NVD / CVE Program· CNA Linux

CVE-2024-26800: tls: fix use-after-free on failed backlog decryption

HighCVSS 7.8 · v3.1—No exploit Fix available

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: 0.74% (FIRST EPSS); higher than 55.2% of all records.
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 13114dc5543069f7b97991e3b79937b6da05f5b0, 1ac9fb84bc7ecd4bc6428118301d9d864d2a58d1, 5.16; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.
Severity is disputed: the assigning authority (CNA) scores it 9.8, NVD 7.8.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 13114dc5543069f7b97991e3b79937b6da05f5b0, 1ac9fb84bc7ecd4bc6428118301d9d864d2a58d1, 5.16; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes 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: tls: fix use-after-free on failed backlog decryption When the decrypt request goes to the backlog and crypto_aead_decrypt returns -EBUSY, tls_do_decryption will wait until all async decryptions have completed. If one of them fails, tls_do_decryption will return -EBADMSG and tls_decrypt_sg jumps to the error path, releasing all the pages. But the pages have been passed to the async callback, and have already been released by tls_decrypt_done. The only true async case is when crypto_aead_decrypt returns -EINPROGRESS. With -EBUSY, we already waited so we can tell tls_sw_recvmsg that the data is available for immediate copy, but we need to notify tls_decrypt_sg (via the new ->async_done flag) that the memory has already been released.

Memory safety

Published: Apr 4, 2024
Updated: Aug 5, 2026
EPSS: 0.7% · 55th percentile
CWE: CWE-416

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.7%

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: 9.8; 2.0 point gap

CVSS:3.1/AV:N/AC:L/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

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

Is your version affected? Check it

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 kernel5.15.160 and later · before 5.16
linux linux kernel6.6.18 and later · before 6.6.21
linux linux kernel6.7.6 and later · before 6.7.9
linux linux kernel6.8

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
- 3ade391adc584f17b5570fd205de3ad029090368affected
- cd1bbca03f3c1d845ce274c0d0a66de8e5929f72 and later · before f2b85a4cc763841843de693bbd7308fe9a2c4c89affected · git
- 13eca403876bbea3716e82cdfe6f1e6febb38754 and later · before 81be85353b0f5a7b660635634b655329b429eefeaffected · git
- ab6397f072e5097f267abf5cb08a8004e6b17694 and later · before 1ac9fb84bc7ecd4bc6428118301d9d864d2a58d1affected · git
- 8590541473188741055d27b955db0777569438e3 and later · before 13114dc5543069f7b97991e3b79937b6da05f5b0affected · git
- 5.15.160 and later · before 5.16affected · semver
- 6.6.18 and later · before 6.6.21affected · semver
- 6.7.6 and later · before 6.7.9affected · 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 6.1.85-1	6.1.85-1
Debian:13	linux	before 6.7.9-1	6.7.9-1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-64kb	before 5.3.18-150300.59.170.1	5.3.18-150300.59.170.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-default-base	before 5.3.18-150300.59.170.1.150300.18.100.1	5.3.18-150300.59.170.1.150300.18.100.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-docs	before 5.3.18-150300.59.170.2	5.3.18-150300.59.170.2
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-obs-build	before 5.3.18-150300.59.170.1	5.3.18-150300.59.170.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-preempt	before 5.3.18-150300.59.170.1	5.3.18-150300.59.170.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-source	before 5.3.18-150300.59.170.1	5.3.18-150300.59.170.1
SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	kernel-syms	before 5.3.18-150300.59.170.1	5.3.18-150300.59.170.1
SUSE:Linux Enterprise Live Patching 15 SP3	kernel-default	before 5.3.18-150300.59.170.1	5.3.18-150300.59.170.1
SUSE:Linux Enterprise Live Patching 15 SP3	kernel-livepatch-SLE15-SP3_Update_47	before 1-150300.7.3.1	1-150300.7.3.1
SUSE:Linux Enterprise Micro 5.1	kernel-rt	before 5.3.18-150300.178.1	5.3.18-150300.178.1
SUSE:Linux Enterprise Micro 5.1	kernel-source-rt	before 5.3.18-150300.178.1	5.3.18-150300.178.1
SUSE:Linux Enterprise Server 15 SP3-LTSS	kernel-zfcpdump	before 5.3.18-150300.59.170.1	5.3.18-150300.59.170.1

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-2024-26797Apr 4, 2024 · drm/amd/display: Prevent potential buffer overflow in map_hw_resources
31Monitor
← EarlierCVE-2024-26798Apr 4, 2024 · fbcon: always restore the old font data in fbcon_do_set_font()
22Monitor
Later →CVE-2024-26801Apr 4, 2024 · Bluetooth: Avoid potential use-after-free in hci_error_reset
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	13114dc5543069f7b97991e3b79937b6da05f5b0	Vendor (CNA)
Linux Linux	1ac9fb84bc7ecd4bc6428118301d9d864d2a58d1	Vendor (CNA)
Linux Linux	5.16	Vendor (CNA)
Linux Linux	6.6.21	Vendor (CNA)
Linux Linux	6.7.9	Vendor (CNA)
Linux Linux	81be85353b0f5a7b660635634b655329b429eefe	Vendor (CNA)
Linux Linux	f2b85a4cc763841843de693bbd7308fe9a2c4c89	Vendor (CNA)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0	Release Notes	Microsoft (MSRC)
debian:linux	6.1.85-1 · Debian:12	Package registry (OSV)
suse:kernel-64kb	5.3.18-150300.59.170.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	Package registry (OSV)
suse:kernel-default	5.3.18-150300.59.170.1 · SUSE:Linux Enterprise Live Patching 15 SP3	Package registry (OSV)
suse:kernel-default-base	5.3.18-150300.59.170.1.150300.18.100.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	Package registry (OSV)
suse:kernel-docs	5.3.18-150300.59.170.2 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	Package registry (OSV)
suse:kernel-livepatch-SLE15-SP3_Update_47	1-150300.7.3.1 · SUSE:Linux Enterprise Live Patching 15 SP3	Package registry (OSV)
suse:kernel-obs-build	5.3.18-150300.59.170.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	Package registry (OSV)
suse:kernel-preempt	5.3.18-150300.59.170.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	Package registry (OSV)
suse:kernel-rt	5.3.18-150300.178.1 · SUSE:Linux Enterprise Micro 5.1	Package registry (OSV)
suse:kernel-source	5.3.18-150300.59.170.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	Package registry (OSV)
suse:kernel-source-rt	5.3.18-150300.178.1 · SUSE:Linux Enterprise Micro 5.1	Package registry (OSV)
suse:kernel-syms	5.3.18-150300.59.170.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSS	Package registry (OSV)
suse:kernel-zfcpdump	5.3.18-150300.59.170.1 · SUSE:Linux Enterprise Server 15 SP3-LTSS	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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-0273 · Apr 5, 2024(Linux Kernel Güncellemesi)

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

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, 10:08 PM UTC

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

References

git.kernel.org/stable/c/13114dc5543069f7b97991e3b79937b6da05f5b0

Show all references (3 more)

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

All records