CVE-2021-46974High· 7.1▾ TwilightIn 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 w…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Aug 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.2%
0.2% → 0.2%
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.
linux_kernel >= 4.14.113, < 4.14.233linux_kernel >= 4.19.19, < 4.19.190linux_kernel >= 5.0, < 5.4.117linux_kernel >= 5.5, < 5.10.35linux_kernel >= 5.11, < 5.11.19linux_kernel >= 5.12, < 5.12.2Upgrade past the affected range:
linux_kernel 5.12.2Connected by shared product, vendor, weakness, or advisory.
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