What is CVE-2026-98049?

CVE-2026-98049 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Incorrect Conversion Between Numeric Types flaw (CWE-681), affecting Linux kernel versions from 6.10 onward and patched in 7.2.7 and 7.3-rc2. CVE-2026-98049 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-98049?

CVE-2026-98049 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-98049?

Yes, CVE-2026-98049 has been patched. Fixed versions include 7.2.7 and 7.3-rc2. If you are running Linux kernel 6.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-98049 actively exploited?

CVE-2026-98049 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Incorrect Conversion Between Numeric Types (CWE-681)?

The product converts from one data type to another but uses a function that can produce incorrect results. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/681.html

CVE-2026-98049

Medium

In the Linux kernel, the following vulnerability has been resolved: bpf: zero extend the result of an arena 32-bit cmpxchg bpf_convert_ctx_accesses() rewrites an atomic on an arena pointer from BPF_STX | BPF_ATOMIC to BPF_STX | BPF_PROBE_ATOMIC, and it runs before bpf_opt_subreg_zext_lo32_rnd_hi32(). That pass emits an explicit zero extension for a 32-bit cmpxchg even when bpf_jit_needs_zext() is false. This is done because on some architectures 32-bit cmpxchg requires explicit zero extension for the dst register. E.g. on x86-64 'lock cmpxchg' does not change the %eax if comparison is successful, while BPF semantics declare that each operation on a 32-bit register zero extends it's upper half. is_cmpxchg_insn() matches BPF_MODE == BPF_ATOMIC only, so an arena cmpxchg misses said zero extension adjustment. This patch adjusts is_cmpxchg_insn() to match BPF_PROBE_ATOMIC alongside BPF_ATOMIC.

Package Linux Kernel

Published 2026-09-25

Last modified 2026-10-06

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-681

CVE-2026-98049 is a Incorrect Conversion Between Numeric Types vulnerability

What is Incorrect Conversion Between Numeric Types?

The product converts from one data type to another but uses a function that can produce incorrect results. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.10 and later are affected. Fixed in 7.2.7, 7.3-rc2 and their respective stable series.

Affected from

≥ 6.10

Fixed in

✓ 7.2.7 7.2.x ✓ 7.3-rc2

References

2 total

Kernel Git
https://git.kernel.org/stable/c/1c1b476d43a8b6c9bc04600369dd8cc39950d98e

Patch
Kernel Git
https://git.kernel.org/stable/c/4814ed6406f3493bd554ad046da5f7fc04833571

Patch

Details

CVE ID CVE-2026-98049

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-09-25

Modified 2026-10-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-98049?

CVE-2026-98049 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Incorrect Conversion Between Numeric Types flaw (CWE-681) . It affects Linux kernel versions from 6.10 onward and has been patched in 7.2.7 and 7.3-rc2. CVE-2026-98049 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-98049?

CVE-2026-98049 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-98049?

Yes. CVE-2026-98049 has been patched. Fixed versions include 7.2.7 and 7.3-rc2. If you are running Linux kernel 6.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-98049 actively exploited?

No. CVE-2026-98049 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.