libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo()

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Summary

CVECVE-2026-64596
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-06 08:16:35 UTC
Updated2026-08-17 05:18:06 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo() Since commit 1e7ab6f67824 ("anon_inode: rework assertions"), path_noexec() warns when an anonymous-inode file is mmap'd from a superblock that has not set SB_I_NOEXEC. dma-buf backs its files this way and never set the flag, so mmap of any exported buffer trips the warning on a CONFIG_DEBUG_VFS=y kernel: WARNING: CPU: 11 PID: 121813 at fs/exec.c:118 path_noexec+0x47/0x50 do_mmap+0x2b5/0x680 vm_mmap_pgoff+0x129/0x210 ksys_mmap_pgoff+0x177/0x240 __x64_sys_mmap+0x33/0x70 init_pseudo() sets up internal SB_NOUSER mounts that are never path-reachable. Set both flags here so every pseudo filesystem gets them by default instead of each caller setting them. SB_I_NODEV is inert for unreachable mounts. SB_I_NOEXEC has one visible effect: an executable mapping of a pseudo-fs fd, such as a dma-buf, now fails with -EPERM, which is the invariant the assertion enforces. No in-tree caller maps these executable. Reproduce on CONFIG_DEBUG_VFS=y: make -C tools/testing/selftests/dmabuf-heaps sudo ./tools/testing/selftests/dmabuf-heaps/dmabuf-heap -t system

Risk And Classification

EPSS: 0.001540000 probability, percentile 0.051100000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1e7ab6f67824343ee3e96f100f0937c393749a8a b9d45d328fcda4f0d3d281b7d6f12d3f181d9381 git Not specified
CNA Linux Linux affected 1e7ab6f67824343ee3e96f100f0937c393749a8a 8e931557b317f0fb414839fa51fae1d5feb0ad97 git Not specified
CNA Linux Linux affected 1e7ab6f67824343ee3e96f100f0937c393749a8a 6de2aeffabaafaeda819e60ec8d04f199711e11a git Not specified
CNA Linux Linux affected 9b8076a9404568d6cb6673b9a079558b15051966 git Not specified
CNA Linux Linux affected 6.15.6 6.16 semver Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b9d45d328fcda4f0d3d281b7d6f12d3f181d9381 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6de2aeffabaafaeda819e60ec8d04f199711e11a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e931557b317f0fb414839fa51fae1d5feb0ad97 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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