{"id":"CVE-2026-72355","state":"PUBLISHED","title":"netfs: Fix barriering when walking subrequest list","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix barriering when walking subrequest list\n\nFix the barriering used when walking the subrequest list in retry as\nthere's a possibility of seeing a subreq that's just been added by the\napplication thread.","publishedAt":"2026-08-15T05:55:56.812Z","updatedAt":"2026-09-21T13:13:45.795Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","status":"affected","lessThan":"4cca4b44e561a19c77cb1949ae6846da0539db40","versionType":"git"},{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","status":"affected","lessThan":"be47c047250671c9225c0319ca4695be9b391c59","versionType":"git"},{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","status":"affected","lessThan":"5c6ce05e406520290c1d89da97fb3cd70c09137d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/read_retry.c","fs/netfs/write_retry.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/read_retry.c","fs/netfs/write_retry.c"]}],"references":["https://git.kernel.org/stable/c/4cca4b44e561a19c77cb1949ae6846da0539db40","https://git.kernel.org/stable/c/be47c047250671c9225c0319ca4695be9b391c59","https://git.kernel.org/stable/c/5c6ce05e406520290c1d89da97fb3cd70c09137d"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72355.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72355","state":"PUBLISHED","datePublished":"2026-08-15T05:55:56.812Z","dateUpdated":"2026-09-21T13:13:45.795Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.921Z"},"containers":{"cna":{"title":"netfs: Fix barriering when walking subrequest list","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Fix barriering when walking subrequest list\n\nFix the barriering used when walking the subrequest list in retry as\nthere's a possibility of seeing a subreq that's just been added by the\napplication thread."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","status":"affected","lessThan":"4cca4b44e561a19c77cb1949ae6846da0539db40","versionType":"git"},{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","status":"affected","lessThan":"be47c047250671c9225c0319ca4695be9b391c59","versionType":"git"},{"version":"288ace2f57c9d06dd2e42bd80d03747d879a4068","status":"affected","lessThan":"5c6ce05e406520290c1d89da97fb3cd70c09137d","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/read_retry.c","fs/netfs/write_retry.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.10","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.10","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/netfs/read_retry.c","fs/netfs/write_retry.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4cca4b44e561a19c77cb1949ae6846da0539db40"},{"url":"https://git.kernel.org/stable/c/be47c047250671c9225c0319ca4695be9b391c59"},{"url":"https://git.kernel.org/stable/c/5c6ce05e406520290c1d89da97fb3cd70c09137d"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","value":"AV:N - The flaw is in the netfs client retry path used by SMB/CIFS, Ceph, NFS+fscache, and AFS; a remote malicious or MITM file server can trigger NEED_RETRY via short/error network responses during client read/write I/O.\nAC:L - The attacker controls both sides of the race by timing retry-inducing server responses and issuing concurrent reads/writes (multiple threads/fds); no victim-specific memory layout or rare uncontrollable state is required beyond normal mounted-FS I/O.\nPR:N - No local privileges on the victim are required; a remote attacker operating a malicious or compromised SMB/Ceph/NFS/AFS server can exploit any client with an active mount performing file I/O, without shell or admin access on the client.\nUI:N - On commonly pre-mounted enterprise/automounted network shares, kernel readahead and writeback can reach the buggy retry path without additional victim action at exploitation time beyond existing background file access.\nS:U - Exploitation corrupts the client kernel heap and enables local privilege escalation within the same kernel security domain; it does not by itself cross a VM/host or IOMMU boundary.\nC:H - Observing partially published subrequest entries yields stale start/len/flags/io_iter values, causing out-of-bounds kernel reads and information disclosure from adjacent memory via mis-sized iterators.\nI:H - Corrupted subrequest metadata drives wrong-span reissue_read/write, erroneous list deletion, and refcount manipulation, providing heap corruption primitives that can be leveraged for arbitrary kernel writes and code execution.\nA:H - Incorrect list traversal and mis-issued I/O can cause use-after-free, refcount underflow, kernel oops, or panic, reliably crashing or hanging the affected system."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-09-21T13:13:45.795Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}