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Message-ID: <2024102115-CVE-2024-47703-36ea@gregkh> Date: Mon, 21 Oct 2024 14:00:31 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-47703: bpf, lsm: Add check for BPF LSM return value Description =========== In the Linux kernel, the following vulnerability has been resolved: bpf, lsm: Add check for BPF LSM return value A bpf prog returning a positive number attached to file_alloc_security hook makes kernel panic. This happens because file system can not filter out the positive number returned by the LSM prog using IS_ERR, and misinterprets this positive number as a file pointer. Given that hook file_alloc_security never returned positive number before the introduction of BPF LSM, and other BPF LSM hooks may encounter similar issues, this patch adds LSM return value check in verifier, to ensure no unexpected value is returned. The Linux kernel CVE team has assigned CVE-2024-47703 to this issue. Affected and fixed versions =========================== Issue introduced in 5.7 with commit 520b7aa00d8c and fixed in 6.10.13 with commit 1050727d83e7 Issue introduced in 5.7 with commit 520b7aa00d8c and fixed in 6.11.2 with commit 27ca3e20fe80 Issue introduced in 5.7 with commit 520b7aa00d8c and fixed in 6.12-rc1 with commit 5d99e198be27 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2024-47703 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: include/linux/bpf.h include/linux/bpf_lsm.h kernel/bpf/bpf_lsm.c kernel/bpf/btf.c kernel/bpf/verifier.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/1050727d83e70449991c29dd1cf29fe936a63da3 https://git.kernel.org/stable/c/27ca3e20fe80be85a92b10064dfeb56cb2564b1c https://git.kernel.org/stable/c/5d99e198be279045e6ecefe220f5c52f8ce9bfd5
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