{"id":"CVE-2025-68796","state":"PUBLISHED","title":"f2fs: fix to avoid updating zero-sized extent in extent cache","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid updating zero-sized extent in extent cache\n\nAs syzbot reported:\n\nF2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0]\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/extent_cache.c:678!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678\nCall Trace:\n <TASK>\n f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085\n f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]\n f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737\n f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030\n vfs_fallocate+0x669/0x7e0 fs/open.c:342\n ioctl_preallocate fs/ioctl.c:289 [inline]\n file_ioctl+0x611/0x780 fs/ioctl.c:-1\n do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576\n __do_sys_ioctl fs/ioctl.c:595 [inline]\n __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f07bc58eec9\n\nIn error path of f2fs_zero_range(), it may add a zero-sized extent\ninto extent cache, it should be avoided.","publishedAt":"2026-01-13T15:29:06.892Z","updatedAt":"2026-05-11T21:53:30.248Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"9c07bd262c13ca922adad6e7613d48505f97f548","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"72c58a82e6fb7b327e8701f5786c70c3edc56188","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"e50b81c50fcbe63f50405bb40f262162ff32af88","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"efe3371001f50a2d6f746b50bdc6f9f26b2089ec","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"4f244c64efe628d277b916f47071adf480eb8646","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"bac23833220a1f8fe8dfab7e16efa20ff64d7589","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"7c37c79510329cd951a4dedf3f7bf7e2b18dccec","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/file.c"]}],"references":["https://git.kernel.org/stable/c/9c07bd262c13ca922adad6e7613d48505f97f548","https://git.kernel.org/stable/c/72c58a82e6fb7b327e8701f5786c70c3edc56188","https://git.kernel.org/stable/c/e50b81c50fcbe63f50405bb40f262162ff32af88","https://git.kernel.org/stable/c/efe3371001f50a2d6f746b50bdc6f9f26b2089ec","https://git.kernel.org/stable/c/4f244c64efe628d277b916f47071adf480eb8646","https://git.kernel.org/stable/c/bac23833220a1f8fe8dfab7e16efa20ff64d7589","https://git.kernel.org/stable/c/7c37c79510329cd951a4dedf3f7bf7e2b18dccec"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68796.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68796","state":"PUBLISHED","datePublished":"2026-01-13T15:29:06.892Z","dateUpdated":"2026-05-11T21:53:30.248Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-24T10:30:51.042Z"},"containers":{"cna":{"title":"f2fs: fix to avoid updating zero-sized extent in extent cache","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid updating zero-sized extent in extent cache\n\nAs syzbot reported:\n\nF2FS-fs (loop0): __update_extent_tree_range: extent len is zero, type: 0, extent [0, 0, 0], age [0, 0]\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/extent_cache.c:678!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:__update_extent_tree_range+0x13bc/0x1500 fs/f2fs/extent_cache.c:678\nCall Trace:\n <TASK>\n f2fs_update_read_extent_cache_range+0x192/0x3e0 fs/f2fs/extent_cache.c:1085\n f2fs_do_zero_range fs/f2fs/file.c:1657 [inline]\n f2fs_zero_range+0x10c1/0x1580 fs/f2fs/file.c:1737\n f2fs_fallocate+0x583/0x990 fs/f2fs/file.c:2030\n vfs_fallocate+0x669/0x7e0 fs/open.c:342\n ioctl_preallocate fs/ioctl.c:289 [inline]\n file_ioctl+0x611/0x780 fs/ioctl.c:-1\n do_vfs_ioctl+0xb33/0x1430 fs/ioctl.c:576\n __do_sys_ioctl fs/ioctl.c:595 [inline]\n __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f07bc58eec9\n\nIn error path of f2fs_zero_range(), it may add a zero-sized extent\ninto extent cache, it should be avoided."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"9c07bd262c13ca922adad6e7613d48505f97f548","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"72c58a82e6fb7b327e8701f5786c70c3edc56188","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"e50b81c50fcbe63f50405bb40f262162ff32af88","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"efe3371001f50a2d6f746b50bdc6f9f26b2089ec","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"4f244c64efe628d277b916f47071adf480eb8646","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"bac23833220a1f8fe8dfab7e16efa20ff64d7589","versionType":"git"},{"version":"6e9619499f53b22ead972e476c0e8341c997d929","status":"affected","lessThan":"7c37c79510329cd951a4dedf3f7bf7e2b18dccec","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/file.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.7","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.64","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.3","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/f2fs/file.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/9c07bd262c13ca922adad6e7613d48505f97f548"},{"url":"https://git.kernel.org/stable/c/72c58a82e6fb7b327e8701f5786c70c3edc56188"},{"url":"https://git.kernel.org/stable/c/e50b81c50fcbe63f50405bb40f262162ff32af88"},{"url":"https://git.kernel.org/stable/c/efe3371001f50a2d6f746b50bdc6f9f26b2089ec"},{"url":"https://git.kernel.org/stable/c/4f244c64efe628d277b916f47071adf480eb8646"},{"url":"https://git.kernel.org/stable/c/bac23833220a1f8fe8dfab7e16efa20ff64d7589"},{"url":"https://git.kernel.org/stable/c/7c37c79510329cd951a4dedf3f7bf7e2b18dccec"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:53:30.248Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.10.248"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.12.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.18.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.7","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}