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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.23%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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..
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.23% probability · 14th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/03c649dee8b1eb5600212a249542a70f47a5ab40Patch
- https://git.kernel.org/stable/c/47a017f33943278570c072bc71681809b2567b3aPatch
- https://git.kernel.org/stable/c/48ec949ac979b4b42d740f67b6177797af834f80Patch
- https://git.kernel.org/stable/c/ea474054c2cc6e1284604b21361f475c7cc8c0a0Patch
- https://git.kernel.org/stable/c/03c649dee8b1eb5600212a249542a70f47a5ab40Patch
- https://git.kernel.org/stable/c/47a017f33943278570c072bc71681809b2567b3aPatch
- https://git.kernel.org/stable/c/48ec949ac979b4b42d740f67b6177797af834f80Patch
- https://git.kernel.org/stable/c/ea474054c2cc6e1284604b21361f475c7cc8c0a0Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.