CVE-2023-52676

bpf: Guard stack limits against 32bit overflow

CVSS 3.1 7.8 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2023-52676

Published

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

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2023-52676

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/verifier.c"
                    ],
                    "versions": [
                        {
                            "version": "f3c4b01689d392373301e6e60d1b02c5b4020afc",
                            "lessThan": "ad1754f86a87fe74912fb542b23ff24ada4e3307",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "01f810ace9ed37255f27608a0864abebccf0aab3",
                            "lessThan": "4ba97610399e83d29d1086a0827d33172539b49b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "01f810ace9ed37255f27608a0864abebccf0aab3",
                            "lessThan": "e160b2ed94a20fa940369ebd914277f88005e70d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "01f810ace9ed37255f27608a0864abebccf0aab3",
                            "lessThan": "ad140fc856f0b1d5e2215bcb6d0cc247a86805a2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "01f810ace9ed37255f27608a0864abebccf0aab3",
                            "lessThan": "e5ad9ecb84405637df82732ee02ad741a5f782a6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "01f810ace9ed37255f27608a0864abebccf0aab3",
                            "lessThan": "1d38a9ee81570c4bd61f557832dead4d6f816760",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d1b725ea5d104caea250427899f4e2e3ab15b4fc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.10.33",
                            "lessThan": "5.10.270",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.11.17",
                            "lessThan": "5.12",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/verifier.c"
                    ],
                    "versions": [
                        {
                            "version": "5.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.270",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.14",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.7.2",
                            "lessThanOrEqual": "6.7.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.8",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON