CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
Low
EPSS
Percentile
5.1%
In the Linux kernel, the following vulnerability has been resolved:
net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() In
mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and tmp->tx_cq
will be freed on the error path of mlx4_en_copy_priv(). After that
mlx4_en_alloc_resources() is called and there is a dereference of
&tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to a use
after free problem on failure of mlx4_en_copy_priv(). Fix this bug by
adding a check of mlx4_en_copy_priv() This bug was found by a static
analyzer. The analysis employs differential checking to identify
inconsistent security operations (e.g., checks or kfrees) between two code
paths and confirms that the inconsistent operations are not recovered in
the current function or the callers, so they constitute bugs. Note that, as
a bug found by static analysis, it can be a false positive or hard to
trigger. Multiple researchers have cross-reviewed the bug. Builds with
CONFIG_MLX4_EN=m show no new warnings, and our static analyzer no longer
warns about this code.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-aws-hwe | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 14.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 16.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 18.04 | noarch | linux-azure-4.15 | < any | UNKNOWN |
git.kernel.org/linus/addad7643142f500080417dd7272f49b7a185570 (5.16-rc4)
git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275
git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18
git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570
git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757
git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68
git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b
launchpad.net/bugs/cve/CVE-2021-47541
nvd.nist.gov/vuln/detail/CVE-2021-47541
security-tracker.debian.org/tracker/CVE-2021-47541
www.cve.org/CVERecord?id=CVE-2021-47541