CVE-2024-26640

tcp: add sanity checks to rx zerocopy

MEDIUM

5.5

CVSS Score

Published: March 18, 2024 at 10:19 AM UTC

Updated: August 5, 2026 at 12:04 PM UTC

2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

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)

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

10.0

Linux Kernel · Linux

95%

4.18 ≤ v < 5.10.2104.18 ≤ v < 5.15.1494.18 ≤ v < 6.1.774.18 ≤ v < 6.6.164.18 ≤ v < 6.7.44.18 ≤ v < 6.85.11 ≤ v < 5.15.1495.16 ≤ v < 6.1.776.2 ≤ v < 6.6.166.7 ≤ v < 6.7.46.8 rc1 6.8 rc293ab6cc69162775201587cc9da00d5016dc890e2

Vendor states this is fixed in 1b8adcc0e2c584fec778add7777fe28e20781e60 (fixed)

Vendor states this is fixed in 577e4432f3ac810049cb7e6b71f4d96ec7c6e894 (fixed)

Vendor states this is fixed in 718f446e60316bf606946f7f42367d691d21541e (fixed)

Vendor states this is fixed in b383d4ea272fe5795877506dcce5aad1f6330e5e (fixed)

Vendor states this is fixed in d15cc0f66884ef2bed28c7ccbb11c102aa3a0760 (fixed)

Vendor states this is fixed in f48bf9a83b1666d934247cb58a9887d7b3127b6f (fixed)

Vendor states this is fixed in 4.18 (unaffected)

Vendor states this is fixed in 5.10.210 (unaffected)

Vendor states this is fixed in 5.15.149 (unaffected)

Vendor states this is fixed in 6.1.77 (unaffected)

Vendor states this is fixed in 6.6.16 (unaffected)

Vendor states this is fixed in 6.7.4 (unaffected)