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PUBLISHED

CVE-2023-52462

bpf: fix check for attempt to corrupt spilled pointer

Reserved:2024-02-20
Published:2024-02-23
Updated:2024-04-04

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: fix check for attempt to corrupt spilled pointer When register is spilled onto a stack as a 1/2/4-byte register, we set slot_type[BPF_REG_SIZE - 1] (plus potentially few more below it, depending on actual spill size). So to check if some stack slot has spilled register we need to consult slot_type[7], not slot_type[0]. To avoid the need to remember and double-check this in the future, just use is_spilled_reg() helper.

Product status

Default status
unaffected

cdd73a5ed084 before 2757f17972d8
affected

07c286c10a9c before 67e6707f0735
affected

27113c59b6d0 before fc3e3c50a0a4
affected

27113c59b6d0 before 8dc15b067059
affected

27113c59b6d0 before 40617d45ea05
affected

27113c59b6d0 before ab125ed3ec1c
affected

Default status
affected

5.16
affected

Any version before 5.16
unaffected

5.10.209
unaffected

5.15.148
unaffected

6.1.75
unaffected

6.6.14
unaffected

6.7.2
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/2757f17972d87773b3677777f5682510f13c66ef

https://git.kernel.org/stable/c/67e6707f07354ed1acb4e65552e97c60cf9d69cf

https://git.kernel.org/stable/c/fc3e3c50a0a4cac1463967c110686189e4a59104

https://git.kernel.org/stable/c/8dc15b0670594543c356567a1a45b0182ec63174

https://git.kernel.org/stable/c/40617d45ea05535105e202a8a819e388a2b1f036

https://git.kernel.org/stable/c/ab125ed3ec1c10ccc36bc98c7a4256ad114a3dae

cve.org CVE-2023-52462

nvd.nist.gov CVE-2023-52462

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