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NVD / CVE Program· CNA Linux

CVE-2022-49328: mt76: fix use-after-free by removing a non-RCU wcid pointer

Noroxi assessment

Priority: Monitor (action score 35/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.42% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 4448327b41738dbfcda680eb4935ff835568f468, 51fb1278aa57ae0fc54adaa786e1965362bed4fb, d5f77f1dbb59feae81f88e44551e8e1d8a802d9a.

Low priority for now. Upgrade to Linux Linux 4448327b41738dbfcda680eb4935ff835568f468, 51fb1278aa57ae0fc54adaa786e1965362bed4fb, d5f77f1dbb59feae81f88e44551e8e1d8a802d9a or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: mt76: fix use-after-free by removing a non-RCU wcid pointer Fixes an issue caught by KASAN about use-after-free in mt76_txq_schedule by protecting mtxq->wcid with rcu_lock between mt76_txq_schedule and sta_info_[alloc, free]. [18853.876689] ================================================================== [18853.876751] BUG: KASAN: use-after-free in mt76_txq_schedule+0x204/0xaf8 [mt76] [18853.876773] Read of size 8 at addr ffffffaf989a2138 by task mt76-tx phy0/883 [18853.876786] [18853.876810] CPU: 5 PID: 883 Comm: mt76-tx phy0 Not tainted 5.10.100-fix-510-56778d365941-kasan #5 0b01fbbcf41a530f52043508fec2e31a4215 [18853.876840] Call trace: [18853.876861] dump_backtrace+0x0/0x3ec [18853.876878] show_stack+0x20/0x2c [18853.876899] dump_stack+0x11c/0x1ac [18853.876918] print_address_description+0x74/0x514 [18853.876934] kasan_report+0x134/0x174 [18853.876948] __asan_report_load8_noabort+0x44/0x50 [18853.876976] mt76_txq_schedule+0x204/0xaf8 [mt76 074e03e4640e97fe7405ee1fab547b81c4fa45d2] [18853.877002] mt76_txq_schedule_all+0x2c/0x48 [mt76 074e03e4640e97fe7405ee1fab547b81c4fa45d2] [18853.877030] mt7921_tx_worker+0xa0/0x1cc [mt7921_common f0875ebac9d7b4754e1010549e7db50fbd90a047] [18853.877054] __mt76_worker_fn+0x190/0x22c [mt76 074e03e4640e97fe7405ee1fab547b81c4fa45d2] [18853.877071] kthread+0x2f8/0x3b8 [18853.877087] ret_from_fork+0x10/0x30 [18853.877098] [18853.877112] Allocated by task 941: [18853.877131] kasan_save_stack+0x38/0x68 [18853.877147] __kasan_kmalloc+0xd4/0xfc [18853.877163] kasan_kmalloc+0x10/0x1c [18853.877177] __kmalloc+0x264/0x3c4 [18853.877294] sta_info_alloc+0x460/0xf88 [mac80211] [18853.877410] ieee80211_prep_connection+0x204/0x1ee0 [mac80211] [18853.877523] ieee80211_mgd_auth+0x6c4/0xa4c [mac80211] [18853.877635] ieee80211_auth+0x20/0x2c [mac80211] [18853.877733] rdev_auth+0x7c/0x438 [cfg80211] [18853.877826] cfg80211_mlme_auth+0x26c/0x390 [cfg80211] [18853.877919] nl80211_authenticate+0x6d4/0x904 [cfg80211] [18853.877938] genl_rcv_msg+0x748/0x93c [18853.877954] netlink_rcv_skb+0x160/0x2a8 [18853.877969] genl_rcv+0x3c/0x54 [18853.877985] netlink_unicast_kernel+0x104/0x1ec [18853.877999] netlink_unicast+0x178/0x268 [18853.878015] netlink_sendmsg+0x3cc/0x5f0 [18853.878030] sock_sendmsg+0xb4/0xd8 [18853.878043] ____sys_sendmsg+0x2f8/0x53c [18853.878058] ___sys_sendmsg+0xe8/0x150 [18853.878071] __sys_sendmsg+0xc4/0x1f4 [18853.878087] __arm64_compat_sys_sendmsg+0x88/0x9c [18853.878101] el0_svc_common+0x1b4/0x390 [18853.878115] do_el0_svc_compat+0x8c/0xdc [18853.878131] el0_svc_compat+0x10/0x1c [18853.878146] el0_sync_compat_handler+0xa8/0xcc [18853.878161] el0_sync_compat+0x188/0x1c0 [18853.878171] [18853.878183] Freed by task 10927: [18853.878200] kasan_save_stack+0x38/0x68 [18853.878215] kasan_set_track+0x28/0x3c [18853.878228] kasan_set_free_info+0x24/0x48 [18853.878244] __kasan_slab_free+0x11c/0x154 [18853.878259] kasan_slab_free+0x14/0x24 [18853.878273] slab_free_freelist_hook+0xac/0x1b0 [18853.878287] kfree+0x104/0x390 [18853.878402] sta_info_free+0x198/0x210 [mac80211] [18853.878515] __sta_info_destroy_part2+0x230/0x2d4 [mac80211] [18853.878628] __sta_info_flush+0x300/0x37c [mac80211] [18853.878740] ieee80211_set_disassoc+0x2cc/0xa7c [mac80211] [18853.878851] ieee80211_mgd_deauth+0x4a4/0x10a0 [mac80211] [18853.878962] ieee80211_deauth+0x20/0x2c [mac80211] [18853.879057] rdev_deauth+0x7c/0x438 [cfg80211] [18853.879150] cfg80211_mlme_deauth+0x274/0x414 [cfg80211] [18853.879243] cfg80211_mlme_down+0xe4/0x118 [cfg80211] [18853.879335] cfg80211_disconnect+0x218/0x2d8 [cfg80211] [18853.879427] __cfg80211_leave+0x17c/0x240 [cfg80211] [18853.879519] cfg80211_leave+0x3c/0x58 [cfg80211] [18853.879611] wiphy_suspend+0xdc/0x200 [cfg80211] [18853.879628] dpm_run_callback+0x58/0x408 [18853.879642] __device_suspend+0x4cc/0x864 [18853.879658] async_suspend+0x34/0xf4 [18 ---truncated---

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Aug 15, 2026
EPSS
0.4% · 36th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 5.15.58
  • linux linux kernel5.16 and later · before 5.17.14
  • linux linux kernel5.18 and later · before 5.18.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.2affected
    • 90fdc1717b1862eb3d506733f3b3e5217bc0de20 and later · before 4448327b41738dbfcda680eb4935ff835568f468affected · git
    • 90fdc1717b1862eb3d506733f3b3e5217bc0de20 and later · before e55bcdd0bf34a8b10d45ce80ebb3164c5292a17daffected · git
    • 90fdc1717b1862eb3d506733f3b3e5217bc0de20 and later · before d5f77f1dbb59feae81f88e44551e8e1d8a802d9aaffected · git
    • 90fdc1717b1862eb3d506733f3b3e5217bc0de20 and later · before 51fb1278aa57ae0fc54adaa786e1965362bed4fbaffected · git
    • before 5.2not affected · semver
    • 5.15.58 and later · up to and including 5.15.*not affected · semver
    • 5.17.14 and later · up to and including 5.17.*not affected · semver
    • 5.18.3 and later · up to and including 5.18.*not affected · semver
    • 5.19 and laternot affected · original_commit_for_fix

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.18.5-15.18.5-1
Red Hat:rhel_aus:8.2::baseosbpftoolbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseosbpftool-debuginfobefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernelbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-abi-whitelistsbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-corebefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debugbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-corebefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-debuginfobefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-develbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-modulesbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debug-modules-extrabefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debuginfobefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-debuginfo-common-x86_64before 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-develbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-docbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-modulesbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-modules-extrabefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-toolsbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-tools-debuginfobefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseoskernel-tools-libsbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseosperfbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseosperf-debuginfobefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2
Red Hat:rhel_aus:8.2::baseospython3-perfbefore 0:4.18.0-193.156.1.el8_20:4.18.0-193.156.1.el8_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2022-49326Feb 26, 2025 · rtl818x: Prevent using not initialized queues
    22Monitor
  • ← EarlierCVE-2022-49327Feb 26, 2025 · bcache: avoid journal no-space deadlock by reserving 1 journal bucket
    22Monitor
  • Later →CVE-2022-49329Feb 26, 2025 · vduse: Fix NULL pointer dereference on sysfs access
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux4448327b41738dbfcda680eb4935ff835568f468Vendor (CNA)
Linux Linux51fb1278aa57ae0fc54adaa786e1965362bed4fbVendor (CNA)
Linux Linuxd5f77f1dbb59feae81f88e44551e8e1d8a802d9aVendor (CNA)
Linux Linuxe55bcdd0bf34a8b10d45ce80ebb3164c5292a17dVendor (CNA)
debian:linux5.18.5-1 · Debian:12Package registry (OSV)
red hat:bpftool0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:bpftool-debuginfo0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-core0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-core0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-devel0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-modules0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debug-modules-extra0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)
red hat:kernel-debuginfo0:4.18.0-193.156.1.el8_2 · Red Hat:rhel_aus:8.2::baseosPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records