Ubuntu.comUB:CVE-2019-19318CVE-2019-19318
4.4 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.001 Low
EPSS
Percentile
21.4%
In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause
an rwsem_down_write_slowpath use-after-free because (in
rwsem_can_spin_on_owner in kernel/locking/rwsem.c) rwsem_owner_flags
returns an already freed pointer,
Bugs
Notes
| Author | Note |
|---|---|
| tyhicks | Exploiting this vulnerability requires a crafted filesystem image to be mounted |
| sbeattie | possibly fixed by btrfs tree checker, which would mean it’s addressed for all kernels 4.4.x and newer. |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 19.10 | noarch | linux | < 5.3.0-22.24 | UNKNOWN |
| ubuntu | 19.10 | noarch | linux-aws | < 5.3.0-1007.8 | UNKNOWN |
| ubuntu | 19.10 | noarch | linux-azure | < 5.3.0-1007.8 | UNKNOWN |
| ubuntu | 19.10 | noarch | linux-gcp | < 5.3.0-1008.9 | UNKNOWN |
| ubuntu | 19.10 | noarch | linux-kvm | < 5.3.0-1007.8 | UNKNOWN |
| ubuntu | 19.10 | noarch | linux-oracle | < 5.3.0-1006.7 | UNKNOWN |
| ubuntu | 19.10 | noarch | linux-raspi2 | < 5.3.0-1012.14 | UNKNOWN |
Related
4.4 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.001 Low
EPSS
Percentile
21.4%