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NVD / CVE Program· CNA Linux

CVE-2022-50536: bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data

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: 0.17% (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 113236e8f49f262f318c00ebb14b15f4834e87c1, 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6, 5.10.163.

Low priority for now. Upgrade to Linux Linux 113236e8f49f262f318c00ebb14b15f4834e87c1, 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6, 5.10.163 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 repeated calls to sock_put() when msg has more_data In tcp_bpf_send_verdict() redirection, the eval variable is assigned to __SK_REDIRECT after the apply_bytes data is sent, if msg has more_data, sock_put() will be called multiple times. We should reset the eval variable to __SK_NONE every time more_data starts. This causes: IPv4: Attempt to release TCP socket in state 1 00000000b4c925d7 ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 5 PID: 4482 at lib/refcount.c:25 refcount_warn_saturate+0x7d/0x110 Modules linked in: CPU: 5 PID: 4482 Comm: sockhash_bypass Kdump: loaded Not tainted 6.0.0 #1 Hardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014 Call Trace: <TASK> __tcp_transmit_skb+0xa1b/0xb90 ? __alloc_skb+0x8c/0x1a0 ? __kmalloc_node_track_caller+0x184/0x320 tcp_write_xmit+0x22a/0x1110 __tcp_push_pending_frames+0x32/0xf0 do_tcp_sendpages+0x62d/0x640 tcp_bpf_push+0xae/0x2c0 tcp_bpf_sendmsg_redir+0x260/0x410 ? preempt_count_add+0x70/0xa0 tcp_bpf_send_verdict+0x386/0x4b0 tcp_bpf_sendmsg+0x21b/0x3b0 sock_sendmsg+0x58/0x70 __sys_sendto+0xfa/0x170 ? xfd_validate_state+0x1d/0x80 ? switch_fpu_return+0x59/0xe0 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Oct 7, 2025
Updated
Aug 5, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
7.8
CNA · Linux
7.8
agree

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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Follow CVE-2022-50536

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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 kernel5.4.157 and later · before 5.4.229
  • linux linux kernel5.10.77 and later · before 5.10.163
  • linux linux kernel5.14.16 and later · before 5.15
  • linux linux kernel5.15.1 and later · before 5.15.86
  • linux linux kernel5.16 and later · before 6.0.16
  • linux linux kernel6.1 and later · before 6.1.2
  • linux linux kernel5.15

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

    • 6f226ffe4458ea3b8c33287cb8c86f87dc198dce, 5.15affected
    • 5f0bfe21c853917aae4bc5a70fe57ddb4054443e and later · before 7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10affected · git
    • 15dec6d8f8642a26d6a272af2d7f9877df8f02b8 and later · before 28e4a763cd4a2b1a78852216ef4bd7df3a05cec6affected · git
    • cd9733f5d75c94a32544d6ce5be47e14194cf137 and later · before 8786bde11a4f31b63b3036731df0b47337a7a245affected · git
    • cd9733f5d75c94a32544d6ce5be47e14194cf137 and later · before 578a7628b838a3ac8ad61deaab5a816ff032ac13affected · git
    • cd9733f5d75c94a32544d6ce5be47e14194cf137 and later · before 113236e8f49f262f318c00ebb14b15f4834e87c1affected · git
    • cd9733f5d75c94a32544d6ce5be47e14194cf137 and later · before 7a9841ca025275b5b0edfb0b618934abb6ceec15affected · git
    • 5.4.157 and later · before 5.4.229affected · semver
    • 5.10.77 and later · before 5.10.163affected · semver
    • 5.14.16 and later · before 5.15affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.4-16.1.4-1

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-2022-50533Oct 7, 2025 · wifi: mac80211: mlme: fix null-ptr deref on failed assoc
    22Monitor
  • ← EarlierCVE-2022-50534Oct 7, 2025 · dm thin: Use last transaction's pmd->root when commit failed
    22Monitor
  • Later →CVE-2022-50538Oct 7, 2025 · vme: Fix error not catched in fake_init()
    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 Linux113236e8f49f262f318c00ebb14b15f4834e87c1Vendor (CNA)
Linux Linux28e4a763cd4a2b1a78852216ef4bd7df3a05cec6Vendor (CNA)
Linux Linux5.10.163Vendor (CNA)
Linux Linux5.15Vendor (CNA)
Linux Linux5.4.229Vendor (CNA)
Linux Linux578a7628b838a3ac8ad61deaab5a816ff032ac13Vendor (CNA)
Linux Linux7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10Vendor (CNA)
Linux Linux7a9841ca025275b5b0edfb0b618934abb6ceec15Vendor (CNA)
Linux Linux8786bde11a4f31b63b3036731df0b47337a7a245Vendor (CNA)
debian:linux6.1.4-1 · Debian:12Package 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.

  • CVE-2026-31608199 days apartsmb: server: avoid double-free in smb_direct_free_sendmsg after smb_direct_flush_send_list()
    39Monitor
  • CVE-2026-31609199 days apartsmb: client: avoid double-free in smbd_free_send_io() after smbd_send_batch_flush()
    39Monitor
  • CVE-2026-43011206 days apartnet/x25: Fix potential double free of skb
    39Monitor
  • CVE-2026-43414213 days apartscsi: qla2xxx: Completely fix fcport double free
    39Monitor
  • CVE-2026-52993260 days aparttipc: fix double-free in tipc_buf_append()
    39Monitor
  • CVE-2026-63888285 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
    39Monitor

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-415 · Double Free

CVSS vector

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

nvd-primary

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 (5 more)

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

All records