Ubuntu.comUB:CVE-2021-46974CVE-2021-46974
In the Linux kernel, the following vulnerability has been resolved: bpf:
Fix masking negation logic upon negative dst register The negation logic
for the case where the off_reg is sitting in the dst register is not
correct given then we cannot just invert the add to a sub or vice versa. As
a fix, perform the final bitwise and-op unconditionally into AX from the
off_reg, then move the pointer from the src to dst and finally use AX as
the source for the original pointer arithmetic operation such that the
inversion yields a correct result. The single non-AX mov in between is
possible given constant blinding is retaining it as it’s not an immediate
based operation.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | linux | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux | < 5.4.0-77.86 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws | < any | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws | < 5.4.0-1051.53 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws-5.4 | < any | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-aws-hwe | < 4.15.0-1106.113~16.04.1 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure | < 5.4.0-1051.53 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-azure | < 4.15.0-1118.131~14.04.1 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-azure | < 4.15.0-1118.131~16.04.1 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-azure-4.15 | < any | UNKNOWN |
References
git.kernel.org/linus/b9b34ddbe2076ade359cd5ce7537d5ed019e9807 (5.13-rc1)
git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c
git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d
git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba
git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848
git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc
git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66
git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807
launchpad.net/bugs/cve/CVE-2021-46974
nvd.nist.gov/vuln/detail/CVE-2021-46974
security-tracker.debian.org/tracker/CVE-2021-46974
www.cve.org/CVERecord?id=CVE-2021-46974
Related
