CVE-2023-52462: bpf: fix check for attempt to corrupt spilled pointer
First published: Fri Feb 23 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.8 | 6.8 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 | |
| Linux Kernel | <5.10.209 | |
| Linux Kernel | >=5.11.0<5.15.148 | |
| Linux Kernel | >=5.16.0<6.1.75 | |
| Linux Kernel | >=6.2.0<6.6.14 | |
| Linux Kernel | >=6.7.0<6.7.2 |
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Reference Links
- https://git.kernel.org/stable/c/2757f17972d87773b3677777f5682510f13c66ef
- https://git.kernel.org/stable/c/40617d45ea05535105e202a8a819e388a2b1f036
- https://git.kernel.org/stable/c/67e6707f07354ed1acb4e65552e97c60cf9d69cf
- https://git.kernel.org/stable/c/8dc15b0670594543c356567a1a45b0182ec63174
- https://git.kernel.org/stable/c/ab125ed3ec1c10ccc36bc98c7a4256ad114a3dae
- https://git.kernel.org/stable/c/fc3e3c50a0a4cac1463967c110686189e4a59104
- https://launchpad.net/bugs/cve/CVE-2023-52462
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2265810
- https://access.redhat.com/security/cve/CVE-2023-52462
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2265798
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-52462
- https://nvd.nist.gov/vuln/detail/CVE-2023-52462
- https://security-tracker.debian.org/tracker/CVE-2023-52462
- https://ubuntu.com/security/CVE-2023-52462
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html
- https://git.kernel.org/linus/ab125ed3ec1c10ccc36bc98c7a4256ad114a3dae
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