{"id":"CVE-2026-98119","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: break unbuffered write when netfs_alloc_subrequest() fails\n\nsyzbot reported a null-ptr-deref below [1] following a fault injection in\nnetfs_alloc_subrequest()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: break unbuffered write when netfs_alloc_subrequest() fails\n\nsyzbot reported a null-ptr-deref below [1] following a fault injection in\nnetfs_alloc_subrequest(). […","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 288ace2f57c9d06dd2e42bd80d03747d879a4068 < cf6f93b8b06acf57de62dacbe71a3b99c68656a7","Linux >= 288ace2f57c9d06dd2e42bd80d03747d879a4068 < 19f246c795e940dc5f11cd5bc0cb1e81bc7b7090","Linux >= 288ace2f57c9d06dd2e42bd80d03747d879a4068 < 8fb45a934661419c04a44d4cfea1e0df7dcf2805","Linux 6.10"],"published":"2026-09-25","updated":"2026-09-30","sourceUpdated":"2026-09-30T14:10:59.253","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98119","references":[{"url":"https://git.kernel.org/stable/c/19f246c795e940dc5f11cd5bc0cb1e81bc7b7090","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8fb45a934661419c04a44d4cfea1e0df7dcf2805","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cf6f93b8b06acf57de62dacbe71a3b99c68656a7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98119.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98119"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2541343"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98119"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98119"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98119.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00136,"epssPercentile":0.03032,"ingestedAt":"2026-09-25T11:06:38.821Z","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-476"],"slug":"CVE-2026-98119","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: break unbuffered write when netfs_alloc_subrequest() fails\n\nsyzbot reported a null-ptr-deref below [1] following a fault injection in\nnetfs_alloc_subrequest(). [0]\n\nWhen netfs_alloc_subrequest() fails, subreq is NULL.\nLater, netfs_prepare_write() tries to initialize members of\nsubreq(e.g., source), the issue in [1] is triggered.\n\nLet's handle the error of netfs_prepare_write() properly.\n\n[0]\nFAULT_INJECTION: forcing a failure.\nname failslab, interval 1, probability 0, space 0, times 0\nCall Trace:\n netfs_alloc_subrequest+0x116/0x3f0\n netfs_prepare_write+0x76/0x7b0\n netfs_unbuffered_write+0x75c/0x2020\n netfs_unbuffered_write_iter_locked+0x7d6/0xa80\n netfs_unbuffered_write_iter+0x442/0x720\n v9fs_file_write_iter+0xbf/0x100\n vfs_write+0x6ac/0x1050\n\n[1]\nKASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af]\nRIP: 0010:netfs_prepare_write+0xbc/0x7b0 fs/netfs/write_issue.c:173\nCall Trace:\n netfs_unbuffered_write+0x75c/0x2020 fs/netfs/direct_write.c:111\n netfs_unbuffered_write_iter_locked+0x7d6/0xa80 fs/netfs/direct_write.c:290\n netfs_unbuffered_write_iter+0x442/0x720 fs/netfs/direct_write.c:382\n v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:409\n new_sync_write fs/read_write.c:595 [inline]\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98119.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":224159,"id":"CVE-2026-98119","ts":1792324965330,"field":"cvss","old":null,"new":"5.5"},{"seq":224158,"id":"CVE-2026-98119","ts":1792324965330,"field":"severity","old":"none","new":"medium"}]}