanOrEqual": "6.9.*"
},
{
"status": "unaffected",
"version": "6.10",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sched/act_api.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2024-40995
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #26653 · Revision 1
- Added to Heist Feed
- Publisher date