CVE-2024-26640

Summary

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

tcp: add sanity checks to rx zerocopy

TCP rx zerocopy intent is to map pages initially allocated from NIC drivers, not pages owned by a fs.

This patch adds to can_map_frag() these additional checks:

  • Page must not be a compound one.
  • page->mapping must be NULL.

This fixes the panic reported by ZhangPeng.

syzbot was able to loopback packets built with sendfile(), mapping pages owned by an ext4 file to TCP rx zerocopy.

r3 = socket$inet_tcp(0x2, 0x1, 0x0) mmap(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x12, r3, 0x0) r4 = socket$inet_tcp(0x2, 0x1, 0x0) bind$inet(r4, &(0x7f0000000000)={0x2, 0x4e24, @multicast1}, 0x10) connect$inet(r4, &(0x7f00000006c0)={0x2, 0x4e24, @empty}, 0x10) r5 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0) fallocate(r5, 0x0, 0x0, 0x85b8) sendfile(r4, r5, 0x0, 0x8ba0) getsockopt$inet_tcp_TCP_ZEROCOPY_RECEIVE(r4, 0x6, 0x23, &(0x7f00000001c0)={&(0x7f0000ffb000/0x3000)=nil, 0x3000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, &(0x7f0000000440)=0x40) r6 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0)

Affected Software

VendorProductVersion RangeStatus
LinuxLinux93ab6cc69162775201587cc9da00d5016dc890e2 < f48bf9a83b1666d934247cb58a9887d7b3127b6faffected
LinuxLinux93ab6cc69162775201587cc9da00d5016dc890e2 < 718f446e60316bf606946f7f42367d691d21541eaffected
LinuxLinux93ab6cc69162775201587cc9da00d5016dc890e2 < b383d4ea272fe5795877506dcce5aad1f6330e5eaffected
LinuxLinux93ab6cc69162775201587cc9da00d5016dc890e2 < d15cc0f66884ef2bed28c7ccbb11c102aa3a0760affected
LinuxLinux93ab6cc69162775201587cc9da00d5016dc890e2 < 1b8adcc0e2c584fec778add7777fe28e20781e60affected
LinuxLinux93ab6cc69162775201587cc9da00d5016dc890e2 < 577e4432f3ac810049cb7e6b71f4d96ec7c6e894affected
LinuxLinux4.18affected
LinuxLinux0 < 4.18unaffected
LinuxLinux5.10.210 <= 5.10.*unaffected
LinuxLinux5.15.149 <= 5.15.*unaffected
LinuxLinux6.1.77 <= 6.1.*unaffected
LinuxLinux6.6.16 <= 6.6.*unaffected
LinuxLinux6.7.4 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References