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net/sched: act_api: fix possible infinite loop in tcf_idr_check_alloc()

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

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
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Prerequisites
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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

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Event
#26653 · Revision 1
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