UBUNTU-CVE-2026-46333
In 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.
02 / AFFECTED SOFTWARE
Affected packages
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11 explicit affected versions
10 explicit affected versions
8 explicit affected versions
43 explicit affected versions
14 explicit affected versions
4 explicit affected versions
78 explicit affected versions
12 explicit affected versions
11 explicit affected versions
1 explicit affected versions
17 explicit affected versions
2 explicit affected versions
37 explicit affected versions
75 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In 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.
05 / REFERENCES
Further evidence
- https://cdn2.qualys.com/advisory/2026/05/20/cve-2026-46333-ptrace.txt
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a
- https://github.com/0xdeadbeefnetwork/ssh-keysign-pwn
- https://github.com/torvalds/linux/commit/31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a
- https://ubuntu.com/blog/ssh-keysign-pwn-linux-vulnerability-fixes-available
- https://ubuntu.com/security/CVE-2026-46333
- https://ubuntu.com/security/notices/USN-8370-1
- https://ubuntu.com/security/notices/USN-8371-1
- https://ubuntu.com/security/notices/USN-8373-1
- https://ubuntu.com/security/notices/USN-8374-1
- https://ubuntu.com/security/notices/USN-8388-1
- https://ubuntu.com/security/notices/USN-8388-2
- https://ubuntu.com/security/notices/USN-8393-1
- https://ubuntu.com/security/notices/USN-8426-1
- https://ubuntu.com/security/notices/USN-8426-2
- https://ubuntu.com/security/notices/USN-8440-1
- https://ubuntu.com/security/notices/USN-8461-1
- https://ubuntu.com/security/notices/USN-8462-1
- https://ubuntu.com/security/notices/USN-8489-1
- https://ubuntu.com/security/notices/USN-8497-1
- https://ubuntu.com/security/notices/USN-8499-1
- https://ubuntu.com/security/notices/USN-8528-1
- https://ubuntu.com/security/notices/USN-8569-1
- https://www.cve.org/CVERecord?id=CVE-2026-46333
- https://www.openwall.com/lists/oss-security/2026/05/15/2
- https://www.openwall.com/lists/oss-security/2026/05/15/8
- https://x.com/spendergrsec/status/2054974174926430322