CVE-2021-35039
published 2021-07-07CVE-2021-35039: kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a…
PriorityP338high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.25%
16.0th percentile
kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | linux | < linux 5.14.6-1 (bookworm) | linux 5.14.6-1 (bookworm) |
| linux | linux_kernel | >= 0 < 5.10.70-1 | 5.10.70-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 0 < 5.14.6-1 | 5.14.6-1 |
| linux | linux_kernel | >= 4.15 < 4.19.196 | 4.19.196 |
| linux | linux_kernel | >= 4.20 < 5.4.129 | 5.4.129 |
| linux | linux_kernel | >= 5.11 < 5.12.14 | 5.12.14 |
| linux | linux_kernel | >= 5.5 < 5.10.47 | 5.10.47 |
| msrc | cbl2_kernel_5.10.78.1-1_on_cbl_mariner_2.0 | — | — |
| msrc | cm1_kernel_5.10.60.1-1_on_cbl_mariner_1.0 | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvdv2.06.9MEDIUMAV:L/AC:M/Au:N/C:C/I:C/A:C
osv7.8HIGH
vendor_debian7.8HIGH
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
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Microsoft
kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG verification that a kernel module is signed for loading via init_mo
vendor_msrc·2021-07-13·CVSS 7.8
CVE-2021-35039 [HIGH] CWE-347 kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG verification that a kernel module is signed for loading via init_mo
kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG verification that a kernel module is signed for loading via init_module does not occur for a module.sig_enforce=1 command-line argument.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more informatio
Red Hat
kernel: allows loading unsigned kernel modules via init_module syscall
vendor_redhat·2021-07-06·CVSS 7.8
CVE-2021-35039 [HIGH] CWE-347 kernel: allows loading unsigned kernel modules via init_module syscall
kernel: allows loading unsigned kernel modules via init_module syscall
kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.
A flaw incorrect handle of boot param module.sig_enforce=1 in the Linux kernel modules sign verification functionality was found in the way user boot with this param enabled and both if kernel compiled with param CONFIG_MODULE_SIG unset, then user still can load unsigned module even param module.sig_enforce pretending to be enabled. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
S
Debian
CVE-2021-35039: linux - kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verifica...
vendor_debian·2021·CVSS 7.8
CVE-2021-35039 [HIGH] CVE-2021-35039: linux - kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verifica...
kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.
Scope: local
bookworm: resolved (fixed in 5.14.6-1)
bullseye: resolved (fixed in 5.10.70-1)
forky: resolved (fixed in 5.14.6-1)
sid: resolved (fixed in 5.14.6-1)
trixie: resolved (fixed in 5.14.6-1)
GHSA
GHSA-jf73-g393-6jw9: kernel/module
ghsa_unreviewed·2022-05-24
CVE-2021-35039 [HIGH] CWE-347 GHSA-jf73-g393-6jw9: kernel/module
kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.
OSV
CVE-2021-35039: kernel/module
osv·2021-07-07·CVSS 7.8
CVE-2021-35039 [HIGH] CVE-2021-35039: kernel/module
kernel/module.c in the Linux kernel before 5.12.14 mishandles Signature Verification, aka CID-0c18f29aae7c. Without CONFIG_MODULE_SIG, verification that a kernel module is signed, for loading via init_module, does not occur for a module.sig_enforce=1 command-line argument.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
http://www.openwall.com/lists/oss-security/2021/07/06/3https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.14https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c18f29aae7ce3dadd26d8ee3505d07cc982df75https://github.com/torvalds/linux/commit/0c18f29aae7ce3dadd26d8ee3505d07cc982df75https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlhttps://security.netapp.com/advisory/ntap-20210813-0004/https://www.openwall.com/lists/oss-security/2021/07/06/3http://www.openwall.com/lists/oss-security/2021/07/06/3https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.14https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c18f29aae7ce3dadd26d8ee3505d07cc982df75https://github.com/torvalds/linux/commit/0c18f29aae7ce3dadd26d8ee3505d07cc982df75https://lists.debian.org/debian-lts-announce/2021/10/msg00010.htmlhttps://security.netapp.com/advisory/ntap-20210813-0004/https://www.openwall.com/lists/oss-security/2021/07/06/3
2021-07-07
Published