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CVE-2025-38112· NVD / CVE Program· CNA Linux

net: Fix TOCTOU issue in sk_is_readable()

In the Linux kernel, the following vulnerability has been resolved: net: Fix TOCTOU issue in sk_is_readable() sk->sk_prot->sock_is_readable is a valid function pointer when sk resides in a sockmap. After the last sk_psock_put() (which usually happens when socket is removed from sockmap), sk->sk_prot gets restored and sk->sk_prot->sock_is_readable becomes NULL. This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded after the initial check. Which in turn may lead to a null pointer dereference. Ensure the function pointer does not turn NULL after the check.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Jul 3, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile
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Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Noroxi analysis

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Affected systems

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.11 and later · before 5.15.186
  • linux linux kernel5.16 and later · before 6.1.142
  • linux linux kernel6.2 and later · before 6.6.94
  • linux linux kernel4.17 and later · before 5.10.239
  • linux linux kernel6.13 and later · before 6.15.3
  • linux linux kernel6.7 and later · before 6.12.34
  • linux linux kernel6.16

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

    • 4.17affected
    • 8934ce2fd08171e8605f7fada91ee7619fe17ab8 and later · before c2b26638476baee154920bb587fc94ff1bf04336affected · git
    • 8934ce2fd08171e8605f7fada91ee7619fe17ab8 and later · before 6fa68d7eab34d448a61aa24ea31e68b3231ed20daffected · git
    • 8934ce2fd08171e8605f7fada91ee7619fe17ab8 and later · before 8926a7ef1977a832dd6bf702f1a99303dbf15b15affected · git
    • 8934ce2fd08171e8605f7fada91ee7619fe17ab8 and later · before ff55c85a923e043d59d26b20a673a1b4a219c310affected · git
    • 8934ce2fd08171e8605f7fada91ee7619fe17ab8 and later · before 1e0de7582ceccbdbb227d4e0ddf65732f92526daaffected · git
    • 8934ce2fd08171e8605f7fada91ee7619fe17ab8 and later · before 1b367ba2f94251822577daed031d6b9a9e11ba91affected · git
    • 8934ce2fd08171e8605f7fada91ee7619fe17ab8 and later · before 2660a544fdc0940bba15f70508a46cf9a6491230affected · git
    • before 4.17not affected · semver
    • 5.10.239 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.147-16.1.147-1
Debian:13linuxbefore 6.12.35-16.12.35-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
    77This week
  • CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV
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  • CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV
    77This week

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 Linux1b367ba2f94251822577daed031d6b9a9e11ba91Vendor (CNA)
Linux Linux1e0de7582ceccbdbb227d4e0ddf65732f92526daVendor (CNA)
Linux Linux2660a544fdc0940bba15f70508a46cf9a6491230Vendor (CNA)
Linux Linux6fa68d7eab34d448a61aa24ea31e68b3231ed20dVendor (CNA)
Linux Linux8926a7ef1977a832dd6bf702f1a99303dbf15b15Vendor (CNA)
Linux Linuxc2b26638476baee154920bb587fc94ff1bf04336Vendor (CNA)
Linux Linuxff55c85a923e043d59d26b20a673a1b4a219c310Vendor (CNA)
azl3 kernel 6.6.92.2-2 on Azure Linux 3.06.6.96.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.96.1-1 on Azure Linux 3.06.6.96.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.147-1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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-2025-3835219 days apartposix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()KEV
    61This week
  • CVE-2026-64091381 days apartbatman-adv: tt: fix TOCTOU race for reported vlans
    39Monitor
  • CVE-2026-31678296 days apartopenvswitch: defer tunnel netdev_put to RCU release
    31Monitor
  • CVE-2026-43433309 days apartrust_binder: avoid reading the written value in offsets array
    31Monitor
  • CVE-2026-53145357 days apartdrm/gem: Try to fix change_handle ioctl, attempt 4
    31Monitor
  • CVE-2026-53250357 days apartxsk: cache csum_start/csum_offset to fix TOCTOU in xsk_skb_metadata()
    31Monitor

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.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

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

All records