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NVD / CVE Program· CNA Linux

CVE-2023-54112: kcm: Fix memory leak in error path of kcm_sendmsg()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 16989de75497574b5fafd174c0c233d5a86858b7, 33db24ad811b3576a0c2f8862506763f2be925b0, 479c71cda14b3c3a6515773faa39055333eaa2b7.

Low priority for now. Upgrade to Linux Linux 16989de75497574b5fafd174c0c233d5a86858b7, 33db24ad811b3576a0c2f8862506763f2be925b0, 479c71cda14b3c3a6515773faa39055333eaa2b7 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: kcm: Fix memory leak in error path of kcm_sendmsg() syzbot reported a memory leak like below: BUG: memory leak unreferenced object 0xffff88810b088c00 (size 240): comm "syz-executor186", pid 5012, jiffies 4294943306 (age 13.680s) hex dump (first 32 bytes): 00 89 08 0b 81 88 ff ff 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff83e5d5ff>] __alloc_skb+0x1ef/0x230 net/core/skbuff.c:634 [<ffffffff84606e59>] alloc_skb include/linux/skbuff.h:1289 [inline] [<ffffffff84606e59>] kcm_sendmsg+0x269/0x1050 net/kcm/kcmsock.c:815 [<ffffffff83e479c6>] sock_sendmsg_nosec net/socket.c:725 [inline] [<ffffffff83e479c6>] sock_sendmsg+0x56/0xb0 net/socket.c:748 [<ffffffff83e47f55>] ____sys_sendmsg+0x365/0x470 net/socket.c:2494 [<ffffffff83e4c389>] ___sys_sendmsg+0xc9/0x130 net/socket.c:2548 [<ffffffff83e4c536>] __sys_sendmsg+0xa6/0x120 net/socket.c:2577 [<ffffffff84ad7bb8>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff84ad7bb8>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd In kcm_sendmsg(), kcm_tx_msg(head)->last_skb is used as a cursor to append newly allocated skbs to 'head'. If some bytes are copied, an error occurred, and jumped to out_error label, 'last_skb' is left unmodified. A later kcm_sendmsg() will use an obsoleted 'last_skb' reference, corrupting the 'head' frag_list and causing the leak. This patch fixes this issue by properly updating the last allocated skb in 'last_skb'.

—No exploit Fix available
Published
Dec 24, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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Noroxi analysis

What does it mean in your environment?

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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.

—

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

    • 4.6affected
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before 8dc7eb757b1652b82725f32e0c89a1e9f6c0e13baffected · git
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before 5e5554389397e98fafb9efe395d8b4830dd5f042affected · git
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before 479c71cda14b3c3a6515773faa39055333eaa2b7affected · git
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before 33db24ad811b3576a0c2f8862506763f2be925b0affected · git
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before 97275339c34cfbccd65e87bc38fd910ae66c48baaffected · git
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before 16989de75497574b5fafd174c0c233d5a86858b7affected · git
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before af8085e0fc3207ecbf8b9e7a635c790e36d058c6affected · git
    • ab7ac4eb9832e32a09f4e8042705484d2fb0aad3 and later · before c821a88bd720b0046433173185fd841a100d44adaffected · git
    • before 4.6not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.55-16.1.55-1
Debian:13linuxbefore 6.5.6-16.5.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2023-54110Dec 24, 2025 · usb: rndis_host: Secure rndis_query check against int overflow
    0Monitor
  • ← EarlierCVE-2023-54111Dec 24, 2025 · pinctrl: rockchip: Fix refcount leak in rockchip_pinctrl_parse_groups
    0Monitor
  • Later →CVE-2023-54113Dec 24, 2025 · rcu: dump vmalloc memory info safely
    0Monitor

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 Linux16989de75497574b5fafd174c0c233d5a86858b7Vendor (CNA)
Linux Linux33db24ad811b3576a0c2f8862506763f2be925b0Vendor (CNA)
Linux Linux479c71cda14b3c3a6515773faa39055333eaa2b7Vendor (CNA)
Linux Linux5e5554389397e98fafb9efe395d8b4830dd5f042Vendor (CNA)
Linux Linux8dc7eb757b1652b82725f32e0c89a1e9f6c0e13bVendor (CNA)
Linux Linux97275339c34cfbccd65e87bc38fd910ae66c48baVendor (CNA)
Linux Linuxaf8085e0fc3207ecbf8b9e7a635c790e36d058c6Vendor (CNA)
Linux Linuxc821a88bd720b0046433173185fd841a100d44adVendor (CNA)
debian:linux6.1.55-1 · 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.

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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References

Show all references (7 more)

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

All records