NVD / CVE Program· CNA Linux

CVE-2026-43016: bpf: sockmap: Fix use-after-free of sk->sk_socket in sk_psock_verdict_data_ready().

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: 0.12% (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 18861f87a043e78b1f901cae4237e755ed7ef095, 68187f18a89be4b6237d28ae1313b5adf76238c6, 8d597e3e74027900ffa81b8ff47ab51999a3e110.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 18861f87a043e78b1f901cae4237e755ed7ef095, 68187f18a89be4b6237d28ae1313b5adf76238c6, 8d597e3e74027900ffa81b8ff47ab51999a3e110 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: bpf: sockmap: Fix use-after-free of sk->sk_socket in sk_psock_verdict_data_ready(). syzbot reported use-after-free of AF_UNIX socket's sk->sk_socket in sk_psock_verdict_data_ready(). [0] In unix_stream_sendmsg(), the peer socket's ->sk_data_ready() is called after dropping its unix_state_lock(). Although the sender socket holds the peer's refcount, it does not prevent the peer's sock_orphan(), and the peer's sk_socket might be freed after one RCU grace period. Let's fetch the peer's sk->sk_socket and sk->sk_socket->ops under RCU in sk_psock_verdict_data_ready(). [0]: BUG: KASAN: slab-use-after-free in sk_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278 Read of size 8 at addr ffff8880594da860 by task syz.4.1842/11013 CPU: 1 UID: 0 PID: 11013 Comm: syz.4.1842 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: <TASK> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 sk_psock_verdict_data_ready+0xec/0x590 net/core/skmsg.c:1278 unix_stream_sendmsg+0x8a3/0xe80 net/unix/af_unix.c:2482 sock_sendmsg_nosec net/socket.c:721 [inline] __sock_sendmsg net/socket.c:736 [inline] ____sys_sendmsg+0x972/0x9f0 net/socket.c:2585 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2639 __sys_sendmsg net/socket.c:2671 [inline] __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2674 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7facf899c819 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007facf9827028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007facf8c15fa0 RCX: 00007facf899c819 RDX: 0000000000000000 RSI: 0000200000000500 RDI: 0000000000000004 RBP: 00007facf8a32c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007facf8c16038 R14: 00007facf8c15fa0 R15: 00007ffd41b01c78 </TASK> Allocated by task 11013: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] kmem_cache_alloc_lru_noprof+0x2b8/0x640 mm/slub.c:4885 sock_alloc_inode+0x28/0xc0 net/socket.c:316 alloc_inode+0x6a/0x1b0 fs/inode.c:347 new_inode_pseudo include/linux/fs.h:3003 [inline] sock_alloc net/socket.c:631 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1562 sock_create net/socket.c:1656 [inline] __sys_socketpair+0x1c4/0x560 net/socket.c:1803 __do_sys_socketpair net/socket.c:1856 [inline] __se_sys_socketpair net/socket.c:1853 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1853 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 15: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2685 [inline] slab_free mm/slub.c:6165 [inline] kmem_cache_free+0x187/0x630 mm/slub.c:6295 rcu_do_batch kernel/rcu/tree.c: ---truncated---

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 1, 2026
Updated: Oct 30, 2026
EPSS: 0.1% · 2th 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 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; 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.

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 6.6.134
linux linux kernel6.7 and later · before 6.12.81
linux linux kernel6.13 and later · before 6.18.22
linux linux kernel6.19 and later · before 6.19.12
linux linux kernel7.0

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
- c63829182c37c2d6d0608976d15fa61ebebe9e6b and later · before ac9f092e9994cada106432d5070e28ee9cb2fdacaffected · git
- c63829182c37c2d6d0608976d15fa61ebebe9e6b and later · before 8d597e3e74027900ffa81b8ff47ab51999a3e110affected · git
- c63829182c37c2d6d0608976d15fa61ebebe9e6b and later · before 68187f18a89be4b6237d28ae1313b5adf76238c6affected · git
- c63829182c37c2d6d0608976d15fa61ebebe9e6b and later · before 18861f87a043e78b1f901cae4237e755ed7ef095affected · git
- c63829182c37c2d6d0608976d15fa61ebebe9e6b and later · before af95bc39a83d82ae6ad253986335037256888b3faffected · git
- c63829182c37c2d6d0608976d15fa61ebebe9e6b and later · before ad8391d37f334ee73ba91926f8b4e4cf6d31ea04affected · git
- before 5.15not affected · semver
- 6.1.191 and later · up to and including 6.1.*not affected · semver
- 6.6.134 and later · up to and including 6.6.*not affected · semver

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	from 0	—
Debian:13	linux	before 6.12.85-1	6.12.85-1
Debian:14	linux	before 6.19.12-1	6.19.12-1
SUSE:Linux Enterprise Live Patching 15 SP7	kernel-livepatch-SLE15-SP7_Update_20	before 1-150700.15.3.2	1-150700.15.3.2
SUSE:Linux Enterprise Live Patching 15 SP7	kernel-livepatch-SLE15-SP7-RT_Update_19	before 1-150700.1.5.1	1-150700.1.5.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-64kb	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-default	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-default-base	before 6.4.0-150700.53.78.1.150700.17.43.2	6.4.0-150700.53.78.1.150700.17.43.2
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-source	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7	kernel-zfcpdump	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7	kernel-docs	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7	kernel-obs-build	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7	kernel-syms	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP7	kernel-azure	before 6.4.0-150700.53.78.1	6.4.0-150700.53.78.1
SUSE:Real Time Module 15 SP7	kernel-rt	before 6.4.0-150700.7.72.1	6.4.0-150700.7.72.1
SUSE:Real Time Module 15 SP7	kernel-source-rt	before 6.4.0-150700.7.72.1	6.4.0-150700.7.72.1
SUSE:Real Time Module 15 SP7	kernel-syms-rt	before 6.4.0-150700.7.72.1	6.4.0-150700.7.72.1

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-2026-43012May 1, 2026 · net/mlx5: Fix switchdev mode rollback in case of failure
22Monitor
← EarlierCVE-2026-43013May 1, 2026 · net/mlx5: lag: Check for LAG device before creating debugfs
22Monitor
Later →CVE-2026-43017May 1, 2026 · Bluetooth: MGMT: validate mesh send advertising payload length
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	18861f87a043e78b1f901cae4237e755ed7ef095	Vendor (CNA)
Linux Linux	68187f18a89be4b6237d28ae1313b5adf76238c6	Vendor (CNA)
Linux Linux	8d597e3e74027900ffa81b8ff47ab51999a3e110	Vendor (CNA)
Linux Linux	ac9f092e9994cada106432d5070e28ee9cb2fdac	Vendor (CNA)
Linux Linux	ad8391d37f334ee73ba91926f8b4e4cf6d31ea04	Vendor (CNA)
Linux Linux	af95bc39a83d82ae6ad253986335037256888b3f	Vendor (CNA)
debian:linux	6.12.85-1 · Debian:13	Package registry (OSV)
suse:kernel-64kb	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-azure	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP7	Package registry (OSV)
suse:kernel-default	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-default-base	6.4.0-150700.53.78.1.150700.17.43.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-docs	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_20	1-150700.15.3.2 · SUSE:Linux Enterprise Live Patching 15 SP7	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7-RT_Update_19	1-150700.1.5.1 · SUSE:Linux Enterprise Live Patching 15 SP7	Package registry (OSV)
suse:kernel-obs-build	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7	Package registry (OSV)
suse:kernel-rt	6.4.0-150700.7.72.1 · SUSE:Real Time Module 15 SP7	Package registry (OSV)
suse:kernel-source	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	Package registry (OSV)
suse:kernel-syms	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7	Package registry (OSV)
suse:kernel-zfcpdump	6.4.0-150700.53.78.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7	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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0143 · May 4, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

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-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

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

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/18861f87a043e78b1f901cae4237e755ed7ef095

Show all references (5 more)

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

All records