7.8

CVE-2024-26640: tcp: add sanity checks to rx zerocopy

Modified
AliasesUBUNTU-CVE-2024-26640DEBIAN-CVE-2024-26640
Published 18-03-2024Last modified 05-08-2026

Vulnerability summary

CVE-2024-26640 is a high (CVSS 7.8) vulnerability in debian debian_linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 34 · Related 28
DLA-3842-1DSA-5681-1RHSA-2024:5065RHSA-2024:5101RHSA-2024:5102RHSA-2024:5255

Timeline

  1. 18-03-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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)

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu112 products
  • linux< 5.4.0-200.220 | < 5.15.0-106.116
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1135.145 | < 5.15.0-1061.67
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ 93ab6cc69162775201587cc9da00d5016dc890e2, < f48bf9a83b1666d934247cb58a9887d7b3127b6f | ≥ 93ab6cc69162775201587cc9da00d5016dc890e2, < 718f446e60316bf606946f7f42367d691d21541e | ≥ 93ab6cc69162775201587cc9da00d5016dc890e2, < b383d4ea272fe5795877506dcce5aad1f6330e5e | ≥ 93ab6cc69162775201587cc9da00d5016dc890e2, < d15cc0f66884ef2bed28c7ccbb11c102aa3a0760 | ≥ 93ab6cc69162775201587cc9da00d5016dc890e2, < 1b8adcc0e2c584fec778add7777fe28e20781e60 | ≥ 93ab6cc69162775201587cc9da00d5016dc890e2, < 577e4432f3ac810049cb7e6b71f4d96ec7c6e894 | 4.18
  • linux_kernel≥ 4.18, < 5.10.210 | ≥ 5.11, < 5.15.149 | ≥ 5.16, < 6.1.77 | ≥ 6.2, < 6.6.16 | ≥ 6.7, < 6.7.4 | 6.8:rc1 | 6.8:rc2

3 vendors · 116 products

References

30 links
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