CVE-2022-49675

published 2025-02-26

CVE-2022-49675: In the Linux kernel, the following vulnerability has been resolved: tick/nohz: unexport __init-annotated tick_nohz_full_setup() EXPORT_SYMBOL and __init is a…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

tick/nohz: unexport __init-annotated tick_nohz_full_setup()

EXPORT_SYMBOL and __init is a bad combination because the .init.text
section is freed up after the initialization. Hence, modules cannot
use symbols annotated __init. The access to a freed symbol may end up
with kernel panic.

modpost used to detect it, but it had been broken for a decade.

Commit 28438794aba4 ("modpost: fix section mismatch check for exported
init/exit sections") fixed it so modpost started to warn it again, then
this showed up:

MODPOST vmlinux.symvers
WARNING: modpost: vmlinux.o(___ksymtab_gpl+tick_nohz_full_setup+0x0): Section mismatch in reference from the variable __ksymtab_tick_nohz_full_setup to the function .init.text:tick_nohz_full_setup()
The symbol tick_nohz_full_setup is exported and annotated __init
Fix this by removing the __init annotation of tick_nohz_full_setup or drop the export.

Drop the export because tick_nohz_full_setup() is only called from the
built-in code in kernel/sched/isolation.c.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.18.14-1 (bookworm)	linux 5.18.14-1 (bookworm)
linux	linux	—	—
linux	linux	>= ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 < c4ff3ffe0138234774602152fe67e3a898c615c6	c4ff3ffe0138234774602152fe67e3a898c615c6
linux	linux	>= ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 < f4a80ec8c51d68be4b7a7830c510f75080c5e417	f4a80ec8c51d68be4b7a7830c510f75080c5e417
linux	linux	>= ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 < ea32b27e2f8c58c92bff5ecba7fcf64b97707089	ea32b27e2f8c58c92bff5ecba7fcf64b97707089
linux	linux	>= ae9e557b5be2e285f48ee945d9c8faf75d4f6a66 < 2390095113e98fc52fffe35c5206d30d9efe3f78	2390095113e98fc52fffe35c5206d30d9efe3f78
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.136-1	5.10.136-1
linux	linux_kernel	>= 0 < 5.18.14-1	5.18.14-1
linux	linux_kernel	>= 0 < 5.18.14-1	5.18.14-1
linux	linux_kernel	>= 0 < 5.18.14-1	5.18.14-1
linux	linux_kernel	>= 5.11 < 5.15.52	5.15.52
linux	linux_kernel	>= 5.16 < 5.18.9	5.18.9
linux	linux_kernel	>= 5.5 < 5.10.128	5.10.128

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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