CVE-2021-46956
Linux VirtioFS Memory Leak
Description
In the Linux kernel, the following vulnerability has been resolved: virtiofs: fix memory leak in virtio_fs_probe() When accidentally passing twice the same tag to qemu, kmemleak ended up reporting a memory leak in virtiofs. Also, looking at the log I saw the following error (that's when I realised the duplicated tag): virtiofs: probe of virtio5 failed with error -17 Here's the kmemleak log for reference: unreferenced object 0xffff888103d47800 (size 1024): comm "systemd-udevd", pid 118, jiffies 4294893780 (age 18.340s) hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff ................ backtrace: [<000000000ebb87c1>] virtio_fs_probe+0x171/0x7ae [virtiofs] [<00000000f8aca419>] virtio_dev_probe+0x15f/0x210 [<000000004d6baf3c>] really_probe+0xea/0x430 [<00000000a6ceeac8>] device_driver_attach+0xa8/0xb0 [<00000000196f47a7>] __driver_attach+0x98/0x140 [<000000000b20601d>] bus_for_each_dev+0x7b/0xc0 [<00000000399c7b7f>] bus_add_driver+0x11b/0x1f0 [<0000000032b09ba7>] driver_register+0x8f/0xe0 [<00000000cdd55998>] 0xffffffffa002c013 [<000000000ea196a2>] do_one_initcall+0x64/0x2e0 [<0000000008f727ce>] do_init_module+0x5c/0x260 [<000000003cdedab6>] __do_sys_finit_module+0xb5/0x120 [<00000000ad2f48c6>] do_syscall_64+0x33/0x40 [<00000000809526b5>] entry_SYSCALL_64_after_hwframe+0x44/0xae
INFO
Published Date :
Feb. 27, 2024, 7:04 p.m.
Last Modified :
Dec. 6, 2024, 5:54 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update the Linux kernel to the latest available version.
- Reboot the system to apply the kernel update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-46956.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-46956 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-46956
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-46956 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-46956 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Dec. 06, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE NIST CWE-401 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4 up to (excluding) 5.4.118 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.5 up to (excluding) 5.10.36 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.20 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.3 Changed Reference Type https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8 No Types Assigned https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8 Patch Changed Reference Type https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8 No Types Assigned https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8 Patch Changed Reference Type https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6 No Types Assigned https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6 Patch Changed Reference Type https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6 No Types Assigned https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6 Patch Changed Reference Type https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae No Types Assigned https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae Patch Changed Reference Type https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae No Types Assigned https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae Patch Changed Reference Type https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4 No Types Assigned https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4 Patch Changed Reference Type https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4 No Types Assigned https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4 Patch Changed Reference Type https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15 No Types Assigned https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15 Patch Changed Reference Type https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15 No Types Assigned https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15 Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8 Added Reference https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6 Added Reference https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae Added Reference https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4 Added Reference https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 27, 2024
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: virtiofs: fix memory leak in virtio_fs_probe() When accidentally passing twice the same tag to qemu, kmemleak ended up reporting a memory leak in virtiofs. Also, looking at the log I saw the following error (that's when I realised the duplicated tag): virtiofs: probe of virtio5 failed with error -17 Here's the kmemleak log for reference: unreferenced object 0xffff888103d47800 (size 1024): comm "systemd-udevd", pid 118, jiffies 4294893780 (age 18.340s) hex dump (first 32 bytes): 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... ff ff ff ff ff ff ff ff 80 90 02 a0 ff ff ff ff ................ backtrace: [<000000000ebb87c1>] virtio_fs_probe+0x171/0x7ae [virtiofs] [<00000000f8aca419>] virtio_dev_probe+0x15f/0x210 [<000000004d6baf3c>] really_probe+0xea/0x430 [<00000000a6ceeac8>] device_driver_attach+0xa8/0xb0 [<00000000196f47a7>] __driver_attach+0x98/0x140 [<000000000b20601d>] bus_for_each_dev+0x7b/0xc0 [<00000000399c7b7f>] bus_add_driver+0x11b/0x1f0 [<0000000032b09ba7>] driver_register+0x8f/0xe0 [<00000000cdd55998>] 0xffffffffa002c013 [<000000000ea196a2>] do_one_initcall+0x64/0x2e0 [<0000000008f727ce>] do_init_module+0x5c/0x260 [<000000003cdedab6>] __do_sys_finit_module+0xb5/0x120 [<00000000ad2f48c6>] do_syscall_64+0x33/0x40 [<00000000809526b5>] entry_SYSCALL_64_after_hwframe+0x44/0xae Added Reference Linux https://git.kernel.org/stable/c/310efc95c72c13faf855c692d19cd4d054d827c8 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/d19555ff225d0896a33246a49279e6d578095f15 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/9b9d60c0eb8ada99cce2a9ab5c15dffc523b01ae [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/5116e79fc6e6725b8acdad8b7e928a83ab7b47e6 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/c79c5e0178922a9e092ec8fed026750f39dcaef4 [No types assigned]