NVD / CVE Program· CNA Linux

CVE-2024-53174: SUNRPC: make sure cache entry active before cache_show

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: 0.25% (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 02999e135b013d85c6df738746e8e24699befee4, 068c0b50f3f700b94f78850834cd91ae3b34c2c1, 2862eee078a4d2d1f584e7f24fa50dddfa5f3471.

Low priority for now. Upgrade to Linux Linux 02999e135b013d85c6df738746e8e24699befee4, 068c0b50f3f700b94f78850834cd91ae3b34c2c1, 2862eee078a4d2d1f584e7f24fa50dddfa5f3471 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: make sure cache entry active before cache_show The function `c_show` was called with protection from RCU. This only ensures that `cp` will not be freed. Therefore, the reference count for `cp` can drop to zero, which will trigger a refcount use-after-free warning when `cache_get` is called. To resolve this issue, use `cache_get_rcu` to ensure that `cp` remains active. ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 7 PID: 822 at lib/refcount.c:25 refcount_warn_saturate+0xb1/0x120 CPU: 7 UID: 0 PID: 822 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 RIP: 0010:refcount_warn_saturate+0xb1/0x120 Call Trace: <TASK> c_show+0x2fc/0x380 [sunrpc] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 proc_reg_read+0xe1/0x140 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

BDU:2025-04556

Published: Dec 27, 2024
Updated: Aug 5, 2026
EPSS: 0.2% · 17th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

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 kernelbefore 5.4.287
linux linux kernel5.5 and later · before 5.10.231
linux linux kernel5.11 and later · before 5.15.174
linux linux kernel5.16 and later · before 6.1.120
linux linux kernel6.2 and later · before 6.6.64
linux linux kernel6.7 and later · before 6.11.11
linux linux kernel6.12 and later · before 6.12.2

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
- 4.20affected
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before e9be26735d055c42543a4d047a769cc6d0fb1504affected · git
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before 02999e135b013d85c6df738746e8e24699befee4affected · git
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before c7dac3af57e38b2054f990e573256d90bf887958affected · git
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before 068c0b50f3f700b94f78850834cd91ae3b34c2c1affected · git
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before acfaf37888e0f0732fb6a50ff093dce6d99994d0affected · git
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before ec305f303bf070b4f6896b7a76009f702956d402affected · git
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before d882e2b7fad3f5e5fac66184a347f408813f654aaffected · git
- d48cf356a13073853f19be6ca5ebbecfc2762ebe and later · before 2862eee078a4d2d1f584e7f24fa50dddfa5f3471affected · git
- before 4.20not 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	before 6.1.123-1	6.1.123-1
Debian:13	linux	before 6.12.3-1	6.12.3-1

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-2024-53172Dec 27, 2024 · ubi: fastmap: Fix duplicate slab cache names while attaching
22Monitor
← EarlierCVE-2024-53173Dec 27, 2024 · NFSv4.0: Fix a use-after-free problem in the asynchronous open()
31Monitor
Later →CVE-2024-53175Dec 27, 2024 · ipc: fix memleak if msg_init_ns failed in create_ipc_ns
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	02999e135b013d85c6df738746e8e24699befee4	Vendor (CNA)
Linux Linux	068c0b50f3f700b94f78850834cd91ae3b34c2c1	Vendor (CNA)
Linux Linux	2862eee078a4d2d1f584e7f24fa50dddfa5f3471	Vendor (CNA)
Linux Linux	acfaf37888e0f0732fb6a50ff093dce6d99994d0	Vendor (CNA)
Linux Linux	c7dac3af57e38b2054f990e573256d90bf887958	Vendor (CNA)
Linux Linux	d882e2b7fad3f5e5fac66184a347f408813f654a	Vendor (CNA)
Linux Linux	e9be26735d055c42543a4d047a769cc6d0fb1504	Vendor (CNA)
Linux Linux	ec305f303bf070b4f6896b7a76009f702956d402	Vendor (CNA)
debian:linux	6.1.123-1 · Debian:12	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).

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

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/02999e135b013d85c6df738746e8e24699befee4

Show all references (9 more)

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

All records