CVE-2026-43269

In the Linux kernel, the following vulnerability has been resolved:

drm/atmel-hlcdc: fix memory leak from the atomic_destroy_state callback

After several commits, the slab memory increases. Some drm_crtc_commit objects are not freed. The atomic_destroy_state callback only put the framebuffer. Use the __drm_atomic_helper_plane_destroy_state() function to put all the objects that are no longer needed.

It has been seen after hours of usage of a graphics application or using kmemleak:

unreferenced object 0xc63a6580 (size 64): comm egt_basic, pid 171, jiffies 4294940784 hex dump (first 32 bytes): 40 50 34 c5 01 00 00 00 ff ff ff ff 8c 65 3a c6 @P4……….e:. 8c 65 3a c6 ff ff ff ff 98 65 3a c6 98 65 3a c6 .e:……e:..e:. backtrace (crc c25aa925): kmemleak_alloc+0x34/0x3c __kmalloc_cache_noprof+0x150/0x1a4 drm_atomic_helper_setup_commit+0x1e8/0x7bc drm_atomic_helper_commit+0x3c/0x15c drm_atomic_commit+0xc0/0xf4 drm_atomic_helper_set_config+0x84/0xb8 drm_mode_setcrtc+0x32c/0x810 drm_ioctl+0x20c/0x488 sys_ioctl+0x14c/0xc20 ret_fast_syscall+0x0/0x54

Weakness

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Affected Software

Potential Mitigations

• Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
• For example, glibc in Linux provides protection against free of invalid pointers.
• When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
• To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References

• https://git.kernel.org/stable/c/082271e364a3205598c2e4e6233a9f49ce7941cf
• https://git.kernel.org/stable/c/25e832a7830740e72103eb0b527680a4b64bbcb3
• https://git.kernel.org/stable/c/3e64e78f4a70e3f6ac8fe5a7071f08ffd25a2489
• https://git.kernel.org/stable/c/5718d98976ad6b9700e5a6afec67fc47a8a92580
• https://git.kernel.org/stable/c/57fa3487acfa3467405f8506b94682abd96e7393
• https://git.kernel.org/stable/c/6d4e91ab97fda64e8cf9c8881cc3b4da026bd849
• https://git.kernel.org/stable/c/ec40702029b08ee8d5f5b03303d64a10e74a957b
• https://git.kernel.org/stable/c/f12352471061df83a36edf54bbb16284793284e4