Vulnerability Details : CVE-2021-46973
In the Linux kernel, the following vulnerability has been resolved:
net: qrtr: Avoid potential use after free in MHI send
It is possible that the MHI ul_callback will be invoked immediately
following the queueing of the skb for transmission, leading to the
callback decrementing the refcount of the associated sk and freeing the
skb.
As such the dereference of skb and the increment of the sk refcount must
happen before the skb is queued, to avoid the skb to be used after free
and potentially the sk to drop its last refcount..
Vulnerability category: Memory Corruption
Products affected by CVE-2021-46973
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Exploit prediction scoring system (EPSS) score for CVE-2021-46973
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 12 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-46973
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
8.4
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.5
|
5.9
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2024-08-01 |
CWE ids for CVE-2021-46973
-
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.Assigned by: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
References for CVE-2021-46973
-
https://git.kernel.org/stable/c/48ec949ac979b4b42d740f67b6177797af834f80
net: qrtr: Avoid potential use after free in MHI send - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/03c649dee8b1eb5600212a249542a70f47a5ab40
net: qrtr: Avoid potential use after free in MHI send - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/ea474054c2cc6e1284604b21361f475c7cc8c0a0
net: qrtr: Avoid potential use after free in MHI send - kernel/git/stable/linux.git - Linux kernel stable tree
-
https://git.kernel.org/stable/c/47a017f33943278570c072bc71681809b2567b3a
net: qrtr: Avoid potential use after free in MHI send - kernel/git/stable/linux.git - Linux kernel stable tree
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