NVD / CVE Program· CNA Linux

CVE-2022-48954: s390/qeth: fix use-after-free in hsci

Noroxi assessment

Priority: Monitor (action score 31/100)

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: 0.33% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux bde0dfc7c4569406a6ddeec363d04a1df7b3073f, db6343a5b0d9661f2dd76f653c6d274d38234d2b, ebaaadc332cd21e9df4dcf9ce12552d9354bbbe4.

Low priority for now. Upgrade to Linux Linux bde0dfc7c4569406a6ddeec363d04a1df7b3073f, db6343a5b0d9661f2dd76f653c6d274d38234d2b, ebaaadc332cd21e9df4dcf9ce12552d9354bbbe4 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: s390/qeth: fix use-after-free in hsci KASAN found that addr was dereferenced after br2dev_event_work was freed. ================================================================== BUG: KASAN: use-after-free in qeth_l2_br2dev_worker+0x5ba/0x6b0 Read of size 1 at addr 00000000fdcea440 by task kworker/u760:4/540 CPU: 17 PID: 540 Comm: kworker/u760:4 Tainted: G E 6.1.0-20221128.rc7.git1.5aa3bed4ce83.300.fc36.s390x+kasan #1 Hardware name: IBM 8561 T01 703 (LPAR) Workqueue: 0.0.8000_event qeth_l2_br2dev_worker Call Trace: [<000000016944d4ce>] dump_stack_lvl+0xc6/0xf8 [<000000016942cd9c>] print_address_description.constprop.0+0x34/0x2a0 [<000000016942d118>] print_report+0x110/0x1f8 [<0000000167a7bd04>] kasan_report+0xfc/0x128 [<000000016938d79a>] qeth_l2_br2dev_worker+0x5ba/0x6b0 [<00000001673edd1e>] process_one_work+0x76e/0x1128 [<00000001673ee85c>] worker_thread+0x184/0x1098 [<000000016740718a>] kthread+0x26a/0x310 [<00000001672c606a>] __ret_from_fork+0x8a/0xe8 [<00000001694711da>] ret_from_fork+0xa/0x40 Allocated by task 108338: kasan_save_stack+0x40/0x68 kasan_set_track+0x36/0x48 __kasan_kmalloc+0xa0/0xc0 qeth_l2_switchdev_event+0x25a/0x738 atomic_notifier_call_chain+0x9c/0xf8 br_switchdev_fdb_notify+0xf4/0x110 fdb_notify+0x122/0x180 fdb_add_entry.constprop.0.isra.0+0x312/0x558 br_fdb_add+0x59e/0x858 rtnl_fdb_add+0x58a/0x928 rtnetlink_rcv_msg+0x5f8/0x8d8 netlink_rcv_skb+0x1f2/0x408 netlink_unicast+0x570/0x790 netlink_sendmsg+0x752/0xbe0 sock_sendmsg+0xca/0x110 ____sys_sendmsg+0x510/0x6a8 ___sys_sendmsg+0x12a/0x180 __sys_sendmsg+0xe6/0x168 __do_sys_socketcall+0x3c8/0x468 do_syscall+0x22c/0x328 __do_syscall+0x94/0xf0 system_call+0x82/0xb0 Freed by task 540: kasan_save_stack+0x40/0x68 kasan_set_track+0x36/0x48 kasan_save_free_info+0x4c/0x68 ____kasan_slab_free+0x14e/0x1a8 __kasan_slab_free+0x24/0x30 __kmem_cache_free+0x168/0x338 qeth_l2_br2dev_worker+0x154/0x6b0 process_one_work+0x76e/0x1128 worker_thread+0x184/0x1098 kthread+0x26a/0x310 __ret_from_fork+0x8a/0xe8 ret_from_fork+0xa/0x40 Last potentially related work creation: kasan_save_stack+0x40/0x68 __kasan_record_aux_stack+0xbe/0xd0 insert_work+0x56/0x2e8 __queue_work+0x4ce/0xd10 queue_work_on+0xf4/0x100 qeth_l2_switchdev_event+0x520/0x738 atomic_notifier_call_chain+0x9c/0xf8 br_switchdev_fdb_notify+0xf4/0x110 fdb_notify+0x122/0x180 fdb_add_entry.constprop.0.isra.0+0x312/0x558 br_fdb_add+0x59e/0x858 rtnl_fdb_add+0x58a/0x928 rtnetlink_rcv_msg+0x5f8/0x8d8 netlink_rcv_skb+0x1f2/0x408 netlink_unicast+0x570/0x790 netlink_sendmsg+0x752/0xbe0 sock_sendmsg+0xca/0x110 ____sys_sendmsg+0x510/0x6a8 ___sys_sendmsg+0x12a/0x180 __sys_sendmsg+0xe6/0x168 __do_sys_socketcall+0x3c8/0x468 do_syscall+0x22c/0x328 __do_syscall+0x94/0xf0 system_call+0x82/0xb0 Second to last potentially related work creation: kasan_save_stack+0x40/0x68 __kasan_record_aux_stack+0xbe/0xd0 kvfree_call_rcu+0xb2/0x760 kernfs_unlink_open_file+0x348/0x430 kernfs_fop_release+0xc2/0x320 __fput+0x1ae/0x768 task_work_run+0x1bc/0x298 exit_to_user_mode_prepare+0x1a0/0x1a8 __do_syscall+0x94/0xf0 system_call+0x82/0xb0 The buggy address belongs to the object at 00000000fdcea400 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of 96-byte region [00000000fdcea400, 00000000fdcea460) The buggy address belongs to the physical page: page:000000005a9c26e8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfdcea flags: 0x3ffff00000000200(slab|node=0|zone=1|lastcpupid=0x1ffff) raw: 3ffff00000000200 0000000000000000 0000000100000122 000000008008cc00 raw: 0000000000000000 0020004100000000 ffffffff00000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: 00000000fdcea300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc 00000000fdcea380: fb fb fb fb fb fb f ---truncated---

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: Oct 21, 2024
Updated: Aug 5, 2026
EPSS: 0.3% · 26th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 8.8; 1.0 point gap

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

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

Get told when this record changes

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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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel5.15 and later · before 5.15.83
linux linux kernel5.16 and later · before 6.0.13
linux linux kernel6.1

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
- 5.15affected
- f7936b7b2663c99a096a5c432ba96ab1e91a6c0f and later · before db6343a5b0d9661f2dd76f653c6d274d38234d2baffected · git
- f7936b7b2663c99a096a5c432ba96ab1e91a6c0f and later · before bde0dfc7c4569406a6ddeec363d04a1df7b3073faffected · git
- f7936b7b2663c99a096a5c432ba96ab1e91a6c0f and later · before ebaaadc332cd21e9df4dcf9ce12552d9354bbbe4affected · git
- before 5.15not affected · semver
- 5.15.83 and later · up to and including 5.15.*not affected · semver
- 6.0.13 and later · up to and including 6.0.*not affected · semver
- 6.1 and laternot affected · original_commit_for_fix

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.4-1	6.1.4-1
openSUSE:Leap 15.5	kernel-azure	before 5.14.21-150500.33.72.1	5.14.21-150500.33.72.1
openSUSE:Leap 15.5	kernel-rt_debug	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
openSUSE:Leap 15.5	kernel-source-azure	before 5.14.21-150500.33.72.1	5.14.21-150500.33.72.1
openSUSE:Leap 15.5	kernel-source-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
openSUSE:Leap 15.5	kernel-syms-azure	before 5.14.21-150500.33.72.1	5.14.21-150500.33.72.1
openSUSE:Leap 15.5	kernel-syms-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
openSUSE:Leap Micro 5.5	kernel-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-64kb	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-docs	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-obs-build	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-source	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	kernel-syms	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise Live Patching 15 SP4	kernel-livepatch-SLE15-SP4_Update_33	before 1-150400.9.5.1	1-150400.9.5.1
SUSE:Linux Enterprise Live Patching 15 SP5	kernel-livepatch-SLE15-SP5_Update_21	before 1-150500.11.5.1	1-150500.11.5.1
SUSE:Linux Enterprise Live Patching 15 SP5	kernel-livepatch-SLE15-SP5-RT_Update_22	before 1-150500.11.3.1	1-150500.11.3.1
SUSE:Linux Enterprise Micro 5.3	kernel-default	before 5.14.21-150400.24.141.1	5.14.21-150400.24.141.1
SUSE:Linux Enterprise Micro 5.3	kernel-default-base	before 5.14.21-150400.24.141.1.150400.24.68.2	5.14.21-150400.24.141.1.150400.24.68.2
SUSE:Linux Enterprise Micro 5.3	kernel-rt	before 5.14.21-150400.15.100.1	5.14.21-150400.15.100.1
SUSE:Linux Enterprise Micro 5.3	kernel-source-rt	before 5.14.21-150400.15.100.1	5.14.21-150400.15.100.1
SUSE:Linux Enterprise Micro 5.5	kernel-default	before 5.14.21-150500.55.88.1	5.14.21-150500.55.88.1
SUSE:Linux Enterprise Micro 5.5	kernel-default-base	before 5.14.21-150500.55.88.1.150500.6.39.4	5.14.21-150500.55.88.1.150500.6.39.4
SUSE:Linux Enterprise Micro 5.5	kernel-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1
SUSE:Linux Enterprise Micro 5.5	kernel-source-rt	before 5.14.21-150500.13.76.1	5.14.21-150500.13.76.1

+12

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
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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-2022-48952Oct 21, 2024 · PCI: mt7621: Add sentinel to quirks table
22Monitor
← EarlierCVE-2022-48953Oct 21, 2024 · rtc: cmos: Fix event handler registration ordering issue
22Monitor
Later →CVE-2022-48955Oct 21, 2024 · net: thunderbolt: fix memory leak in tbnet_open()
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 / package	Fixed version	Source
Linux Linux	bde0dfc7c4569406a6ddeec363d04a1df7b3073f	Vendor (CNA)
Linux Linux	db6343a5b0d9661f2dd76f653c6d274d38234d2b	Vendor (CNA)
Linux Linux	ebaaadc332cd21e9df4dcf9ce12552d9354bbbe4	Vendor (CNA)
debian:linux	6.1.4-1 · Debian:12	Package registry (OSV)
opensuse:kernel-azure	5.14.21-150500.33.72.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-rt	5.14.21-150500.13.76.1 · openSUSE:Leap Micro 5.5	Package registry (OSV)
opensuse:kernel-rt_debug	5.14.21-150500.13.76.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-source-azure	5.14.21-150500.33.72.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-source-rt	5.14.21-150500.13.76.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-syms-azure	5.14.21-150500.33.72.1 · openSUSE:Leap 15.5	Package registry (OSV)
opensuse:kernel-syms-rt	5.14.21-150500.13.76.1 · openSUSE:Leap 15.5	Package registry (OSV)
suse:kernel-64kb	5.14.21-150400.24.141.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	Package registry (OSV)
suse:kernel-azure	5.14.21-150500.33.72.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5	Package registry (OSV)
suse:kernel-default	5.14.21-150400.24.141.1 · SUSE:Linux Enterprise Micro 5.3	Package registry (OSV)
suse:kernel-default-base	5.14.21-150400.24.141.1.150400.24.68.2 · SUSE:Linux Enterprise Micro 5.3	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP4_Update_33	1-150400.9.5.1 · SUSE:Linux Enterprise Live Patching 15 SP4	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP5-RT_Update_22	1-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5	Package registry (OSV)
suse:kernel-rt	5.14.21-150500.13.76.1 · SUSE:Linux Enterprise Micro 5.5	Package registry (OSV)
suse:kernel-rt_debug	5.14.21-150500.13.76.1 · SUSE:Real Time Module 15 SP5	Package registry (OSV)
suse:kernel-source-azure	5.14.21-150500.33.72.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5	Package registry (OSV)
suse:kernel-source-rt	5.14.21-150500.13.76.1 · SUSE:Linux Enterprise Micro 5.5	Package registry (OSV)
suse:kernel-syms-azure	5.14.21-150500.33.72.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP5	Package registry (OSV)
suse:kernel-syms-rt	5.14.21-150500.13.76.1 · SUSE:Real Time Module 15 SP5	Package 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 with local access to the system can trigger it.
A low-privileged account is enough.
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: Local
Attack complexity: Low
Privileges required: Low
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

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

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&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

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/bde0dfc7c4569406a6ddeec363d04a1df7b3073f

Show all references (2 more)

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

All records