# CVE-2023-52582: linux: In the Linux kernel, the following vulnerability has been resolved: netfs: Only call folio_start_fscache() one time... CVE-2023-52582 is fixed in 21 products on 1 platform, first by ALAS2023-2023-385, released October 12, 2023. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2023-52582 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0023 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 12, 2023 ## Description In the Linux kernel, the following vulnerability has been resolved: netfs: Only call folio_start_fscache() one time for each folio If a network filesystem using netfs implements a clamp_length() function, it can set subrequest lengths smaller than a page size. When we loop through the folios in netfs_rreq_unlock_folios() to set any folios to be written back, we need to make sure we only call folio_start_fscache() once for each folio. Otherwise, this simple testcase: mount -o fsc,rsize=1024,wsize=1024 127.0.0.1:/export /mnt/nfs dd if=/dev/zero of=/mnt/nfs/file.bin bs=4096 count=1 1+0 records in 1+0 records out 4096 bytes (4.1 kB, 4.0 KiB) copied, 0.0126359 s, 324 kB/s echo 3 > /proc/sys/vm/drop_caches cat /mnt/nfs/file.bin > /dev/null will trigger an oops similar to the following: page dumped because: VM_BUG_ON_FOLIO(folio_test_private_2(folio)) ------------[ cut here ]------------ kernel BUG at include/linux/netfs.h:44! ... CPU: 5 PID: 134 Comm: kworker/u16:5 Kdump: loaded Not tainted 6.4.0-rc5 ... RIP: 0010:netfs_rreq_unlock_folios+0x68e/0x730 [netfs] ... Call Trace: netfs_rreq_assess+0x497/0x660 [netfs] netfs_subreq_terminated+0x32b/0x610 [netfs] nfs_netfs_read_completion+0x14e/0x1a0 [nfs] nfs_read_completion+0x2f9/0x330 [nfs] rpc_free_task+0x72/0xa0 [sunrpc] rpc_async_release+0x46/0x70 [sunrpc] process_one_work+0x3bd/0x710 worker_thread+0x89/0x610 kthread+0x181/0x1c0 ret_from_fork+0x29/0x50 ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-debuginfo amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-devel amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-headers amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-libbpf amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-livepatch-6.1.56-82.125 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-modules-extra amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-tools amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | kernel-tools-devel amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | linux Debian 12.15 (bookworm) | 6.1.64-1 | [DEBIAN-CVE-2023-52582](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52582.md) | Mar 2, 2024 | | Linux | linux Debian 13.5 (trixie) | 6.5.6-1 | [DEBIAN-CVE-2023-52582](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52582.md) | Mar 2, 2024 | | Linux | linux Debian 14 | 6.5.6-1 | [DEBIAN-CVE-2023-52582](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52582.md) | Mar 2, 2024 | | Linux | perf amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | perf-debuginfo amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | python3-perf amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.56-82.125.amzn2023 | [ALAS2023-2023-385](https://patchblox.com/security/data/fix/linux/alas2023-2023-385.md) | Oct 12, 2023 | --- Data as of 2026-11-09T07:25:28Z UTC. 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