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NVD / CVE Program· CNA Linux

CVE-2023-52885: SUNRPC: Fix UAF in svc_tcp_listen_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: 0.55% (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 42725e5c1b181b757ba11d804443922982334d9b, 7e1f989055622fd086c5dfb291fc72adf5660b6f, c7b8c2d06e437639694abe76978e915cfb73f428.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 42725e5c1b181b757ba11d804443922982334d9b, 7e1f989055622fd086c5dfb291fc72adf5660b6f, c7b8c2d06e437639694abe76978e915cfb73f428 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: SUNRPC: Fix UAF in svc_tcp_listen_data_ready() After the listener svc_sock is freed, and before invoking svc_tcp_accept() for the established child sock, there is a window that the newsock retaining a freed listener svc_sock in sk_user_data which cloning from parent. In the race window, if data is received on the newsock, we will observe use-after-free report in svc_tcp_listen_data_ready(). Reproduce by two tasks: 1. while :; do rpc.nfsd 0 ; rpc.nfsd; done 2. while :; do echo "" | ncat -4 127.0.0.1 2049 ; done KASAN report: ================================================================== BUG: KASAN: slab-use-after-free in svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] Read of size 8 at addr ffff888139d96228 by task nc/102553 CPU: 7 PID: 102553 Comm: nc Not tainted 6.3.0+ #18 Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 Call Trace: <IRQ> dump_stack_lvl+0x33/0x50 print_address_description.constprop.0+0x27/0x310 print_report+0x3e/0x70 kasan_report+0xae/0xe0 svc_tcp_listen_data_ready+0x1cf/0x1f0 [sunrpc] tcp_data_queue+0x9f4/0x20e0 tcp_rcv_established+0x666/0x1f60 tcp_v4_do_rcv+0x51c/0x850 tcp_v4_rcv+0x23fc/0x2e80 ip_protocol_deliver_rcu+0x62/0x300 ip_local_deliver_finish+0x267/0x350 ip_local_deliver+0x18b/0x2d0 ip_rcv+0x2fb/0x370 __netif_receive_skb_one_core+0x166/0x1b0 process_backlog+0x24c/0x5e0 __napi_poll+0xa2/0x500 net_rx_action+0x854/0xc90 __do_softirq+0x1bb/0x5de do_softirq+0xcb/0x100 </IRQ> <TASK> ... </TASK> Allocated by task 102371: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0x7b/0x90 svc_setup_socket+0x52/0x4f0 [sunrpc] svc_addsock+0x20d/0x400 [sunrpc] __write_ports_addfd+0x209/0x390 [nfsd] write_ports+0x239/0x2c0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Freed by task 102551: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x50 __kasan_slab_free+0x106/0x190 __kmem_cache_free+0x133/0x270 svc_xprt_free+0x1e2/0x350 [sunrpc] svc_xprt_destroy_all+0x25a/0x440 [sunrpc] nfsd_put+0x125/0x240 [nfsd] nfsd_svc+0x2cb/0x3c0 [nfsd] write_threads+0x1ac/0x2a0 [nfsd] nfsctl_transaction_write+0xac/0x110 [nfsd] vfs_write+0x1c3/0xae0 ksys_write+0xed/0x1c0 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Fix the UAF by simply doing nothing in svc_tcp_listen_data_ready() if state != TCP_LISTEN, that will avoid dereferencing svsk for all child socket.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jul 14, 2024
Updated
Aug 5, 2026
EPSS
0.5% · 46th 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 · 0.5%

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
8.1
0.3 point gap

CVSS:3.1/AV:N/AC:H/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.

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 kernel4.8 and later · before 4.14.322
  • linux linux kernel4.15 and later · before 4.19.291
  • linux linux kernel4.20 and later · before 5.4.251
  • linux linux kernel5.5 and later · before 5.10.188
  • linux linux kernel5.11 and later · before 5.15.121
  • linux linux kernel5.16 and later · before 6.1.39
  • linux linux kernel6.2 and later · before 6.4.4

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

    • 4.8affected
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before c7b8c2d06e437639694abe76978e915cfb73f428affected · git
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before dfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254affected · git
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before 42725e5c1b181b757ba11d804443922982334d9baffected · git
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before cd5ec3ee52ce4b7e283cc11facfa420c297c8065affected · git
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before fbf4ace39b2e4f3833236afbb2336edbafd75eeeaffected · git
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before ef047411887ff0845afd642d6a687819308e1a4eaffected · git
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before 7e1f989055622fd086c5dfb291fc72adf5660b6faffected · git
    • fa9251afc33c81606d70cfe91800a779096442ec and later · before fc80fc2d4e39137869da3150ee169b40bf879287affected · git
    • before 4.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.52-16.1.52-1
Debian:13linuxbefore 6.4.4-16.4.4-1
openSUSE:Leap 15.6dtb-aarch64before 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-64kbbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-azurebefore 6.4.0-150600.8.11.16.4.0-150600.8.11.1
openSUSE:Leap 15.6kernel-debugbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-defaultbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-default-basebefore 6.4.0-150600.23.22.1.150600.12.8.36.4.0-150600.23.22.1.150600.12.8.3
openSUSE:Leap 15.6kernel-docsbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-kvmsmallbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-obs-buildbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-obs-qabefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-rtbefore 6.4.0-150600.10.8.36.4.0-150600.10.8.3
openSUSE:Leap 15.6kernel-rt_debugbefore 6.4.0-150600.10.8.36.4.0-150600.10.8.3
openSUSE:Leap 15.6kernel-sourcebefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-source-azurebefore 6.4.0-150600.8.11.16.4.0-150600.8.11.1
openSUSE:Leap 15.6kernel-source-rtbefore 6.4.0-150600.10.8.36.4.0-150600.10.8.3
openSUSE:Leap 15.6kernel-symsbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
openSUSE:Leap 15.6kernel-syms-azurebefore 6.4.0-150600.8.11.16.4.0-150600.8.11.1
openSUSE:Leap 15.6kernel-syms-rtbefore 6.4.0-150600.10.8.16.4.0-150600.10.8.1
openSUSE:Leap 15.6kernel-zfcpdumpbefore 6.4.0-150600.23.22.16.4.0-150600.23.22.1
Red Hat:rhel_aus:8.6::baseosbpftoolbefore 0:4.18.0-372.118.1.el8_60:4.18.0-372.118.1.el8_6
Red Hat:rhel_aus:8.6::baseosbpftool-debuginfobefore 0:4.18.0-372.118.1.el8_60:4.18.0-372.118.1.el8_6
Red Hat:rhel_aus:8.6::baseoskernelbefore 0:4.18.0-372.118.1.el8_60:4.18.0-372.118.1.el8_6

+96

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-2024-41005Jul 12, 2024 · netpoll: Fix race condition in netpoll_owner_active
    18Monitor
  • ← EarlierCVE-2024-41006Jul 12, 2024 · netrom: Fix a memory leak in nr_heartbeat_expiry()
    22Monitor
  • Later →CVE-2024-41007Jul 15, 2024 · tcp: avoid too many retransmit packets
    13Monitor

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 Linux42725e5c1b181b757ba11d804443922982334d9bVendor (CNA)
Linux Linux7e1f989055622fd086c5dfb291fc72adf5660b6fVendor (CNA)
Linux Linuxc7b8c2d06e437639694abe76978e915cfb73f428Vendor (CNA)
Linux Linuxcd5ec3ee52ce4b7e283cc11facfa420c297c8065Vendor (CNA)
Linux Linuxdfc896c4a75cb8cd7cb2dfd9b469cf1e3f004254Vendor (CNA)
Linux Linuxef047411887ff0845afd642d6a687819308e1a4eVendor (CNA)
Linux Linuxfbf4ace39b2e4f3833236afbb2336edbafd75eeeVendor (CNA)
Linux Linuxfc80fc2d4e39137869da3150ee169b40bf879287Vendor (CNA)
debian:linux6.1.52-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.4.0-150600.23.22.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-64kb6.4.0-150600.23.22.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-azure6.4.0-150600.8.11.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-debug6.4.0-150600.23.22.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default6.4.0-150600.23.22.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-default-base6.4.0-150600.23.22.1.150600.12.8.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-rt6.4.0-150600.10.8.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-rt_debug6.4.0-150600.10.8.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-azure6.4.0-150600.8.11.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-source-rt6.4.0-150600.10.8.3 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-azure6.4.0-150600.8.11.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:kernel-syms-rt6.4.0-150600.10.8.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:bpftool-debuginfo0:7.0.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-284.77.1.el9_2 · Red Hat:rhel_eus:9.2::appstreamPackage registry (OSV)

+23

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.

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-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

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

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&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

  1. Fix✗ → ✓

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

References

Show all references (7 more)

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

All records