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Message-ID: <2024052433-CVE-2021-47521-8637@gregkh> Date: Fri, 24 May 2024 17:09:41 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2021-47521: can: sja1000: fix use after free in ems_pcmcia_add_card() Description =========== In the Linux kernel, the following vulnerability has been resolved: can: sja1000: fix use after free in ems_pcmcia_add_card() If the last channel is not available then "dev" is freed. Fortunately, we can just use "pdev->irq" instead. Also we should check if at least one channel was set up. The Linux kernel CVE team has assigned CVE-2021-47521 to this issue. Affected and fixed versions =========================== Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 4.4.295 with commit cbd86110546f Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 4.9.293 with commit 1dd5b819f7e4 Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 4.14.258 with commit c8718026ba28 Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 4.19.221 with commit ccf070183e46 Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 5.4.165 with commit 1a295fea90e1 Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 5.10.85 with commit 923f4dc5df67 Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 5.15.8 with commit 474f9a8534f5 Issue introduced in 3.2 with commit fd734c6f25ae and fixed in 5.16 with commit 3ec6ca6b1a8e 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-2021-47521 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/can/sja1000/ems_pcmcia.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/cbd86110546f7f730a1f5d7de56c944a336c15c4 https://git.kernel.org/stable/c/1dd5b819f7e406dc15bbc7670596ff25261aaa2a https://git.kernel.org/stable/c/c8718026ba287168ff9ad0ccc4f9a413062cba36 https://git.kernel.org/stable/c/ccf070183e4655824936c0f96c4a2bcca93419aa https://git.kernel.org/stable/c/1a295fea90e1acbe80c6d4940f5ff856edcd6bec https://git.kernel.org/stable/c/923f4dc5df679f678e121c20bf2fd70f7bf3e288 https://git.kernel.org/stable/c/474f9a8534f5f89841240a7e978bafd6e1e039ce https://git.kernel.org/stable/c/3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45
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