In the Linux kernel, the following vulnerability has been resolved: bpf:
Guard stack limits against 32bit overflow This patch promotes the
arithmetic around checking stack bounds to be done in the 64-bit domain,
instead of the current 32bit. The arithmetic implies adding together a
64-bit register with a int offset. The register was checked to be below
1<<29 when it was variable, but not when it was fixed. The offset either
comes from an instruction (in which case it is 16 bit), from another
register (in which case the caller checked it to be below 1<<29 [1]), or
from the size of an argument to a kfunc (in which case it can be a u32
[2]). Between the register being inconsistently checked to be below 1<<29,
and the offset being up to an u32, it appears that we were open to
overflowing the int
s which were currently used for arithmetic. [1]
https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L7494-L7498
[2]
https://github.com/torvalds/linux/blob/815fb87b753055df2d9e50f6cd80eb10235fe3e9/kernel/bpf/verifier.c#L11904
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 20.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux | < any | UNKNOWN |
ubuntu | 23.10 | noarch | linux | < 6.5.0-41.41 | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-aws | < any | UNKNOWN |
ubuntu | 23.10 | noarch | linux-aws | < 6.5.0-1021.21 | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws-5.15 | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-aws-6.5 | < any | UNKNOWN |
ubuntu | 20.04 | noarch | linux-azure | < any | UNKNOWN |
ubuntu | 22.04 | noarch | linux-azure | < any | UNKNOWN |
git.kernel.org/linus/1d38a9ee81570c4bd61f557832dead4d6f816760 (6.8-rc1)
git.kernel.org/stable/c/1d38a9ee81570c4bd61f557832dead4d6f816760
git.kernel.org/stable/c/ad140fc856f0b1d5e2215bcb6d0cc247a86805a2
git.kernel.org/stable/c/e5ad9ecb84405637df82732ee02ad741a5f782a6
launchpad.net/bugs/cve/CVE-2023-52676
nvd.nist.gov/vuln/detail/CVE-2023-52676
security-tracker.debian.org/tracker/CVE-2023-52676
ubuntu.com/security/notices/USN-6818-1
ubuntu.com/security/notices/USN-6818-2
ubuntu.com/security/notices/USN-6818-3
ubuntu.com/security/notices/USN-6818-4
ubuntu.com/security/notices/USN-6819-1
ubuntu.com/security/notices/USN-6819-2
ubuntu.com/security/notices/USN-6819-3
ubuntu.com/security/notices/USN-6819-4
www.cve.org/CVERecord?id=CVE-2023-52676