Riskcovery

CVE-2024-26640

tcp: add sanity checks to rx zerocopy

State
Published
Severity
7.8 High
Published
Mar 18, 2024
Updated
Aug 5, 2026
Reserved
Feb 19, 2024

Read the record on cve.org

Description

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)

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 93ab6cc69162775201587cc9da00d5016dc890e2 to before f48bf9a83b1666d934247cb58a9887d7b3127b6fAffected
  • 93ab6cc69162775201587cc9da00d5016dc890e2 to before 718f446e60316bf606946f7f42367d691d21541eAffected
  • 93ab6cc69162775201587cc9da00d5016dc890e2 to before b383d4ea272fe5795877506dcce5aad1f6330e5eAffected
  • 93ab6cc69162775201587cc9da00d5016dc890e2 to before d15cc0f66884ef2bed28c7ccbb11c102aa3a0760Affected
  • 93ab6cc69162775201587cc9da00d5016dc890e2 to before 1b8adcc0e2c584fec778add7777fe28e20781e60Affected
  • 93ab6cc69162775201587cc9da00d5016dc890e2 to before 577e4432f3ac810049cb7e6b71f4d96ec7c6e894Affected
LinuxLinux
  • 4.18Affected
  • before 4.18Not affected
  • 5.10.210 through 5.10.*Not affected
  • 5.15.149 through 5.15.*Not affected
  • 6.1.77 through 6.1.*Not affected
  • 6.6.16 through 6.6.*Not affected
  • 6.7.4 through 6.7.*Not affected
  • 6.8 and laterNot affected

References

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