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NVD / CVE Program· CNA Linux

CVE-2023-52977: net: openvswitch: fix flow memory leak in ovs_flow_cmd_new

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.26% (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 0c598aed445eb45b0ee7ba405f7ece99ee349c30, 1ac653cf886cdfc082708c82dc6ac6115cebd2ee, 4.10.

Low priority for now. Upgrade to Linux Linux 0c598aed445eb45b0ee7ba405f7ece99ee349c30, 1ac653cf886cdfc082708c82dc6ac6115cebd2ee, 4.10 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: net: openvswitch: fix flow memory leak in ovs_flow_cmd_new Syzkaller reports a memory leak of new_flow in ovs_flow_cmd_new() as it is not freed when an allocation of a key fails. BUG: memory leak unreferenced object 0xffff888116668000 (size 632): comm "syz-executor231", pid 1090, jiffies 4294844701 (age 18.871s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 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: [<00000000defa3494>] kmem_cache_zalloc include/linux/slab.h:654 [inline] [<00000000defa3494>] ovs_flow_alloc+0x19/0x180 net/openvswitch/flow_table.c:77 [<00000000c67d8873>] ovs_flow_cmd_new+0x1de/0xd40 net/openvswitch/datapath.c:957 [<0000000010a539a8>] genl_family_rcv_msg_doit+0x22d/0x330 net/netlink/genetlink.c:739 [<00000000dff3302d>] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] [<00000000dff3302d>] genl_rcv_msg+0x328/0x590 net/netlink/genetlink.c:800 [<000000000286dd87>] netlink_rcv_skb+0x153/0x430 net/netlink/af_netlink.c:2515 [<0000000061fed410>] genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 [<000000009dc0f111>] netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] [<000000009dc0f111>] netlink_unicast+0x545/0x7f0 net/netlink/af_netlink.c:1339 [<000000004a5ee816>] netlink_sendmsg+0x8e7/0xde0 net/netlink/af_netlink.c:1934 [<00000000482b476f>] sock_sendmsg_nosec net/socket.c:651 [inline] [<00000000482b476f>] sock_sendmsg+0x152/0x190 net/socket.c:671 [<00000000698574ba>] ____sys_sendmsg+0x70a/0x870 net/socket.c:2356 [<00000000d28d9e11>] ___sys_sendmsg+0xf3/0x170 net/socket.c:2410 [<0000000083ba9120>] __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439 [<00000000c00628f8>] do_syscall_64+0x30/0x40 arch/x86/entry/common.c:46 [<000000004abfdcf4>] entry_SYSCALL_64_after_hwframe+0x61/0xc6 To fix this the patch rearranges the goto labels to reflect the order of object allocations and adds appropriate goto statements on the error paths. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Mar 27, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 18th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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

If any of these changes, we'll tell you in the daily email digest.

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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 kernel4.9.337 and later · before 4.10
  • linux linux kernel4.14.303 and later · before 4.14.306
  • linux linux kernel4.19.270 and later · before 4.19.273
  • linux linux kernel5.4.229 and later · before 5.4.232
  • linux linux kernel5.10.163 and later · before 5.10.168
  • linux linux kernel5.15.86 and later · before 5.15.93
  • linux linux kernel6.0.16 and later · before 6.1
  • linux linux kernel6.1.2 and later · before 6.1.11

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

    • 4f592e712ea2132f511d545954867d7880df5be2, a991a411c3e21ef22507400dbb179ae02029d42caffected
    • 655e873bf528f0f46ce6b069f9a2daee9621197c and later · before 1ac653cf886cdfc082708c82dc6ac6115cebd2eeaffected · git
    • ee27d70556a47c3a07e65a60f47e3ea12a255af8 and later · before af4e720bc00a2653f7b9df21755b9978b3d7f386affected · git
    • 8b74211bf60b3e0c0ed4fe3d16c92ffdcaaf34eb and later · before ed6c5e8caf55778500202775167e8ccdb1a030cbaffected · git
    • 6736b61ecf230dd656464de0f514bdeadb384f20 and later · before 70154489f531587996f3e9d7cceeee65cff0001daffected · git
    • 0133615a06007684df648feb9d327714e399afd4 and later · before f423c2efd51d7eb1d143c2be7eea233241d9bbbfaffected · git
    • 32d5fa5bdccec2361fc6c4ed05a7367155b3a1e9 and later · before 70d40674a549d498bd63d5432acf46205da1534baffected · git
    • 68bb10101e6b0a6bb44e9c908ef795fc4af99eae and later · before 0c598aed445eb45b0ee7ba405f7ece99ee349c30affected · git
    • 4.9.337 and later · before 4.10affected · semver
    • 6.0.16 and later · before 6.1affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.11-16.1.11-1

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-2023-52975Mar 27, 2025 · scsi: iscsi_tcp: Fix UAF during logout when accessing the shost ipaddress
    31Monitor
  • ← EarlierCVE-2023-52976Mar 27, 2025 · efi: fix potential NULL deref in efi_mem_reserve_persistent
    22Monitor
  • Later →CVE-2023-52978Mar 27, 2025 · riscv: kprobe: Fixup kernel panic when probing an illegal position
    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 Linux0c598aed445eb45b0ee7ba405f7ece99ee349c30Vendor (CNA)
Linux Linux1ac653cf886cdfc082708c82dc6ac6115cebd2eeVendor (CNA)
Linux Linux4.10Vendor (CNA)
Linux Linux4.14.306Vendor (CNA)
Linux Linux4.19.273Vendor (CNA)
Linux Linux5.10.168Vendor (CNA)
Linux Linux5.15.93Vendor (CNA)
Linux Linux5.4.232Vendor (CNA)
Linux Linux6.1Vendor (CNA)
Linux Linux6.1.11Vendor (CNA)
Linux Linux70154489f531587996f3e9d7cceeee65cff0001dVendor (CNA)
Linux Linux70d40674a549d498bd63d5432acf46205da1534bVendor (CNA)
Linux Linuxaf4e720bc00a2653f7b9df21755b9978b3d7f386Vendor (CNA)
Linux Linuxed6c5e8caf55778500202775167e8ccdb1a030cbVendor (CNA)
Linux Linuxf423c2efd51d7eb1d143c2be7eea233241d9bbbfVendor (CNA)
debian:linux6.1.11-1 · 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

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
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 (6 more)

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

All records