ptrace: slightly saner 'get_dumpable()' logic

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Summary

CVECVE-2026-46333
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-15 14:16:35 UTC
Updated2026-05-15 20:16:49 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ptrace: slightly saner 'get_dumpable()' logic The 'dumpability' of a task is fundamentally about the memory image of the task - the concept comes from whether it can core dump or not - and makes no sense when you don't have an associated mm. And almost all users do in fact use it only for the case where the task has a mm pointer. But we have one odd special case: ptrace_may_access() uses 'dumpable' to check various other things entirely independently of the MM (typically explicitly using flags like PTRACE_MODE_READ_FSCREDS). Including for threads that no longer have a VM (and maybe never did, like most kernel threads). It's not what this flag was designed for, but it is what it is. The ptrace code does check that the uid/gid matches, so you do have to be uid-0 to see kernel thread details, but this means that the traditional "drop capabilities" model doesn't make any difference for this all. Make it all make a *bit* more sense by saying that if you don't have a MM pointer, we'll use a cached "last dumpability" flag if the thread ever had a MM (it will be zero for kernel threads since it is never set), and require a proper CAP_SYS_PTRACE capability to override.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 93d4ba49d18e3d7fb41a9927c2d0cca5e9dfefd6 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 15b828a46f305ae9f05a7c16914b3ce273474205 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 4709234fd1b95136ceb789f639b1e7ea5de1b181 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 8f907d345bae8f4b3f004c5abc56bf2dfb851ea7 git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 6e5b51e74a40d377bcd3081dd33fbaa0e1aa7e3d git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 2a93a4fac7b6051d3be7cd1b015fe7320cd0404d git Not specified
CNA Linux Linux affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 01363cb3fbd0238ffdeb09f53e9039c9edf8a730 git Not specified
CNA Linux Linux unaffected 5.10.256 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.207 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.173 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.139 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.89 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.31 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.8 7.0.* semver Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/01363cb3fbd0238ffdeb09f53e9039c9edf8a730 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
www.openwall.com/lists/oss-security/2026/05/15/9 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
git.kernel.org/stable/c/2a93a4fac7b6051d3be7cd1b015fe7320cd0404d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8f907d345bae8f4b3f004c5abc56bf2dfb851ea7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/15b828a46f305ae9f05a7c16914b3ce273474205 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e5b51e74a40d377bcd3081dd33fbaa0e1aa7e3d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/93d4ba49d18e3d7fb41a9927c2d0cca5e9dfefd6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4709234fd1b95136ceb789f639b1e7ea5de1b181 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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