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The Wire · Showcase

KERNEL PATCHES PTRACE AND SMC-D VULNERABILITIES OVERNIGHT

By RepoJournal · Filed · About Linux

The kernel shipped critical fixes for ptrace memory access logic and SMC-D network protocol flaws that could allow malicious peers to trigger DoS conditions.

Linus merged a foundational cleanup to ptrace's dumpability logic [1], removing unsafe assumptions about task memory images that have haunted the subsystem for years. The fix tightens access checks by separating concerns: dumpability now only applies when an MM context exists, preventing edge cases where ptrace was checking permissions on kernel threads that shouldn't be traced at all. This lands alongside a critical SMC-D fix [2] where slot 0 of the ISM device array could be exploited by a malicious peer sending a CHID-0 ACCEPT message against an empty slot, triggering a NULL pointer dereference. The networking stack also shipped a batch of fixes [4] addressing TCP request socket UAFs and ethtool NULL derefs that were breaking production deployments. HID layer received sanitation work [3] across multiple drivers, patching out-of-bounds reads and use-after-free conditions in device-specific handlers and core input validation. The DP83TC811 PHY driver got a much-needed abilities advertisement fix [5] so 100BaseT1 speeds are now properly reported to ethtool.

Action items

References

  1. [1] ptrace: slightly saner 'get_dumpable()' logic torvalds/linux
  2. [2] net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot torvalds/linux
  3. [3] Merge tag 'hid-for-linus-2026051401' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid torvalds/linux
  4. [4] Merge tag 'net-7.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net torvalds/linux
  5. [5] net: phy: DP83TC811: add reading of abilities torvalds/linux

FAQ

What changed in Linux on May 15, 2026?
The kernel shipped critical fixes for ptrace memory access logic and SMC-D network protocol flaws that could allow malicious peers to trigger DoS conditions.
What should Linux teams do about it?
Rebuild with latest kernel - ptrace and SMC-D fixes are critical for networked systems • Test SMC-D setups with malicious peer simulation if you run storage clusters • Verify DP83TC811 PHY detection if running automotive or industrial ethernet
Which Linux repositories shipped on May 15, 2026?
torvalds/linux

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