CVE-2021-47301
igb: Fix use-after-free error during reset
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Description
In the Linux kernel, the following vulnerability has been resolved: igb: Fix use-after-free error during reset Cleans the next descriptor to watch (next_to_watch) when cleaning the TX ring. Failure to do so can cause invalid memory accesses. If igb_poll() runs while the controller is reset this can lead to the driver try to free a skb that was already freed. (The crash is harder to reproduce with the igb driver, but the same potential problem exists as the code is identical to igc)
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/7b292608db23ccbbfbfa50cdb155d01725d7a52e
- https://git.kernel.org/stable/c/88e0720133d42d34851c8721cf5f289a50a8710f
- https://git.kernel.org/stable/c/8e24c12f2ff6d32fd9f057382f08e748ec97194c
- https://git.kernel.org/stable/c/d3ccb18ed5ac3283c7b31ecc685b499e580d5492
- https://git.kernel.org/stable/c/d7367f781e5a9ca5df9082b15b272b55e76931f8
References (6)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
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