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
Updated2026-05-21 14:16:48 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.000070000 probability, percentile 0.006830000 (date 2026-05-28)

Problem Types: CWE-269 | CWE-269 CWE-269 Improper Privilege Management

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 93d4ba49d18e3d7fb41a9927c2d0cca5e9dfefd6 git Not specified
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 15b828a46f305ae9f05a7c16914b3ce273474205 git Not specified
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 4709234fd1b95136ceb789f639b1e7ea5de1b181 git Not specified
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 8f907d345bae8f4b3f004c5abc56bf2dfb851ea7 git Not specified
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 6e5b51e74a40d377bcd3081dd33fbaa0e1aa7e3d git Not specified
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 2a93a4fac7b6051d3be7cd1b015fe7320cd0404d git Not specified
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 01363cb3fbd0238ffdeb09f53e9039c9edf8a730 git Not specified
CNA Linux Linux affected bfedb589252c01fa505ac9f6f2a3d5d68d707ef4 31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a git Not specified
CNA Linux Linux affected d5b3e840dbf6dd2c0f30b5982b6f5ecd49e46b12 git Not specified
CNA Linux Linux affected 03eed7afbc09e061f66b448daf7863174c3dc3f3 git Not specified
CNA Linux Linux affected e45692fa1aea06676449b63ef3c2b6e1e72b7578 git Not specified
CNA Linux Linux affected 694a95fa6dae4991f16cda333d897ea063021fed git Not specified
CNA Linux Linux affected 4.10 Not specified
CNA Linux Linux unaffected 4.10 semver 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
CNA Linux Linux unaffected 7.1-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/01363cb3fbd0238ffdeb09f53e9039c9edf8a730 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
www.openwall.com/lists/oss-security/2026/05/20/14 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
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
www.openwall.com/lists/oss-security/2026/05/20/16 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
git.kernel.org/stable/c/8f907d345bae8f4b3f004c5abc56bf2dfb851ea7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
lists.debian.org/debian-lts-announce/2026/05/msg00032.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.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
lists.debian.org/debian-lts-announce/2026/05/msg00035.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
github.com/0xdeadbeefnetwork/ssh-keysign-pwn 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
git.kernel.org/stable/c/4709234fd1b95136ceb789f639b1e7ea5de1b181 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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