How many CVEs have patched len?

9 published CVEs changed len in debian/glibc, in 3 distinct patches totalling 177 changed lines, between 2017 and 2026.

What is the latest CVE that changed len?

CVE-2025-15281 (wordexp with WRDE_REUSE and WRDE_APPEND may return uninitialized memory), published 2026-01-20, changed lines 169 to 174 of sysdeps/aarch64/multiarch/strlen_asimd.S.

How does len compare to the rest of debian/glibc?

debian/glibc has 23 CVEs with a located fix in total; 9 of them changed len.

What do the line numbers refer to?

Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

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debian/glibc

Function

3 files

len

Name: len in debian/glibc: CVE fixes
Creator: RadicalNotion.AI
License: https://creativecommons.org/licenses/by-nc/4.0/

Defined in 3 files

Last patched January 20, 2026

9

CVEs

That changed this function

3

Distinct patches

Backports counted once

177

Lines changed

Added plus removed

2017–2026

Years

By CVE publication date

Overview

len in debian/glibc was changed by 9 published CVE fixes between 2017 and 2026, in 3 distinct patches that added or removed 177 lines in total.

The name occurs in 3 files: sysdeps/aarch64/strnlen.S, sysdeps/aarch64/multiarch/strlen_asimd.S, sysdeps/aarch64/strcpy.S.

debian/glibc has 23 CVEs with a located fix in total, so 39% of them touched this function.

CVEs that patched it

Every published CVE whose fix changed len, newest first, with the lines each fix touched.

wordexp with WRDE_REUSE and WRDE_APPEND may return uninitialized memory
CVE-2025-15281 · sysdeps/aarch64/multiarch/strlen_asimd.S · lines 169–174 · +2 −8
High · CVSS 7.5
EPSS 0.5%2026-01-20
wordexp with WRDE_REUSE and WRDE_APPEND may return uninitialized memory
CVE-2025-15281 · sysdeps/aarch64/strcpy.S · lines 140–170 · +17 −11
High · CVSS 7.5
EPSS 0.5%2026-01-20

CVE-2025-0395

CVE-2025-0395 · sysdeps/aarch64/multiarch/strlen_asimd.S · lines 169–174 · +2 −8

Medium · CVSS 6.2

EPSS 0.4%2025-01-22

CVE-2025-0395

CVE-2025-0395 · sysdeps/aarch64/strcpy.S · lines 140–170 · +17 −11

Medium · CVSS 6.2

EPSS 0.4%2025-01-22

Glibc: potential use-after-free in getaddrinfo()

CVE-2023-4806 · sysdeps/aarch64/multiarch/strlen_asimd.S · lines 169–174 · +2 −8

Medium · CVSS 5.9

EPSS 1.6%2023-09-18

Glibc: potential use-after-free in getaddrinfo()

CVE-2023-4806 · sysdeps/aarch64/strcpy.S · lines 140–170 · +17 −11

Medium · CVSS 5.9

EPSS 1.6%2023-09-18

Glibc: stack read overflow in getaddrinfo in no-aaaa mode

CVE-2023-4527 · sysdeps/aarch64/multiarch/strlen_asimd.S · lines 169–174 · +2 −8

Medium · CVSS 6.5

EPSS 1.7%2023-09-18

Glibc: stack read overflow in getaddrinfo in no-aaaa mode

CVE-2023-4527 · sysdeps/aarch64/strcpy.S · lines 140–170 · +17 −11

Medium · CVSS 6.5

EPSS 1.7%2023-09-18

CVE-2020-27618

CVE-2020-27618 · sysdeps/aarch64/strnlen.S · lines 157–163 · +5 −0

Medium · CVSS 5.5

EPSS 0.9%2021-02-26

CVE-2019-25013

CVE-2019-25013 · sysdeps/aarch64/strnlen.S · lines 157–163 · +5 −0

Medium · CVSS 5.9

EPSS 3.6%2021-01-04

CVE-2020-29562

CVE-2020-29562 · sysdeps/aarch64/strnlen.S · lines 157–163 · +5 −0

Medium · CVSS 4.8

EPSS 1.7%2020-12-04

CVE-2020-6096

CVE-2020-6096 · sysdeps/aarch64/strnlen.S · lines 157–163 · +5 −0

High · CVSS 8.1

EPSS 5.5%2020-04-01

CVE-2016-10228

CVE-2016-10228 · sysdeps/aarch64/strnlen.S · lines 157–163 · +5 −0

Medium · CVSS 5.9

EPSS 4.1%2017-03-02

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Other functions in these files

Functions in the same files that CVE fixes also changed.

Other hotspots in the repository

Functions in debian/glibc changed by the most CVE fixes.

tmp19 CVEs · sysdeps/aarch64/memcpy.S __mips16_syscall15 CVEs · sysdeps/unix/sysv/linux/mips/mips32/mips16/mips16-syscall.h dstend5 CVEs · sysdeps/aarch64/memcpy.S __gconv_open5 CVEs · iconv/gconv_int.h __volatile__5 CVEs · sysdeps/unix/sysv/linux/microblaze/sysdep.h __mips_syscall55 CVEs · sysdeps/unix/sysv/linux/mips/mips32/sysdep.h

All patched functions in debian/glibc

Frequently asked questions

Common questions about CVE fixes to len.

How many CVEs have patched len?: 9 published CVEs changed len in debian/glibc, in 3 distinct patches totalling 177 changed lines, between 2017 and 2026.
What is the latest CVE that changed len?: CVE-2025-15281 (wordexp with WRDE_REUSE and WRDE_APPEND may return uninitialized memory), published 2026-01-20, changed lines 169 to 174 of sysdeps/aarch64/multiarch/strlen_asimd.S.
How does len compare to the rest of debian/glibc?: debian/glibc has 23 CVEs with a located fix in total; 9 of them changed len.
What do the line numbers refer to?: Line numbers are in the fixed version of the file, as the upstream patch left it. A CVE whose fix was backported to several branches is listed once, with the lines from the upstream commit.

References

Fix locations are computed by RadicalNotion.AI from the upstream patch diff of each CVE. CVE data is sourced from the CVE Program.

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