{"id":"CVE-2025-39697","title":"NFS: Fix a race when updating an existing write","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Fix a race when updating an existing write\n\nAfter nfs_lock_and_join_requests() tests for whether the request is\nstill attached to the mapping, nothing prevents a c…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 0ff42a32784e0f2cb46a46da8e9f473538c13e1b","Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < f230d40147cc37eb3aef4d50e2e2c06ea73d9a77","Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < c32e3c71aaa1c1ba05da88605e2ddd493c58794f","Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 181feb41f0b268e6288bf9a7b984624d7fe2031d","Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 92278ae36935a54e65fef9f8ea8efe7e80481ace","Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 202a3432d21ac060629a760fff3b0a39859da3ea","Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 76d2e3890fb169168c73f2e4f8375c7cc24a765e","Linux 4.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-10T20:42:24.236193Z"},"published":"2025-09-05","updated":"2026-10-15","sourceUpdated":"2026-10-15T01:08:03.870Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39697","references":[{"url":"https://git.kernel.org/stable/c/0ff42a32784e0f2cb46a46da8e9f473538c13e1b"},{"url":"https://git.kernel.org/stable/c/f230d40147cc37eb3aef4d50e2e2c06ea73d9a77"},{"url":"https://git.kernel.org/stable/c/c32e3c71aaa1c1ba05da88605e2ddd493c58794f"},{"url":"https://git.kernel.org/stable/c/181feb41f0b268e6288bf9a7b984624d7fe2031d"},{"url":"https://git.kernel.org/stable/c/92278ae36935a54e65fef9f8ea8efe7e80481ace"},{"url":"https://git.kernel.org/stable/c/202a3432d21ac060629a760fff3b0a39859da3ea"},{"url":"https://git.kernel.org/stable/c/76d2e3890fb169168c73f2e4f8375c7cc24a765e"}],"tags":["cve.org"],"epss":0.00153,"epssPercentile":0.04386,"ingestedAt":"2026-10-15T05:52:46.079Z","slug":"CVE-2025-39697","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Fix a race when updating an existing write\n\nAfter nfs_lock_and_join_requests() tests for whether the request is\nstill attached to the mapping, nothing prevents a call to\nnfs_inode_remove_request() from succeeding until we actually lock the\npage group.\nThe reason is that whoever called nfs_inode_remove_request() doesn't\nnecessarily have a lock on the page group head.\n\nSo in order to avoid races, let's take the page group lock earlier in\nnfs_lock_and_join_requests(), and hold it across the removal of the\nrequest in nfs_inode_remove_request().\n\n## Affected\n\n- `Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 0ff42a32784e0f2cb46a46da8e9f473538c13e1b`\n- `Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < f230d40147cc37eb3aef4d50e2e2c06ea73d9a77`\n- `Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < c32e3c71aaa1c1ba05da88605e2ddd493c58794f`\n- `Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 181feb41f0b268e6288bf9a7b984624d7fe2031d`\n- `Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 92278ae36935a54e65fef9f8ea8efe7e80481ace`\n- `Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 202a3432d21ac060629a760fff3b0a39859da3ea`\n- `Linux >= bd37d6fce184836bd5e7cd90ce40116a4fadaf2a < 76d2e3890fb169168c73f2e4f8375c7cc24a765e`\n- `Linux 4.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}