netfilter: nf_tables: fix dst corruption in same register operation
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.143, 6.12.114, 6.18.35, 7.0.12
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix dst corruption in same register operation For lshift and rshift, the shift operations are performed in a loop over 32-bit words. The loop calculates the shifted value and write it to dst, and then immediately reads from src to calculate the carry for the next iteration. Because src and dst could point to the same memory location, the carry is incorrectly calculated using the newly modified dst value instead of the original src value. Adding a temporary local variable to cache the original value before writing to dst and using it for the carry calculation solves the problem. In addition, partial overlap is rejected from control plane for all kind of operations including byteorder. This was tested with the following bytecode: table test_table ip flags 0 use 1 handle 1 ip test_table test_chain use 3 type filter hook input prio 0 policy accept packets 0 bytes 0 flags 1 ip test_table test_chain 2 [ immediate reg 1 0x44332211 0x88776655 ] [ bitwise reg 1 = ( reg 1 << 0x08000000 ) ] [ cmp eq reg 1 0x66443322 0x00887766 ] [ counter pkts 0 bytes 0 ] ip test_table test_chain 4 3 [ immediate reg 1 0x44332211 0x88776655 ] [ bitwise reg 1 = ( reg 1 << 0x08000000 ) ] [ cmp eq reg 1 0x55443322 0x00887766 ] [ counter pkts 21794 bytes 1917798 ]
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 · fixed in b80ef316e978de2ef81d5bee9c19800b4cf96fb8; From 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 · fixed in 379ff8d40f59632bea1208956629c2a04067d403; From 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 · fixed in 96bea2a7baac4a1137c188dc7610184487ab30a7; From 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 · fixed in a391afe74398b70107f111aa731eab608624949d; From 567d746b55bc66d3800c9ae91d50f0c5deb2fd93 · fixed in 18014147d3ee7831dce53fe65d7fc8d428b02552
- Linux Linux
5.6
- KernelLinux
From 5.6.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.114; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12