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Message-ID: <2024052139-CVE-2021-47368-1290@gregkh> Date: Tue, 21 May 2024 17:03:45 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2021-47368: enetc: Fix illegal access when reading affinity_hint Description =========== In the Linux kernel, the following vulnerability has been resolved: enetc: Fix illegal access when reading affinity_hint irq_set_affinity_hit() stores a reference to the cpumask_t parameter in the irq descriptor, and that reference can be accessed later from irq_affinity_hint_proc_show(). Since the cpu_mask parameter passed to irq_set_affinity_hit() has only temporary storage (it's on the stack memory), later accesses to it are illegal. Thus reads from the corresponding procfs affinity_hint file can result in paging request oops. The issue is fixed by the get_cpu_mask() helper, which provides a permanent storage for the cpumask_t parameter. The Linux kernel CVE team has assigned CVE-2021-47368 to this issue. Affected and fixed versions =========================== Issue introduced in 5.1 with commit d4fd0404c1c9 and fixed in 5.4.150 with commit 4c4c3052911b Issue introduced in 5.1 with commit d4fd0404c1c9 and fixed in 5.10.70 with commit 6c3f1b741c6c Issue introduced in 5.1 with commit d4fd0404c1c9 and fixed in 5.14.9 with commit 6f329d9da2a5 Issue introduced in 5.1 with commit d4fd0404c1c9 and fixed in 5.15 with commit 7237a494decf 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-2021-47368 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: drivers/net/ethernet/freescale/enetc/enetc.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/4c4c3052911b577920353a7646e4883d5da40c28 https://git.kernel.org/stable/c/6c3f1b741c6c2914ea120e3a5790d3e900152f7b https://git.kernel.org/stable/c/6f329d9da2a5ae032fcde800a99b118124ed5270 https://git.kernel.org/stable/c/7237a494decfa17d0b9d0076e6cee3235719de90
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