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Message-ID: <2025103015-CVE-2025-40087-ff33@gregkh> Date: Thu, 30 Oct 2025 10:48:14 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-40087: NFSD: Define a proc_layoutcommit for the FlexFiles layout type From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: NFSD: Define a proc_layoutcommit for the FlexFiles layout type Avoid a crash if a pNFS client should happen to send a LAYOUTCOMMIT operation on a FlexFiles layout. The Linux kernel CVE team has assigned CVE-2025-40087 to this issue. Affected and fixed versions =========================== Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 5.4.301 with commit a75994dd879401c3e24ff51c2536559f1a53ea27 Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 5.10.246 with commit 34d187e020cbda112a6c6f094f0ca5e6a8672b75 Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 5.15.196 with commit ba88a53d7f5df4191583abf214214efe0cda91d2 Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 6.1.158 with commit da9129ef77786839a3ccd1d7afeeab790bceaa1d Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 6.6.114 with commit f7353208c91ab004e0179c5fb6c365b0f132f9f0 Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 6.12.55 with commit a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4 Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 6.17.5 with commit 785ec512afa80d0540f2ca797c0e56de747a6083 Issue introduced in 4.8 with commit 9b9960a0ca4773e21c4b153ed355583946346b25 and fixed in 6.18-rc2 with commit 4b47a8601b71ad98833b447d465592d847b4dc77 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-2025-40087 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: fs/nfsd/flexfilelayout.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/a75994dd879401c3e24ff51c2536559f1a53ea27 https://git.kernel.org/stable/c/34d187e020cbda112a6c6f094f0ca5e6a8672b75 https://git.kernel.org/stable/c/ba88a53d7f5df4191583abf214214efe0cda91d2 https://git.kernel.org/stable/c/da9129ef77786839a3ccd1d7afeeab790bceaa1d https://git.kernel.org/stable/c/f7353208c91ab004e0179c5fb6c365b0f132f9f0 https://git.kernel.org/stable/c/a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4 https://git.kernel.org/stable/c/785ec512afa80d0540f2ca797c0e56de747a6083 https://git.kernel.org/stable/c/4b47a8601b71ad98833b447d465592d847b4dc77
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