CVE-2022-50288
In the Linux kernel, the following vulnerability has been resolved: qlcnic: prevent ->dcb use-after-free on qlcnic_dcb_enable() failure adapter->dcb would get silently freed inside qlcnic_dcb_enable() in case qlcnic_dcb_attach() would return an error,…
Does this matter?
Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: qlcnic: prevent ->dcb use-after-free on qlcnic_dcb_enable() failure adapter->dcb would get silently freed inside qlcnic_dcb_enable() in case qlcnic_dcb_attach() would return an error, which always happens under OOM conditions. This would lead to use-after-free because both of the existing callers invoke qlcnic_dcb_get_info() on the obtained pointer, which is potentially freed at that point. Propagate errors from qlcnic_dcb_enable(), and instead free the dcb pointer at callsite using qlcnic_dcb_free(). This also removes the now unused qlcnic_clear_dcb_ops() helper, which was a simple wrapper around kfree() also causing memory leaks for partially initialized dcb. Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.16% probability · 5th 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/13a7c8964afcd8ca43c0b6001ebb0127baa95362Patch
- https://git.kernel.org/stable/c/36999236f0b12d5de21a6f40e93b570727b9ceb2Patch
- https://git.kernel.org/stable/c/513787ff9a331b461115e8a145a983d650a84fcbPatch
- https://git.kernel.org/stable/c/8df1dc04ce0e4c03b51a756749c250a9cb17d707Patch
- https://git.kernel.org/stable/c/8f97eeb02a553cdc78c83a0596448a370e1518c4Patch
- https://git.kernel.org/stable/c/95df720e64a6409d8152827a776c43f615e3321aPatch
- https://git.kernel.org/stable/c/a2a694e6edbdb3efb34e1613a31fdcf6cf444a55Patch
- https://git.kernel.org/stable/c/d12a7510293d3370b234b0b7c5eda33e58786768Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.